GTS DURATEK INC
424B1, 1996-04-23
HELP SUPPLY SERVICES
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(1)
                                                              Reg. No. 333-01805
PROSPECTUS
APRIL 22, 1996
 
                                3,600,000 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
 
    Of the 3,600,000 shares of Common Stock offered hereby, 2,500,000 shares are
being  sold by  GTS Duratek, Inc.,  and 1,100,000  shares are being  sold by the
Selling Stockholders. The Company will not receive any of the proceeds from  the
sale  of  the shares  by the  Selling Stockholders.  See "Principal  and Selling
Stockholders."
 
    The Company's Common Stock is traded on the Nasdaq National Market under the
symbol "DRTK." On April 22, 1996, the reported last sale price as quoted on  the
Nasdaq  National  Market was  $19 3/16  per  share. See  "Price Range  of Common
Stock."
 
    SEE "RISK FACTORS" BEGINNING ON PAGE  6 OF THIS PROSPECTUS FOR A  DISCUSSION
OF  CERTAIN FACTORS  THAT SHOULD BE  CONSIDERED BY PROSPECTIVE  INVESTORS IN THE
COMMON STOCK.
 
THESE SECURITIES  HAVE  NOT  BEEN  APPROVED OR  DISAPPROVED  BY  THE  SECURITIES
 AND  EXCHANGE  COMMISSION  OR  ANY STATE  SECURITIES  COMMISSION  NOR  HAS THE
   SECURITIES AND  EXCHANGE COMMISSION  OR  ANY STATE  SECURITIES  COMMISSION
     PASSED   UPON   THE   ACCURACY  OR   ADEQUACY   OF   THIS  PROSPECTUS.
      ANY  REPRESENTATION  TO   THE  CONTRARY  IS   A  CRIMINAL   OFFENSE.
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------
                                       PRICE        UNDERWRITING       PROCEEDS        PROCEEDS TO
                                      TO THE        DISCOUNTS AND       TO THE         THE SELLING
                                      PUBLIC       COMMISSIONS (1)    COMPANY (2)     STOCKHOLDERS
- ----------------------------------------------------------------------------------------------------
<S>                               <C>              <C>              <C>              <C>
Per Share.......................      $18.50            $1.01           $17.49           $17.49
- ------------------------------------------------------------------------------------------------
Total (3).......................    $66,600,000      $3,636,000       $43,725,000      $19,239,000
- ------------------------------------------------------------------------------------------------
</TABLE>
 
(1) THE COMPANY HAS AGREED TO INDEMNIFY THE SEVERAL UNDERWRITERS AGAINST CERTAIN
    LIABILITIES,  INCLUDING  LIABILITIES UNDER  THE SECURITIES  ACT OF  1933, AS
    AMENDED. SEE "UNDERWRITING."
 
(2) BEFORE DEDUCTING EXPENSES PAYABLE BY THE COMPANY ESTIMATED AT $400,000.
 
(3) THE COMPANY HAS GRANTED TO THE UNDERWRITERS AN OPTION, EXERCISABLE WITHIN 30
    DAYS HEREOF, TO PURCHASE UP TO AN AGGREGATE OF 540,000 ADDITIONAL SHARES  OF
    COMMON  STOCK AT  THE PRICE  TO THE  PUBLIC LESS  UNDERWRITING DISCOUNTS AND
    COMMISSIONS FOR  THE PURPOSE  OF COVERING  OVER-ALLOTMENTS, IF  ANY. IF  THE
    UNDERWRITERS  EXERCISE SUCH OPTION  IN FULL, THE TOTAL  PRICE TO THE PUBLIC,
    UNDERWRITING DISCOUNTS AND COMMISSIONS, AND PROCEEDS TO THE COMPANY WILL  BE
    $76,590,000, $4,181,400, AND $53,169,600, RESPECTIVELY. SEE "UNDERWRITING."
 
    The  shares of Common Stock are being  offered, subject to prior sale, when,
as and if accepted by the Underwriters named herein and subject to various prior
conditions, including their right to  reject orders in whole  or in part. It  is
expected  that delivery of shares  will be made against  payment therefor in New
York, New York on or about April 26, 1996.
 
DONALDSON, LUFKIN & JENRETTE
      SECURITIES CORPORATION
                            DEUTSCHE MORGAN GRENFELL
                                                     GRUNTAL & CO., INCORPORATED
<PAGE>
GTS Duratek Vendor Treatment facility at
Savannah River's M-Area
 
Control Room of the Vendor Treatment Facility at Savannah
River's M-Area
 
Waste Removal by GTS Duratek technician
 
DuraMelter 5000-TM- located at Savannah River's M-Area
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE  COMPANY AT  A LEVEL ABOVE  THAT WHICH  MIGHT OTHERWISE PREVAIL  IN THE OPEN
MARKET. SUCH  TRANSACTIONS MAY  BE EFFECTED  ON THE  NASDAQ NATIONAL  MARKET  OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS AND CERTAIN SELLING GROUP
MEMBERS  MAY ENGAGE IN PASSIVE MARKET MAKING TRANSACTIONS IN THE COMMON STOCK OF
THE COMPANY ON THE NASDAQ NATIONAL  MARKET IN ACCORDANCE WITH RULE 10B-6A  UNDER
THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED. SEE "UNDERWRITING."
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION, INCLUDING "RISK FACTORS," AND CONSOLIDATED FINANCIAL STATEMENTS AND
NOTES  THERETO  APPEARING  ELSEWHERE  AND  INCORPORATED  BY  REFERENCE  IN  THIS
PROSPECTUS.  UNLESS  OTHERWISE  INDICATED, ALL  INFORMATION  IN  THIS PROSPECTUS
ASSUMES THAT THE UNDERWRITERS' OVER-ALLOTMENT OPTION IS NOT EXERCISED AND  GIVES
EFFECT  TO AN AMENDMENT TO THE CERTIFICATE OF INCORPORATION OF GTS DURATEK, INC.
TO INCREASE THE AUTHORIZED COMMON STOCK OF THE COMPANY, PAR VALUE $.01 PER SHARE
(THE "COMMON  STOCK"), FROM  20,000,000  SHARES TO  35,000,000 SHARES  THAT  WAS
APPROVED AT A SPECIAL MEETING OF STOCKHOLDERS HELD ON APRIL 16, 1996. UNLESS THE
CONTEXT  SUGGESTS OTHERWISE, REFERENCES  IN THIS PROSPECTUS  TO "GTS DURATEK" OR
THE "COMPANY" MEAN GTS DURATEK, INC. AND ITS SUBSIDIARIES.
 
                                  THE COMPANY
 
    GTS Duratek provides waste  treatment solutions for radioactive,  hazardous,
mixed  and other wastes. The  Company's strategy is (i)  to provide the low cost
solution to process contaminated waste streams, (ii) to combine its  proprietary
technologies  and  technical  support  services  to  provide  full-service waste
treatment, and  (iii) to  team,  where appropriate,  with other  companies  with
complementary  expertise to advance GTS Duratek's treatment solutions within its
target markets  and  into  new markets.  The  Company's  vitrification,  thermal
desorption  and  ion exchange  technologies convert  waste  to stable  forms for
storage or disposal while  achieving significant volume reduction.  Accordingly,
the  Company believes  its customers  benefit from  significant cost  savings as
compared to other  commercially-available alternatives. To  implement its  waste
treatment  technologies  and  provide related  technical  support  services, the
Company has a staff of  highly skilled personnel with significant  environmental
services experience.
 
    The  Company's  targeted markets  are the  former nuclear  weapon production
sites administered by the United States Department of Energy ("DOE"), commercial
radioactive waste generators and selected hazardous and other waste  generators.
In THE 1995 BASELINE ENVIRONMENTAL MANAGEMENT REPORT, the DOE estimates that the
cleanup  of the nuclear wastes at the  U.S. facilities under its management will
take at least 75 years  and cost $230 billion.  The Company estimates that  $400
million  per year will be spent worldwide  on storage and disposal of commercial
low-level radioactive  waste. The  Company  believes it  is well  positioned  to
compete  in these markets because it has processed or currently has contracts to
process waste at two DOE sites and two commercial waste sites.
 
    In serving these markets, the Company has achieved the following milestones:
(i) the first  to vitrify low-level  radioactive waste at  a DOE site  (Fernald,
Ohio);   (ii)  the  award   and  construction  of   the  first  commercial-scale
vitrification project for low-level  radioactive waste at  a DOE site  (Savannah
River  M-Area Project);  (iii) the  successful conversion  of commercial nuclear
power  plant  radioactive   waste  into   glass  and  the   construction  of   a
commercial-scale  vitrification facility  in Barnwell, South  Carolina; and (iv)
the selection to design  and build a  vitrification system for  radon-containing
sludge at the DOE's K-65 silos at Fernald, Ohio.
 
    The  Company's waste  treatment technologies  include vitrification, thermal
desorption and ion exchange and can be used independently or in tandem to  solve
the  waste  disposal  or  storage  problems  of  its  customers.  The  Company's
vitrification   technology   converts    waste   to   environmentally    stable,
leach-resistant  glass through a patented  high-temperature melter system, known
as a DuraMelter-TM-. The  thermal desorption and  ion exchange technologies  are
used by the Company to treat petrochemical and liquid radioactive waste streams,
respectively, and can be used to separate the waste streams into components that
can  either be safely stored, recycled or used as additives in the vitrification
of other waste streams. The Company's  ability to integrate its waste  treatment
technologies  enables  it to  handle a  diversity  of waste  streams in  a cost-
effective manner.
 
    The Company has over 450 engineers, consultants and technicians who  support
and  complement its waste treatment services and also provide highly specialized
technical support services  for the Company's  customers. The technical  support
services  provide a consistent source of revenue and the complementary expertise
for the Company to  expand and diversify its  waste treatment technologies.  The
services  provided by the Company include staff augmentation and outage support,
principally to assist nuclear power plants during regular maintenance shutdowns,
environmental and computer consulting and environmental safety
 
                                       3
<PAGE>
training. Having these technical resources available has enabled the Company  to
move  its technologies from  bench-scale laboratory testing  to field operations
and commercial application more rapidly and to handle larger scope waste cleanup
projects.
 
    The  Company  has  developed  the  following  important  joint  venture  and
collaborative  arrangements  in order  to advance  the commercialization  of its
waste treatment technologies and increase the number of markets that it serves:
 
    - THE VITREOUS STATE  LABORATORY OF  THE CATHOLIC UNIVERSITY  OF AMERICA  IN
      WASHINGTON,  D.C.  ("VSL"). The  Company has  an established  research and
      development relationship with the VSL, one of the leading research centers
      in the world for glass technology, including vitrification of waste.
 
    - CHEM-NUCLEAR  SYSTEMS,  INC.  ("Chem-Nuclear").  In  September  1994,  the
      Company established a joint venture with Chem-Nuclear, a subsidiary of WMX
      Technologies,  Inc.,  to  jointly  pursue the  treatment  and  disposal of
      commercial low-level radioactive waste generated by nuclear power  plants,
      hospitals,  research  laboratories  and industrial  facilities.  The joint
      venture  combines  the   Company's  DOE   vitrification  experience   with
      Chem-Nuclear's  22  years  of experience  in  providing  radioactive waste
      services.
 
    - BNFL INC.  ("BNFL"). In  November  1995, the  Company formed  a  strategic
      alliance  with BNFL to jointly pursue up to five major DOE waste treatment
      projects. BNFL is the U.S. subsidiary of British Nuclear Fuels plc, one of
      the largest  processors of  radioactive waste  in the  world. The  Company
      believes  the strategic  alliance significantly enhances  its prospects of
      being awarded  major  DOE cleanup  projects  and opens  opportunities  for
      international expansion.
 
    - THE  CARLYLE GROUP  ("Carlyle"). In  January 1995,  Carlyle, a Washington,
      D.C.-based private merchant  bank, made  a significant  investment in  the
      Company.  Carlyle provided the  Company with strong  financial support and
      experience with companies that contract with the federal government.
 
The Company seeks to utilize the complementary technical expertise or commercial
experience of the other parties  in these collaborative arrangements and,  where
possible,  to  develop  additional  collaborative  arrangements,  to  pursue its
primary markets and expand into new markets.
 
    The Company was incorporated  in Delaware in  1982. Its principal  executive
office is located at 8955 Guilford Road, Suite 200, Columbia, Maryland 21046 and
its telephone number is (410) 312-5100.
 
                                  THE OFFERING
 
<TABLE>
<S>                                         <C>              <C>
Common Stock Offered:
  By the Company..........................  2,500,000
                                            shares
  By the Selling Stockholders.............  1,100,000
                                            shares
                                            ---------------
    Total.................................  3,600,000
                                            shares
 
Common Stock to be outstanding
 after the offering.......................  12,080,870 shares (1)
 
Use of proceeds...........................  To expand waste treatment technology operations,
                                            including for working capital, funding of waste
                                            treatment technology projects and research and
                                            development, and for possible acquisitions. See
                                            "Use of Proceeds."
 
Nasdaq National Market Symbol.............  DRTK
</TABLE>
 
- ------------------------
(1) Based on number of shares outstanding as of April 19, 1996. Does not include
    9,798,756  shares  that may  be issued  upon  the conversion  of convertible
    securities or upon the  exercise of options and  warrants outstanding as  of
    such  date. See Notes 10,  11 and 12 of  Notes to the Consolidated Financial
    Statements.
 
                                       4
<PAGE>
                         SUMMARY FINANCIAL INFORMATION
 
<TABLE>
<CAPTION>
                                                                               YEARS ENDED DECEMBER 31,
                                                                 -----------------------------------------------------
                                                                   1991       1992       1993       1994       1995
                                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                              <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
  Revenues.....................................................  $  32,820  $  38,772  $  33,505  $  35,968  $  40,418
  Cost of revenues.............................................     27,583     32,674     28,609     28,857     32,220
                                                                 ---------  ---------  ---------  ---------  ---------
  Gross profit.................................................      5,237      6,098      4,896      7,111      8,198
  Selling, general and administrative expenses.................      6,280      5,616      5,738      5,926      5,876
                                                                 ---------  ---------  ---------  ---------  ---------
  Income (loss) from operations................................     (1,043)       482       (842)     1,185      2,322
  Interest income (expense), net...............................       (517)      (406)      (372)      (595)        57
                                                                 ---------  ---------  ---------  ---------  ---------
  Income (loss) before income taxes and proportionate share of
   loss of joint venture.......................................     (1,560)        76     (1,214)       590      2,379
  Income taxes.................................................         --        (50)       (73)       (12)      (101)
                                                                 ---------  ---------  ---------  ---------  ---------
  Income (loss) before proportionate share of loss of joint
   venture.....................................................     (1,560)        26     (1,287)       578      2,278
  Proportionate share of loss of joint venture.................         --         --         --       (321)      (824)
                                                                 ---------  ---------  ---------  ---------  ---------
  Net income (loss)............................................     (1,560)        26     (1,287)       257      1,454
  Preferred stock dividends and charges for accretion..........         --         --         --         --     (1,394)
                                                                 ---------  ---------  ---------  ---------  ---------
  Net income (loss) attributable to common stockholders........  $  (1,560) $      26  $  (1,287) $     257  $      60
                                                                 ---------  ---------  ---------  ---------  ---------
                                                                 ---------  ---------  ---------  ---------  ---------
  Net income (loss) per share..................................  $   (0.21) $    0.00  $   (0.16) $    0.03  $    0.01
  Weighted average common shares outstanding...................      7,360      7,388      7,936      8,656      8,820
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                          AS OF DECEMBER 31, 1995
                                                                                         -------------------------
                                                                                          ACTUAL    AS ADJUSTED(1)
<S>                                                                                      <C>        <C>
BALANCE SHEET DATA:
  Working capital......................................................................  $  24,114    $   67,439
  Total assets.........................................................................     38,660        81,985
  Long-term debt and convertible debenture.............................................     10,123        10,123
  Redeemable convertible preferred stock...............................................     14,609        14,609
  Stockholders' equity.................................................................      9,257        52,582
</TABLE>
 
- ------------------------
(1) Adjusted to reflect  the sale  of 2,500,000 shares  of Common  Stock by  the
    Company hereby. See "Use of Proceeds."
 
                                       5
<PAGE>
                                  RISK FACTORS
 
    PROSPECTIVE  PURCHASERS OF THE SHARES OF  COMMON STOCK OFFERED HEREBY SHOULD
CONSIDER CAREFULLY THE  SPECIFIC FACTORS SET  FORTH BELOW AS  WELL AS THE  OTHER
INFORMATION  CONTAINED IN  THIS PROSPECTUS  IN EVALUATING  AN INVESTMENT  IN THE
COMMON STOCK.
 
NO ASSURANCE OF SUCCESSFUL DEVELOPMENT OR ACCEPTANCE OF TECHNOLOGIES
 
    The Company is in the process  of developing, refining and implementing  its
technologies   for  the  treatment  of   radioactive,  hazardous,  mixed  (i.e.,
intermingled radioactive and hazardous) and  other wastes. The Company's  growth
prospects  are significantly dependent upon the acceptance and implementation of
these technologies,  particularly  vitrification  and  thermal  desorption.  The
awarding  of  any  future  contracts to  implement  the  Company's vitrification
technology is  substantially dependent  upon the  continuing evaluation  of  the
Company's  technology  versus several  other competing  technologies as  well as
conventional storage and disposal alternatives.  There can be no assurance  that
the  Company's  vitrification  and  related  technologies  will  prove  to  be a
commercially viable and cost-effective means of waste treatment or that, even if
effective, the Company's technologies will be  selected for use in future  waste
treatment  projects. In addition, applications  of the Company's waste treatment
technologies to hazardous and other wastes are in various stages of development.
Accordingly, there can be  no assurance that  development of these  technologies
will  be completed in  the near future,  or that even  if developed, the Company
will be able to commercialize such technologies.
 
DEPENDENCE ON PROPRIETARY TECHNOLOGY AND INTELLECTUAL PROPERTY
 
    The  Company's   success  is   heavily   dependent  upon   its   proprietary
vitrification  and other waste treatment technologies.  The Company does not own
any of the patents to the  vitrification and other waste treatment  technologies
but  exclusively licenses  such rights from  the inventors  of the technologies.
There can  be no  assurance concerning  the  scope, validity  or value  of  such
patents  or  related  intellectual property  rights.  Further, there  can  be no
assurance that the steps taken by the Company and the inventors to protect these
proprietary technologies will be adequate  to prevent misappropriation of  these
technologies  by  third parties.  Any such  adverse  circumstances could  have a
material adverse effect on the Company. Many technology fields are characterized
by the  existence of  a large  number  of patents  and frequent  litigation  for
financial  gain. Although  the Company does  not believe any  of its proprietary
technologies infringe  the patent  rights  of third  parties,  there can  be  no
assurance  that infringement claims will not  be asserted against the Company in
the future or that any  such claims will not require  the Company to enter  into
royalty  arrangements or  result in  litigation. In  the event  that the Company
pursues overseas projects,  there can be  no assurance that  steps taken by  the
Company  and the  inventors to  protect their  proprietary technologies  will be
adequate under the laws of certain  foreign countries. See "Business --  Patents
and Other Intellectual Property Rights."
 
DEPENDENCE ON KEY CUSTOMERS
 
    During  1995,  the Company's  revenues  from waste  treatment  projects were
primarily derived from subcontracts with DOE contractors and subcontractors  and
constituted  approximately 87.9% of the  Company's revenues from waste treatment
projects and  24.2% of  the Company's  total revenues.  Revenues from  providing
technical  support  services constituted  approximately  72.4% of  the Company's
total revenues in 1995. Revenues from Duke Power Company, Westinghouse  Savannah
River  Company ("WSRC") and Fernald Environmental Restoration Management Company
("FERMCO"), a  subsidiary  of  Fluor Corporation,  accounted  for  approximately
22.6%,  17.4% and 16.1%  of the Company's total  revenues in 1995, respectively.
The loss of  business from  any of  its major  customers could  have a  material
adverse effect on the Company.
 
GOVERNMENT FUNDING AND CONTRACTING
 
    The  Company believes  that demand for  its waste  treatment technologies is
directly related to the response  of governmental authorities to public  concern
over  the  treatment and  disposal of  radioactive,  hazardous, mixed  and other
wastes. The lessening of  public concern in  this area or  other changes in  the
political  environment could result  in a corresponding  reduction in demand for
the services offered by the
 
                                       6
<PAGE>
Company. Additionally,  efforts  to  reduce the  federal  budget  deficit  could
adversely  affect  the availability  and timing  of  government funding  for the
cleanup of  DOE  and other  sites  at which  radioactive  and mixed  wastes  are
present.
 
    The  Company's existing  government subcontracts can  generally be canceled,
delayed or modified at the sole  option of the government. The Company  believes
that  any  future  government  contracts  and  subcontracts  will  be structured
similarly. In  addition, under  the  terms of  future government  contracts  and
subcontracts,  if any,  the federal  government may be  in a  position to obtain
greater rights  with respect  to the  Company's intellectual  property than  the
Company would grant to other entities. As a result of engaging in the government
contracting  business, the Company has  been and will be  subject to audits, and
may be subject  to investigation,  by government  agencies. The  failure by  the
Company  to  comply  with the  terms  of  any of  its  government  contracts and
subcontracts could result in substantial civil and criminal fines and  penalties
or  the Company's suspension  or debarment from  future government contracts and
subcontracts for a  significant period  of time.  The fines  and penalties  that
could  result from noncompliance with  appropriate standards and regulations, or
the Company's suspension or debarment, could  have a material adverse effect  on
the Company.
 
DEPENDENCE ON COLLABORATIVE RELATIONSHIPS
 
    In  order  to  commercialize  its vitrification  and  other  waste treatment
technologies, the  Company  has developed  several  collaborative  arrangements,
including  arrangements with the  VSL, Chem-Nuclear and BNFL,  and in the future
may seek other  collaborative arrangements.  The Company's  future success  will
likely   depend,  in  part,  on  the   success  of  its  existing  collaborative
relationships. Collaborative arrangements involve  risks that the  participating
parties may disagree on business decisions and strategies resulting in potential
delays,  additional costs and risks of  litigation. The inability of the Company
to successfully maintain existing collaborative relationships or enter into  new
collaborative  arrangements could have a material adverse effect on the Company.
See "Business -- Joint Venture and Collaborative Arrangements."
 
ACCUMULATED DEFICIT
 
    As of December  31, 1995,  the Company had  an accumulated  deficit of  $9.6
million resulting principally from losses generated by operations prior to 1994,
certain  of which related to a line  of business discontinued in 1990. There can
be no  assurance  that in  the  future the  Company  will be  able  to  generate
sufficient  revenues  or  control operating  expenses  in order  to  achieve and
sustain  profitability.   See  "Selected   Consolidated  Financial   Data"   and
"Management's  Discussion and  Analysis of  Results of  Operations and Financial
Condition -- Results of Operations."
 
MANAGEMENT OF GROWTH
 
    The Company is currently experiencing a period of rapid growth, attributable
in large part  to the expansion  of its waste  treatment technology  operations.
This  growth has placed and could continue  to place a significant strain on the
Company's management personnel and other resources. The Company's recent growth,
which  might  accelerate  in  the  event  the  Company  establishes   additional
collaborative  arrangements  or  joint  ventures  or  undertakes  a  significant
acquisition, has  resulted  in an  increased  level of  responsibility  for  the
Company's   management  personnel.  The  Company's   ability  to  manage  growth
effectively will require  the Company  to effectively  manage its  collaborative
arrangements  and  to  continue  to  improve  its  operational,  management  and
financial systems and controls  and to successfully  train, motivate and  manage
its   employees.  If  the  Company's  management  is  unable  to  manage  growth
effectively, the Company's results of  operations could be materially  adversely
affected.
 
    The  Company's business strategy includes  the expansion of its technologies
and services,  which  may be  effected  through acquisitions.  While  there  are
currently  no commitments with  respect to any  future acquisitions, the Company
frequently reviews various acquisition  prospects of businesses or  technologies
complementary  to the Company's business and periodically engages in discussions
regarding such  possible  acquisitions  or  affiliations.  Acquisitions  involve
numerous  management, financial,  operational and financial  market risks. There
can be no assurance  that any acquisition will  result in long-term benefits  to
the  Company or that the Company's management will be able to manage effectively
the resulting businesses.
 
                                       7
<PAGE>
COMPETITION
 
    The market for the Company's  waste treatment technologies is  characterized
by  several large companies and numerous  small companies. Any of such companies
may possess  or  develop technologies  superior  to  those of  the  Company.  In
addition,  the Company competes with companies offering conventional storage and
disposal alternatives such  as special landfills,  deep-well injection,  on-site
containment in tanks, pits or ponds and incineration and other thermal treatment
methods.  In its technical support  services business, the Company's competitors
range from  major national  and regional  environmental service  and  consulting
firms  with large environmental remediation staffs to small local firms. Many of
the Company's  competitors  have  greater financial,  management  and  marketing
resources   than  the  Company.  To  the  extent  that  competitors  offer  more
cost-effective waste  treatment alternatives  or  offer comparable  services  at
lower  prices, the Company's  ability to compete  effectively could be adversely
affected. See "Business -- Competition."
 
DEPENDENCE ON KEY PERSONNEL
 
    The Company is highly dependent upon the technical expertise and  management
experience  of  Robert  E.  Prince, President,  Chief  Executive  Officer  and a
director of the  Company. The  Company's operations  are also  dependent on  the
continued  efforts of certain  technical personnel which  include certain of the
Company's senior management as well as  certain individuals at the VSL who  have
developed  and are  continuing to refine  the proprietary  vitrification and ion
exchange technologies licensed by the Company.  The loss of the services of  any
of  these individuals could have  a material adverse effect  on the Company. Mr.
Prince and certain other members of senior management are subject to  employment
agreements  which terminate in January 1998, unless extended; however, there are
no "key man" life insurance policies on Mr. Prince, any other members of  senior
management or any other personnel.
 
GOVERNMENT REGULATION
 
    Federal,  state and local environmental  legislation and regulations require
substantial expenditures and impose liabilities for noncompliance. Environmental
laws and regulations are, and will continue to be, a principal factor  affecting
demand  for  the  services offered  by  the  Company. The  level  of enforcement
activities by federal,  state and  local environmental  protection agencies  and
changes  in regulations will also affect demand.  In the event and to the extent
that the burden  of complying  with environmental  laws and  regulations may  be
eased,  particularly those relating to the transportation, treatment, storage or
disposal of radioactive, hazardous,  mixed or other wastes,  the demand for  the
Company's services could be materially adversely affected.
 
    The  Company and  its customers operate  in a  highly regulated environment.
Facilities utilizing the  Company's technologies are  required to have  federal,
state  and local  governmental permits  and approvals.  Any of  these permits or
approvals may be  subject to  denial, revocation or  modification under  various
circumstances.  Failure to  obtain or comply  with the conditions  of permits or
approvals may adversely affect the operations of the Company and may subject the
Company  to  penalties.  In  addition,  if  new  environmental  legislation   or
regulations  are enacted or  existing legislation or  regulations are amended or
are interpreted or  enforced differently, the  Company or its  customers may  be
required  to obtain  additional operating permits  or approvals.  Any changes in
these regulations which increase compliance standards may require the Company to
change or  improve  its waste  treatment  technologies to  meet  more  stringent
regulatory  requirements. There can  be no assurance that  the Company will meet
all of the  applicable regulatory requirements.  See "Business --  Environmental
Matters."
 
POTENTIAL ENVIRONMENTAL LIABILITY AND INSURANCE
 
    Performance  of the  Company's services  requires exposure  of personnel and
equipment to radioactive  and hazardous materials  and conditions. Although  the
Company  is committed to a policy of operating safely and prudently, the Company
may be subject to liability claims by employees, customers and third parties. In
addition, the Company may  be subject to fines,  penalties or other  liabilities
arising  from its actions  imposed under environmental or  safety laws. To date,
the Company has been able to obtain liability insurance for the operation of its
business. However,  there  can  be  no assurance  that  the  Company's  existing
liability insurance
 
                                       8
<PAGE>
is adequate or that it will be able to be maintained or that all possible claims
that  may  be asserted  against  the Company  will  be covered  by  insurance. A
partially or  completely  uninsured  claim,  if  successful  and  of  sufficient
magnitude, could have a material adverse effect on the Company.
 
FLUCTUATIONS IN QUARTERLY RESULTS
 
    A  large component of  the Company's technical  support services business is
outage support for  nuclear power plants.  As a result,  the Company's  revenues
have  historically been subject to  significant quarterly fluctuations, affected
primarily by the timing of outage support projects at its customers' facilities,
which typically occur in the spring and  fall when electrical load demand is  at
its  lowest. In addition, the timing  of new waste treatment projects, including
those pursued jointly with BNFL, the duration of these projects and the form  in
which  these  projects  are  owned  and  operated  will  affect period-to-period
comparisons of the Company's operating results.
 
CONTROL BY PRINCIPAL STOCKHOLDERS
 
    Carlyle will own  approximately 16.9%  of the outstanding  Common Stock  and
94.2%  of  the outstanding  shares of  the  Company's 8%  Cumulative Convertible
Redeemable Preferred Stock (the "Convertible Preferred Stock"), or an  aggregate
of  40.6%  of  the  outstanding  voting securities  of  the  Company  after this
offering. In addition, Carlyle  has the option to  purchase from the Company  an
additional 1,177,278 shares of the Common Stock at any time prior to January 24,
1999  for $3.75 per share. The terms  of the Convertible Preferred Stock provide
that the holders thereof, voting as a separate class, have the right to elect  a
majority  of the Company's Board of Directors  so long as Carlyle owns shares of
capital stock having  20% or more  of the votes  that may be  cast at annual  or
special  meetings of stockholders.  The remaining directors  shall be elected by
the vote of  the holders of  the Common Stock  and Convertible Preferred  Stock,
voting  together as a single class. Carlyle, through its beneficial ownership of
the Convertible Preferred  Stock, has  the unilateral  voting power  to elect  a
majority  of the Company's Board of Directors  and has ultimate control over the
management and  policies of  the Company  through its  control of  the Board  of
Directors.  In  addition, Carlyle  and  National Patent  Development Corporation
("National Patent"), which will be  the beneficial owner of approximately  15.3%
of  the outstanding Common Stock after completion of this offering, have entered
into a stockholders agreement in which each  agreed to vote the shares of  stock
beneficially  owned  by  them so  that  a  majority of  the  Company's  Board of
Directors will  be  comprised  of  the  Carlyle  designees,  and  the  remaining
directors  will be  the Company's  president and  designees of  National Patent.
Accordingly, if Carlyle and National  Patent vote the shares beneficially  owned
by  them  in  accordance  with  the  terms  of  the  stockholders  agreement, no
additional votes are  required to elect  the Company's Board  of Directors.  See
"Principal and Selling Stockholders" and "Description of Capital Stock."
 
EFFECT OF CERTAIN OUTSTANDING SECURITIES
 
    At April 19, 1996, the Company had reserved 9,798,756 shares of Common Stock
for  issuance upon conversion or exercise of the Convertible Preferred Stock and
options issued to Carlyle in 1995,  the convertible debenture issued to BNFL  in
1995,  and options and warrants issued to  employees and others. The exercise or
conversion prices of these securities are substantially below the current market
price for the  Company's Common Stock.  Investors may experience  dilution as  a
result  of shares of  Common Stock being  issued upon conversion  or exercise of
these securities. In  addition, the Company's  income per common  share will  be
significantly  affected by their future conversion  or exercise or at such time,
if ever, as the  level of the Company's  net income causes any  or all of  these
securities to be included in earnings per share computations. See "Principal and
Selling  Stockholders,"  "Description  of  Capital  Stock,"  and  Notes  to  the
Consolidated Financial Statements.
 
AVAILABILITY OF SKILLED PROFESSIONALS
 
    The Company's  success  in  providing  technical  support  services  to  its
customers  is dependent upon its ability to staff customer projects with skilled
technical specialists and experts  in a wide  range of scientific,  engineering,
health  and safety, data processing  and communications disciplines. The Company
does not  retain  all  such  skilled professionals  on  a  full-time  basis  but
contracts with these individuals on an as-needed
 
                                       9
<PAGE>
basis.  The  market for  skilled professionals  in  these disciplines  is highly
competitive and there can be no assurance that the Company will be able to  hire
these  professionals when needed to staff customer  projects or that the cost of
such labor will not significantly increase.
 
VOLATILITY OF STOCK PRICE
 
    There has been a history of  volatility in the market prices for  securities
of  technology and other emerging growth companies.  In the case of the Company,
factors  such  as   the  announcements   of  new   contracts  or   technological
developments,  status  of  collaborative  arrangements  of  the  Company  or its
competitors,  government  regulatory  action,   patent  or  proprietary   rights
developments,  changes in recommendations and estimates by security analysts and
market conditions  in general  could have  a significant  impact on  the  future
market price of the Common Stock. See "Price Range of Common Stock."
 
                                       10
<PAGE>
                                USE OF PROCEEDS
 
    The  net proceeds to the Company from the sale of the shares of Common Stock
offered by  the  Company  hereby  will be  approximately  $43.3  million,  after
deducting  the estimated  underwriting discounts  and commissions  and estimated
offering expenses ($52.8 million if  the Underwriters' over-allotment option  is
exercised  in full). The Company  intends to use the  net proceeds to expand its
waste treatment technology operations, including for working capital, funding of
waste treatment technology projects, and research and development . The  Company
may  use a  portion of  the net  proceeds for  the acquisition  of businesses or
technologies  complementary  to  the   Company's  business,  although  no   such
acquisition  is being negotiated or  planned as of the  date of this Prospectus.
Pending such uses, the net proceeds  are expected to be invested in  short-term,
investment grade securities.
 
    The  Company will not receive any proceeds from the sale of shares of Common
Stock by the Selling Stockholders. See "Principal and Selling Stockholders."
 
                          PRICE RANGE OF COMMON STOCK
 
    The Common Stock is  quoted on the Nasdaq  National Market under the  symbol
DRTK.  The following table sets  forth, for the periods  indicated, the high and
low sale prices of  the Common Stock  (bid prices prior  to September 19,  1994,
when  the Common  Stock commenced  trading on  the Nasdaq  National Market). The
reported last sale price of  the Common Stock on  the Nasdaq National Market  on
April 22, 1996 was $19 3/16.
 
<TABLE>
<CAPTION>
                         PRICE RANGE
                       OF COMMON STOCK
                     --------------------
                       HIGH         LOW
<S>                  <C>          <C>
Year Ended December
 31, 1994:
1st Quarter......... $  5         $ 4 1/4
2nd Quarter.........    4 1/2       3 5/8
3rd Quarter.........    4 1/2       2 3/4
4th Quarter.........    4 3/8       3
Year Ended December
 31, 1995:
1st Quarter......... $  5         $ 3 5/8
2nd Quarter.........    6 1/8       4 1/4
3rd Quarter.........    6 1/4       5 3/8
4th Quarter.........   17 7/8       5 1/2
Year Ended December
 31, 1996:
1st Quarter......... $ 17 7/8     $11 1/4
2nd Quarter through
 April 22, 1996.....   19 7/8      15 7/8
</TABLE>
 
    As  of February  22, 1996, there  were 678  holders of record  of the Common
Stock and the Company estimates  that there were approximately 1,700  beneficial
holders.
 
                                DIVIDEND POLICY
 
    The  Company has never declared or paid  a cash dividend on its Common Stock
and is currently prohibited  from paying dividends under  its revolving line  of
credit  with  its  principal  lender.  The Company  will  pay  dividends  on the
Convertible  Preferred  Stock  out  of  funds  legally  available  therefor   in
accordance  with the terms of the  Convertible Preferred Stock which require the
payment of quarterly dividends of $320,000  or $2.00 per share. The Company  may
not  pay dividends on  any of the Common  Stock unless the  Company has paid all
accumulated dividends on all of the outstanding shares of Convertible  Preferred
Stock.  To date, the  Company has paid  all dividends on  all of the outstanding
shares of the Convertible Preferred Stock. Except with respect to the  dividends
on  the Convertible  Preferred Stock,  the Company  currently intends  to retain
earnings primarily  for  working  capital and  development  of  waste  treatment
technologies  and therefore does not anticipate paying any cash dividends in the
foreseeable future.  See "Management's  Discussion and  Analysis of  Results  of
Operations and Financial Condition -- Liquidity and Capital Resources."
 
                                       11
<PAGE>
                                 CAPITALIZATION
 
    The  following table sets forth the short-term debt and total capitalization
of the Company as of December 31, 1995 and as adjusted to reflect the  2,500,000
shares  of Common Stock offered by the Company hereby pursuant to this offering.
See "Use of Proceeds."
<TABLE>
<CAPTION>
                                                                                            AS OF DECEMBER 31,
                                                                                                   1995
                                                                                          ----------------------
<S>                                                                                       <C>        <C>
                                                                                              (IN THOUSANDS)
 
<CAPTION>
                                                                                           ACTUAL    AS ADJUSTED
<S>                                                                                       <C>        <C>
Current maturities of long-term debt....................................................  $     471   $     471
                                                                                          ---------  -----------
                                                                                          ---------  -----------
Long-term debt..........................................................................  $      36   $      36
                                                                                          ---------  -----------
Convertible debenture...................................................................     10,087      10,087
                                                                                          ---------  -----------
8% Cumulative Convertible Redeemable Preferred Stock - $.01 par value; 160,000 shares
 authorized, issued and outstanding (liquidation value $16,320,000).....................     14,609      14,609
                                                                                          ---------  -----------
Stockholders' equity:
  Preferred Stock - $.01 par value; authorized 4,840,000 shares; none issued............         --          --
  Common Stock - $.01 par value, authorized 35,000,000 shares; 9,475,878 shares issued;
   11,975,878 shares issued, as adjusted (1)............................................         95         120
Capital in excess of par value..........................................................     18,913      62,213
Deficit.................................................................................     (9,579)     (9,579)
Treasury stock, 70,458 shares, at cost..................................................       (172)       (172)
                                                                                          ---------  -----------
      Total stockholders' equity........................................................      9,257      52,582
                                                                                          ---------  -----------
      Total capitalization..............................................................  $  33,989   $  77,314
                                                                                          ---------  -----------
                                                                                          ---------  -----------
</TABLE>
 
- ------------------------
(1) At December 31, 1995,  the Company had reserved  9,909,706 shares of  Common
    Stock  for issuance upon conversion or exercise of the Convertible Preferred
    Stock and  options issued  to  Carlyle in  1995, the  convertible  debenture
    issued  to BNFL in  1995, and options  and warrants issued  to employees and
    others. The Company's Board of  Directors recently approved an amendment  to
    the  Company's stock option plan to increase the maximum number of shares of
    Common Stock which may be purchased  pursuant to options granted under  such
    plan from 1,800,000 to 2,800,000 shares. See Notes 10, 11 and 12 of Notes to
    the Consolidated Financial Statements.
 
                                       12
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
    The  selected consolidated financial data presented below for, and as of and
for each of the years in the five-year period ended December 31, 1995, have been
derived from the consolidated  financial statements of  the Company, which  have
been audited by KPMG Peat Marwick LLP, independent certified public accountants.
This  selected consolidated  financial data should  be read  in conjunction with
"Management's Discussion and  Analysis of  Results of  Operations and  Financial
Condition"  and with  the Company's Consolidated  Financial Statements including
notes thereto.
<TABLE>
<CAPTION>
                                                                               YEARS ENDED DECEMBER 31,
                                                                 -----------------------------------------------------
                                                                   1991       1992       1993       1994       1995
                                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                              <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
  Revenues.....................................................  $  32,820  $  38,772  $  33,505  $  35,968  $  40,418
  Cost of revenues.............................................     27,583     32,674     28,609     28,857     32,220
                                                                 ---------  ---------  ---------  ---------  ---------
  Gross profit.................................................      5,237      6,098      4,896      7,111      8,198
  Selling, general and administrative expenses.................      6,280      5,616      5,738      5,926      5,876
                                                                 ---------  ---------  ---------  ---------  ---------
  Income (loss) from operations................................     (1,043)       482       (842)     1,185      2,322
  Interest income (expense), net...............................       (517)      (406)      (372)      (595)        57
                                                                 ---------  ---------  ---------  ---------  ---------
  Income (loss) before income taxes and proportionate share of
   loss of joint venture.......................................     (1,560)        76     (1,214)       590      2,379
  Income taxes.................................................         --        (50)       (73)       (12)      (101)
                                                                 ---------  ---------  ---------  ---------  ---------
  Income (loss) before proportionate share of loss of joint
   venture.....................................................     (1,560)        26     (1,287)       578      2,278
  Proportionate share of loss of joint venture.................         --         --         --       (321)      (824)
                                                                 ---------  ---------  ---------  ---------  ---------
  Net income (loss)............................................     (1,560)        26     (1,287)       257      1,454
  Preferred stock dividends and charges for accretion..........         --         --         --         --     (1,394)
                                                                 ---------  ---------  ---------  ---------  ---------
  Net income (loss) attributable to common stockholders........  $  (1,560) $      26  $  (1,287) $     257  $      60
                                                                 ---------  ---------  ---------  ---------  ---------
                                                                 ---------  ---------  ---------  ---------  ---------
  Net income (loss) per share..................................  $   (0.21) $    0.00  $   (0.16) $    0.03  $    0.01
  Weighted average common shares outstanding...................      7,360      7,388      7,936      8,656      8,820
 
<CAPTION>
 
                                                                                  AS OF DECEMBER 31,
                                                                 -----------------------------------------------------
                                                                   1991       1992       1993       1994       1995
<S>                                                              <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
  Working capital (deficit)....................................  $     916  $   1,265  $    (127) $     (78) $  24,114
  Total assets.................................................      9,350     13,127     12,754     19,200     38,660
  Long-term debt and convertible debenture.....................      1,418        123        288        502     10,123
  Redeemable convertible preferred stock.......................         --         --         --         --     14,609
  Stockholders' equity.........................................      2,796      4,529      6,159      6,933      9,257
</TABLE>
 
                                       13
<PAGE>
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF RESULTS OF OPERATIONS AND FINANCIAL CONDITION
 
OVERVIEW
 
    GTS  Duratek has historically derived substantially all of its revenues from
technical  support  services   to  government   agencies,  electric   utilities,
industrial  facilities and commercial businesses. Technical support services are
generally provided pursuant to multi-year time-and-materials contracts. Revenues
are recognized  as costs  are  incurred according  to predetermined  rates.  The
contract  costs primarily include direct labor, materials and the indirect costs
related to contract performance.
 
    Historically, the  Company's waste  treatment revenues  have been  generated
from  projects in which the Company acts as a subcontractor for the DOE pursuant
to fixed-price and  cost-plus-fixed-fee contracts.  The Company  began to  offer
vitrification   services  for  wastes  from   the  DOE's  Fernald  Environmental
Management  Project  in  1991  and  began  to  operate  its  first   field-based
DuraMelter-TM-  at Fernald  in 1993.  Substantially all  of the  Company's waste
treatment revenues during 1993  and 1994 were derived  from the Fernald  project
and  during  1995 were  derived from  the DOE's  Savannah River  M-Area project.
Revenues from  these projects  are  recognized on  the  percentage-of-completion
method  as  costs  are incurred  as  measured  by the  cost-to-cost  method. See
"Business -- Status of Current and Potential Waste Treatment Projects" and  Note
2 of Notes to Consolidated Financial Statements.
 
    The  Company to  date has  generated minimal  revenues from  waste treatment
projects for commercial  customers. Revenues from  the operations of  commercial
waste  treatment  facilities  will  be recognized  as  waste  is  processed. The
Company's current commercial  waste treatment  projects are  the DuraChem  joint
venture  with Chem-Nuclear ("DuraChem") and DuraTherm, Inc. ("DuraTherm"), which
owns the San Leon,  Texas thermal desorption facility.  Income or loss from  the
Company's  45%  share in  the DuraChem  joint  venture will  be recorded  by the
Company on  the equity  method.  DuraTherm is  expected to  commence  commercial
operations  in the second quarter of  1996. The Company consolidates the results
of DuraTherm  adjusting for  the  20% minority  interest in  consolidation.  The
timing  of new  waste treatment projects,  including those  pursued jointly with
BNFL, the duration of these projects, and  the form in which these projects  are
owned  and operated  will affect  period-to-period comparisons  of the Company's
operating results.  See  "Business --  Status  of Current  and  Potential  Waste
Treatment Projects."
 
    Pursuant  to the  terms of the  Company's strategic alliance  with BNFL, the
Company will receive  a $1.0 million  teaming fee  each time that  BNFL and  the
Company  agree to jointly  pursue a major  DOE waste treatment  project, up to a
maximum of five projects. The Company reached agreements to pursue the first two
projects in November 1995 and February  1996 and recognized as revenue the  $1.0
million  fees  in the  fourth quarter  of 1995  and the  first quarter  of 1996,
respectively. The Company  is unable  to predict  the timing  of recognition  of
future  teaming fees, if  any. In addition,  BNFL will provide  the Company with
research and development funding of $500,000 annually for five years, which will
be used to offset certain of the Company's research and development expenses.
 
RESULTS OF OPERATIONS
 
  YEAR ENDED DECEMBER 31, 1994 COMPARED TO YEAR ENDED DECEMBER 31, 1995
 
    Revenues increased by $4.4 million or  12.4%, from $36.0 million in 1994  to
$40.4  million in 1995. The increase was  primarily the result of an increase in
revenues from waste  treatment projects,  which were  $6.7 million  in 1994  and
$11.1  million in 1995. The most significant  of the waste treatment projects is
the  Savannah  River  M-Area  project.  Under  this  three-year,  $14.1  million
contract,  the Company has constructed a  vitrification facility at the Savannah
River site in South Carolina to convert approximately 90,000 cubic feet of mixed
waste to stable glass. Revenues from this contract were $2.3 million in 1994 and
$6.1 million in 1995. Revenues in 1995  also include a $1.0 million teaming  fee
received  from BNFL in exchange for  the Company's agreement to exclusively team
with BNFL on a DOE waste treatment project in Hanford, Washington. Revenues from
technical support services were $29.3 million in 1994 and $29.3 million in 1995.
 
    Gross profit increased by $1.1 million  or 15.3%, from $7.1 million in  1994
to  $8.2 million  in 1995. The  teaming fee from  BNFL represented approximately
$1.0 million of the increase. As a percentage of
 
                                       14
<PAGE>
revenues, gross profit  increased from  19.8% in 1994  to 20.3%  in 1995.  Gross
profits  from waste treatment  projects were lower  in 1995 as  compared to 1994
principally as a result of project mix and modifications to the estimated  costs
to  complete the Savannah  River M-Area project. The  estimated cost to complete
the Savannah River M-Area project was increased due to the Company's decision to
make additional  investments in  the  on-site facility  to better  position  the
Company  to handle  additional waste  streams at  that site.  Gross profits from
technical support services were $4.0 million in 1994 and $4.1 million in 1995.
 
    Selling, general and  administrative expenses declined  by $50,000 or  0.8%,
from   1994  to  1995.  As  a  percentage  of  revenues,  selling,  general  and
administrative expenses  declined from  16.5%  in 1994  to  14.5% in  1995.  The
decline  was  principally  the result  of  higher utilization  of  the Company's
engineering staff on  waste treatment projects  and joint ventures,  as well  as
increased revenues without a corresponding increase in administrative overhead.
 
    In  1994, the Company had  net interest expense of  $595,000 compared to net
interest income of $57,000  in 1995. In January  1995, the Company issued  $16.0
million  of Convertible Preferred Stock, the net proceeds of which were utilized
to repay outstanding short-term  borrowings with the  balance being invested  in
short-term investment grade securities.
 
    Income  tax  expense  was $12,000  in  1994  compared to  $101,000  in 1995.
Utilization of net operating loss carryforwards in 1994 and 1995 resulted in  no
federal income taxes other than alternative minimum tax. The 1994 and 1995 state
income  tax  amounts relate  to  income taxes  payable  to states  which  do not
recognize net operating loss  carryforwards. At December  31, 1995, the  Company
has  a net  operating loss carryforward  of approximately $2.2  million of which
approximately $1.1  million  resulted from  the  exercise by  employees  of  the
Company of non-qualified stock options in 1995. Accordingly, utilization of this
$1.1  million of the net operating loss  carryforward will result in a credit to
capital in excess of par.
 
    The Company's  proportionate  share in  the  loss  of its  50%  owned  joint
venture,  Vitritek Environmental, Inc. ("Vitritek"),  increased from $321,000 in
1994 to  $824,000  in 1995.  Vitritek's  1995 loss  was  the result  of  limited
business  activity, as well as a $1.2 million write-off of Vitritek's intangible
assets related to asbestos vitrification technology rights. In 1995,  management
of  Vitritek  concluded that  the market  for  asbestos vitrification  would not
develop quickly  enough to  generate the  cash flows  necessary to  recover  the
intangible assets acquired by Vitritek in 1993.
 
    Net  income increased by $1.2 million or approximately 465% from $257,000 in
1994 to $1.5 million  in 1995. The increase  resulted from higher revenues  from
waste  treatment projects, the receipt of the  BNFL $1.0 million teaming fee and
lower interest expense offset by the higher loss resulting from the write-off of
intangible assets realized from the Vitritek joint venture.
 
  YEAR ENDED DECEMBER 31, 1993 COMPARED TO YEAR ENDED DECEMBER 31, 1994
 
    Revenues increased by $2.5  million or 7.4%, from  $33.5 million in 1993  to
$36.0  million  in  1994.  The  increase  was  primarily  a  result  of revenues
recognized on the Company's waste treatment projects, which were $3.7 million in
1993 and $6.7 million  in 1994, particularly the  Savannah River M-Area  project
which  commenced in 1994. Revenues from technical support services declined from
$29.8 million in 1993 to $29.3 million in 1994.
 
    Gross profit increased by $2.2 million  or 45.2%, from $4.9 million in  1993
to  $7.1 million in  1994. As a  percentage of revenues,  gross profit increased
from 14.6% in 1993 to 19.8% in 1994. The increase primarily resulted from  gross
profits achieved on waste treatment projects which generally have a higher gross
profit  margin  than technical  support services.  Gross profits  from technical
support services were $3.7 million in 1993 and $4.0 million in 1994.
 
    Selling, general and administrative expenses increased by $188,000 or  3.3%,
from  $5.7 million in 1993 to $5.9 million in 1994. As a percentage of revenues,
selling, general  and administrative  expenses declined  from 17.1%  in 1993  to
16.5%  in 1994. This decline was principally the result of higher utilization of
the Company's engineering staff on waste treatment projects and joint ventures.
 
                                       15
<PAGE>
    Net interest expense increased  from $372,000 in 1993  to $595,000 in  1994.
The  $223,000 increase was primarily the  result of higher short-term borrowings
on the Company's line of credit and higher interest rates.
 
    Income tax expense was $73,000 in 1993 compared to $12,000 in 1994. The 1993
and 1994 income tax amounts relate to state income taxes payable.
 
    The Company's 50% owned joint  venture, Vitritek, began operations in  1994.
The  Company's  proportionate  share  in  the  loss  of  Vitritek  was $321,000.
Vitritek's 1994 loss was  the result of the  entity's startup costs and  limited
business activity.
 
    In  1993, the Company had a net loss  of $1.3 million compared to net income
of $257,000 in 1994. The improvement in earnings resulted primarily from  higher
revenues from waste treatment projects.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    During  1995, the  Company completed  two significant  capital transactions,
which provided net proceeds of approximately $24.5 million. In January 1995, the
Company issued  to Carlyle  for  $16.0 million,  160,000 shares  of  Convertible
Preferred  Stock and  an option  to purchase  an additional  1,250,000 shares of
Common Stock,  at any  time  prior to  January 24,  1999  for $3.75  per  share.
Proceeds  to  the Company,  net  of offering  expenses,  were $14.7  million. In
November 1995, the Company issued to BNFL a $10.0 million convertible debenture,
which accrues interest at the one-year London Interbank Offered Rate (LIBOR) for
a period of five years, for $9.8  million, net of debt issue cost. In  addition,
the  Company  generated $2.0  million  upon the  exercise  of stock  options and
warrants held by employees and others. The Company used certain of the  proceeds
from these transactions to retire short-term borrowings of $7.6 million with the
balance  being used for working capital needs and to further the Company's waste
treatment  technologies  through  acquisitions,  joint  ventures  and  strategic
alliances.
 
    During  1995, the Company  invested approximately $4.5  million in property,
plant and  equipment,  the  DuraChem  joint  venture  and  an  acquisition.  The
investments in property, plant and equipment and DuraChem related principally to
the  construction of DuraMelters-TM-  and related components.  In November 1995,
the Company acquired 80% of the outstanding capital stock of DuraTherm, formerly
Bird Environmental Gulf Coast, Inc. ("BEGCI"),  a company which operates a  RCRA
Part B-permitted waste facility using thermal desorption technology in San Leon,
Texas.  The  Company purchased  its  interest in  DuraTherm  for one  dollar and
incurred approximately $260,000  of transaction  costs. In  connection with  the
acquisition,  the Company agreed to  invest up to $5.1  million in DuraTherm (of
which up to $2.7 million is for  capital improvements and up to $2.4 million  is
for  working capital) in exchange for  preferred stock of DuraTherm. The Company
presently expects  to invest  in  the aggregate  approximately $6.4  million  in
property,  plant and equipment, DuraTherm and  the DuraChem joint venture during
1996.
 
    During  1995,  the  Company  used  $847,000  of  cash  flows  for  operating
activities.  Cash  flows from  operations were  primarily  impacted by  the $4.0
million increase  in accounts  receivable and  costs and  estimated earnings  in
excess  of billings on  uncompleted contracts. Of the  $17.0 million in accounts
receivable and costs and estimated earnings in excess of billings on uncompleted
contracts at December 31, 1995, $10.5 million relates to contracts with two  DOE
contractors  which  are expected  to be  collected  in 1996.  The Company  has a
backlog of orders of approximately $48.0 million at December 31, 1995, of  which
approximately $23.0 million is expected to be completed in 1996.
 
    The  Company has a revolving line of  credit agreement with a bank providing
for borrowings  up to  $7.0  million based  upon  eligible amounts  of  accounts
receivable,  as  defined  in  the agreement.  Borrowings  outstanding  under the
agreement are due on demand and bear interest at the bank's prime interest  rate
plus  1% (9.25% as of April 22, 1996).  At December 31, 1995, no borrowings were
outstanding and the Company had available borrowings of $5.9 million.
 
                                       16
<PAGE>
    The Company believes cash flows from operations, cash resources available at
December 31,  1995,  the  net  proceeds of  this  offering  and,  if  necessary,
borrowings  available under the bank  line of credit will  be sufficient to fund
currently planned capital improvements and  meet its operating needs,  including
the quarterly preferred dividend requirement of $320,000.
 
SEASONALITY
 
    Seasonality   generally  does  not  affect  the  Company's  waste  treatment
technology operations;  however,  it  does  have  an  effect  on  the  Company's
technical  support services business.  A large component  of the Company's staff
augmentation business  is devoted  to nuclear  power plant  outage support.  The
seasonal  nature of this work  is caused by utilities'  desire to schedule their
nuclear unit refueling and maintenance outages during spring and fall when,  due
to  moderate  temperatures, electrical  load demand  is  lowest. In  addition, a
significant portion  of the  Company's  computer and  communications  consulting
services  client base  is in  the federal,  state and  local government sectors.
Funding appropriations for many of these clients' projects are coordinated  with
the  government's  fiscal  years  which  causes  some  seasonal  impact  on this
business. In contrast to  the outage support business,  demand for computer  and
communications consulting services typically peaks in winter and summer months.
 
ACCOUNTING MATTERS
 
    The  Company  will  adopt  the  provisions  of  the  Statement  of Financial
Accounting  Standards  (SFAS)  No.  121,  "Accounting  for  the  Impairment   of
Long-Lived  Assets and Long-Lived  Assets to be  Disposed Of" and  SFAS No. 123,
"Accounting for Stock-Based Compensation" in 1996.  Adoption of SFAS No. 121  is
not  expected to have a  material impact on the  Company's financial position or
results of  operations for  1996.  Beginning in  1996,  the Company  expects  to
present  information required by SFAS No. 123 with respect to stock compensation
on a pro forma basis and will continue to measure stock compensation based  upon
the guidance provided in Accounting Principles Board Opinion No. 25.
 
                                       17
<PAGE>
                                    BUSINESS
 
OVERVIEW
 
    GTS  Duratek provides waste treatment  solutions for radioactive, hazardous,
mixed and other wastes. The  Company's strategy is (i)  to provide the low  cost
solution  to process contaminated waste streams, (ii) to combine its proprietary
technologies and  technical  support  services  to  provide  full-service  waste
treatment,  and  (iii) to  team, where  appropriate,  with other  companies with
complementary expertise to advance GTS Duratek's treatment solutions within  its
target  markets  and  into  new markets.  The  Company's  vitrification, thermal
desorption and  ion exchange  technologies  convert waste  to stable  forms  for
storage  or disposal while achieving  significant volume reduction. Accordingly,
the Company  believes its  customers benefit  from significant  cost savings  as
compared  to other  commercially-available alternatives. To  implement its waste
treatment technologies  and  provide  related technical  support  services,  the
Company  has a staff of highly  skilled personnel with significant environmental
services experience.
 
    The Company's  targeted markets  are the  former nuclear  weapon  production
sites  administered  by the  DOE,  commercial radioactive  waste  generators and
selected  hazardous  and   other  waste   generators.  In   THE  1995   BASELINE
ENVIRONMENTAL  MANAGEMENT  REPORT, the  DOE estimates  that  the cleanup  of the
nuclear wastes at the U.S. facilities under its management will take at least 75
years and cost $230  billion. The Company estimates  that $400 million per  year
will  be  spent  worldwide  on  storage  and  disposal  of  commercial low-level
radioactive waste. The  Company believes  it is  well positioned  to compete  in
these  markets because  it has processed  or currently has  contracts to process
waste at two DOE sites and two commercial waste sites.
 
    In serving these markets, the Company has achieved the following milestones:
(i) the first  to vitrify low-level  radioactive waste at  a DOE site  (Fernald,
Ohio);   (ii)  the  award   and  construction  of   the  first  commercial-scale
vitrification project for low-level  radioactive waste at  a DOE site  (Savannah
River  M-Area Project);  (iii) the  successful conversion  of commercial nuclear
power  plant  radioactive   waste  into   glass  and  the   construction  of   a
commercial-scale  vitrification facility  in Barnwell, South  Carolina; and (iv)
the selection to design  and build a  vitrification system for  radon-containing
sludge at the DOE's K-65 silos at Fernald, Ohio.
 
    The  Company's waste  treatment technologies  include vitrification, thermal
desorption and ion exchange and can be used independently or in tandem to  solve
the  waste  disposal  or  storage  problems  of  its  customers.  The  Company's
vitrification   technology   converts    waste   to   environmentally    stable,
leach-resistant  glass through a patented  high-temperature melter system, known
as a DuraMelter-TM-. The  thermal desorption and  ion exchange technologies  are
used by the Company to treat petrochemical and liquid radioactive waste streams,
respectively, and can be used to separate the waste streams into components that
can  either be safely stored, recycled or used as additives in the vitrification
of other waste streams. The Company's  ability to integrate its waste  treatment
technologies  enables  it to  handle a  diversity  of waste  streams in  a cost-
effective manner.
 
    The Company has over 450 engineers, consultants and technicians who  support
and  complement its waste treatment and stabilization services and also provides
highly specialized technical support services  for the Company's customers.  The
technical  support  services  provide a  consistent  source of  revenue  and the
complementary expertise  for  the Company  to  expand and  diversify  its  waste
treatment  technologies.  The services  provided  by the  Company  include staff
augmentation and  outage support,  principally to  assist nuclear  power  plants
during  regular maintenance shutdowns, environmental and computer consulting and
environmental safety training.  Having these technical  resources available  has
enabled the Company to move its technologies from bench-scale laboratory testing
to field operations and commercial application more rapidly and to handle larger
scope waste cleanup projects.
 
                                       18
<PAGE>
MARKET OVERVIEW
 
    The  primary markets for the Company's waste treatment technologies include:
(i) the former  nuclear weapon production  sites administered by  the DOE,  (ii)
commercial  radioactive waste generators and  (iii) selected hazardous and other
waste generators. The following  is a summary  of the types  of wastes that  are
generated  by these  entities which  require treatment,  remediation, storage or
disposal:
 
  RADIOACTIVE WASTE
 
    Radioactive waste,  which  is  generated  either  by  government  facilities
(usually  DOE weapons  facilities) or  by private  sector commercial enterprises
such as nuclear power plants, medical laboratories and university and industrial
research  and  development  facilities,  is  categorized  as  either  high-level
radioactive  waste or low-level radioactive  waste. High-level radioactive waste
is primarily comprised  of spent  nuclear fuel  rods from  nuclear reactors  and
highly  radioactive waste generated  by the processing  of nuclear materials for
weapons production. Low-level radioactive  waste generally consists of  ordinary
materials  that have become  contaminated due to their  proximity to more potent
radioactive material.  According  to  the DRAFT  WASTE  MANAGEMENT  PROGRAMMATIC
ENVIRONMENTAL  IMPACT STATEMENT, the DOE  estimates that there are approximately
52.4 million cubic  feet of  low-level radioactive waste  stored throughout  the
United  States at DOE facilities (not  including mixed waste), and approximately
14.1 million cubic feet  of high-level radioactive waste.  In THE 1995  BASELINE
ENVIRONMENTAL  MANAGEMENT  REPORT, the  DOE estimates  that  the cleanup  of the
nuclear wastes at the U.S. facilities under its management will take at least 75
years and cost $230 billion.
 
    For the commercial low-level radioactive waste market, the Company estimates
that $400 million per year will be spent worldwide on storage and disposal.  The
demand  for  the  treatment  and  disposal  of  commercially-generated low-level
radioactive waste has been created by the limited number of available  low-level
radioactive waste disposal sites. GTS Duratek's DuraChem facility is adjacent to
Barnwell,  which the Company believes is a strategic advantage since Barnwell is
one of the few facilities permitted to receive commercially-generated  low-level
radioactive waste.
 
  MIXED WASTE
 
    Mixed  waste is radioactive waste intermingled with hazardous materials. The
cleanup of this waste is a high priority for the federal government, because  it
falls  directly under the  mandate of the Federal  Facility Compliance Act which
requires meeting waste  cleanup targets  by specified dates.  Mixed waste  poses
certain  cleanup difficulties since the radioactive and hazardous components are
governed by separate sets of administrative rules and regulations and  companies
handling  such waste must  comply with both  sets of rules  and regulations. The
radioactive component is governed by the  Atomic Energy Act of 1954 ("AEA")  and
is  regulated  by  the  DOE for  waste  at  DOE facilities  and  by  the Nuclear
Regulatory Commission ("NRC")  for commercially-generated  waste. The  hazardous
waste  component is governed by RCRA and is regulated by the EPA and by the laws
of individual states.
 
    The  following  table  illustrates  estimated   volume  in  cubic  feet   of
radioactive  waste at major DOE sites  according to the DRAFT WASTE PROGRAMMATIC
ENVIRONMENTAL IMPACT STATEMENT (AUGUST 1995).
 
                     CURRENT INVENTORY OF RADIOACTIVE WASTE
                               AT MAJOR DOE SITES
                         (CUBIC FEET IN THOUSANDS) (1)
 
<TABLE>
<CAPTION>
                                                        LOW-LEVEL WASTE   MIXED WASTE   HIGH-LEVEL WASTE
<S>                                                     <C>              <C>            <C>
Savannah River Site...................................        18,008             706            4,481
Oak Ridge Reservation.................................         8,828           2,083                0
Los Alamos National Laboratory........................         5,296             106                0
Idaho National Engineering Laboratory.................         3,884           1,236              403
Hanford Site..........................................         3,107           1,271            9,138
All other DOE Sites...................................        13,277           2,578               56
                                                              ------           -----           ------
Total All DOE Sites...................................        52,400           7,980           14,078
                                                              ------           -----           ------
                                                              ------           -----           ------
</TABLE>
 
- ------------------------
(1) Represents currently stored inventory plus 20 year projected volume.
 
                                       19
<PAGE>
  HAZARDOUS AND OTHER WASTE
 
    Hazardous waste is waste that is classified as hazardous under the  Resource
Conservation  and  Recovery  Act  of  1976, as  amended  ("RCRA")  or  the Toxic
Substances Control Act ("TSCA"). Based on  data obtained from the United  States
Environmental  Protection Agency  ("EPA"), it  is estimated  that more  than 258
million tons of hazardous waste, as classified under RCRA or TSCA, was generated
in the United States in 1993. Other wastes that the Company has targeted or  may
target   for  processing   using  its   waste  treatment   technologies  include
petrochemical waste, asbestos and laboratory and medical waste.
 
PROPRIETARY WASTE TREATMENT TECHNOLOGIES
 
    The Company has developed several waste treatment technologies for use on  a
variety  of radioactive, hazardous, mixed and other waste streams. The Company's
existing waste treatment technologies include vitrification, thermal  desorption
and  ion exchange and can be used independently  or in tandem to solve the waste
disposal or storage problems of its customers. The following is a brief  summary
of the Company's waste treatment technologies.
 
  VITRIFICATION
 
    GTS  Duratek's  vitrification  technology  involves  combining  radioactive,
hazardous, mixed  and  other  waste  with  glass-forming  additives  in  a  high
temperature  melter,  known as  a DuraMelter-TM-,  that reaches  temperatures of
1150 DEG.C to 1450 DEG.C (or 2100 DEG.F to 2640 DEG.F). The high temperatures of
the DuraMelter-TM- cause the  waste and any additives,  to form a molten  liquid
that  becomes  solid  glass  as  it  cools.  As  the  molten  liquid  cools, the
radioactive or  hazardous  atoms  become  chemically  bonded  in  the  molecular
structure  of the  glass for  long-term storage  or disposal,  thereby virtually
eliminating contamination of  the environment.  For certain  waste streams,  the
Company's vitrification technology can achieve volume reductions of up to 97%.
 
    The  principal advantages of the Company's vitrification technology compared
to conventional methods are  that it (i) provides  a safe, stable and  long-term
means  of storing wastes and  (ii) results in significant  cost savings over the
waste life-cycle  (i.e.,  the  cycle from  waste  generation  through  permanent
storage  or disposal) due to the considerable volume reduction that is achieved.
The Company estimates that  for certain wastes the  total handling and  disposal
costs  could  be  50%  lower  than  conventional  landfill  methods,  even  when
considering the  capital  costs of  the  DuraMelter-TM-. For  certain  forms  of
non-radioactive  waste,  there  is  no  storage  or  disposal  cost  because the
vitrification process eliminates the contaminants and the resulting glass can be
recycled.
 
    The DuraMelter-TM- is a proprietary melter system within a  refractory-lined
cavity incorporating submerged electrodes which heat up the materials within the
cavity. Contaminated waste materials are deposited onto a melt surface in either
a  liquid (slurry) or a solid form.  Glass forming additives are also introduced
into the  system  and  the  amount  of such  additives  is  dependent  upon  the
characteristics  of the  waste stream. As  the electrodes  in the DuraMelter-TM-
raise the temperature above  600 DEG.C, the waste  and additive mixture  becomes
electrically  conductive. Resistance to  the passage of  electricity through the
mixture causes further heating and maintains the waste and additive mixture in a
molten state. This process  is known as "joule  heating" and typically  requires
temperatures  of about 1150  DEG.C. Within the  DuraMelter-TM-, water evaporates
and organic substances  are oxidized  forming simple gases  which are  channeled
into  the  patented  off-gas  treatment  system.  The  inorganic  radioactive or
hazardous substances in the waste are  dissolved into the molten glass  mixture.
The  molten glass  exits through a  side opening  near the floor  of the melting
cavity and, depending upon  the characteristics of the  waste stream, is  either
discharged  in bulk  or directed  into the  proprietary GTS  Duratek gem machine
where it  forms  into beads,  1  to 2  centimeters  in diameter,  for  long-term
storage.  As  the beads  of molten  mixture cool,  the inorganic  radioactive or
hazardous substances become  chemically bonded  or "locked"  into the  molecular
structure of the glass.
 
    DuraMelters-TM-  range in size from small bench-scale units used for testing
and characterization of waste streams  to commercial sized melters designed  for
large waste treatment and remediation projects. Currently, the Company's largest
commercial  operating DuraMelters-TM- can process  up to approximately 400 cubic
feet of  waste  per  day. The  design  of  the DuraMelter-TM-  can  be  modified
depending  upon  the characteristics  of the  waste stream  to be  processed. To
process waste streams that have  a higher content of  soil or sand, the  Company
has  designed  a  DuraMelter-TM-  with  higher  temperature  capability  (up  to
1450 DEG.C or 2640 DEG.F). To
 
                                       20
<PAGE>
process waste streams that include a high content of corrosive elements such  as
sulfates,   phosphates,  lead   and  nitrates,   the  Company   has  designed  a
DuraMelter-TM- with multiple waste chambers  to protect the electrodes from  the
corrosiveness of the waste stream.
 
  THERMAL DESORPTION TECHNOLOGY
 
    The  Company's thermal desorption technology separates hazardous wastes into
more stable waste components that can either be safely stored, recycled or  used
as  additives in the processing of other  waste streams. The overall result is a
reduction in  the  costs of  treating  and disposing  of  such wastes.  In  this
process,  hydrocarbon sludges and  cakes are placed in  a thermal desorber which
utilizes temperatures in  excess of 635  DEG.C (or 1175  DEG.F) to separate  the
waste  into four components. The components  include solids which meet universal
treatment standards  land  disposal  restrictions, water  amenable  to  low-cost
conventional  waste  water treatment  or deep  well  disposal, reusable  oil and
noncondensable gases. The Company's thermal desorption technology will initially
be used at its DuraTherm facility in San Leon, Texas for the processing of  high
solid  content petroleum  refinery and  petrochemical manufacturing  wastes. The
high temperature  thermal  desorption  process is  protected  by  three  patents
exclusively  licensed by  the Company.  See "Business  -- Status  of Current and
Potential Waste Treatment Projects -- DuraTherm Facility in San Leon, Texas."
 
  ION EXCHANGE
 
    The  Company  manufactures  and  supplies  highly  specialized  waste  water
purification    systems   and   patented   ion    exchange   media,   known   as
DURASIL-Registered  Trademark-,  for  commercial   nuclear  power  plants,   DOE
facilities  and industrial clients.  DURASIL-Registered Trademark- is formulated
to separate specific  contaminants from  liquid waste  streams thereby  allowing
radioactive and hazardous ions to be removed and separated into their respective
species.  Since  radioactive  and  hazardous  materials  are  regulated  by  two
different government  agencies, this  ability to  separate mixed  waste  greatly
simplifies   its  disposal.  DURASIL-Registered  Trademark-  also  has  physical
characteristics  that  enable  it  to  endure  extreme  waste  water  processing
conditions.  It  is mechanically  stable and  nonflammable,  does not  shrink or
swell, is virtually immune to  radiation damage and has no  effect on the pH  of
the waste stream. The Company has developed different
DURASIL-Registered    Trademark-   ion   exchange   media   depending   on   the
characteristics  of  the  liquid  waste  stream.  To  complement  its  line   of
DURASIL-Registered Trademark- ion exchange media, the Company also developed the
DURA  C-TM-  line  of  activated  carbons  which  are  high  capacity, specialty
filtration media designed for treatment of water containing mixed waste.
 
    The Company  utilizes  its  proprietary  ion  exchange  technology  and  its
abilities  in designing and implementing waste  water treatment systems to solve
the liquid waste treatment  and disposal problems of  its customers. At the  DOE
site in Fernald, Ohio, the Company studied liquid samples from waste streams and
conducted bench-scale evaluations of its DURASIL-Registered Trademark- and other
nonproprietary  ion exchange media  in conjunction with  various other treatment
methods. After successful  completion of  the first  phase of  the project,  the
Company  was  awarded the  second phase  in which  it designed,  constructed and
operated a  demonstration unit  on site  at Fernald.  In addition,  the  Company
designed,  constructed and  operated a  waste water  treatment system  for mixed
waste for Martin  Marrieta Energy Systems,  Inc. at its  Oak Ridge Facility  and
designed  and  built three  waste  water cleanup  systems  for the  Taiwan Power
Company's Kuosheng  Nuclear  Power Plant.  In  February 1995,  the  Company  was
awarded  an $800,000 subcontract by WSRC to provide ion exchange water treatment
services at the DOE's Savannah River site.
 
  INTEGRATED APPROACH TO WASTE TREATMENT
 
    The Company  believes that  its  ability to  integrate its  waste  treatment
technologies  gives  it  a competitive  advantage  by  enabling it  to  handle a
diversity of  waste streams  in a  cost-effective manner.  The Company  has  the
ability  to  use  its  thermal  desorption  and  ion  exchange  technologies  to
"pre-treat" the waste stream, separating it  into components that can either  be
safely  stored using  cost-effective conventional  methods, recycled  or used as
additives in the  processing of other  waste streams. For  example, the  Company
utilizes  its ion  exchange technology on  liquid waste streams  to separate the
water from the radioactive or hazardous contaminants before further treatment of
the waste in a DuraMelter-TM-. In  thermal desorption, one of the byproducts  of
the process is a powdery residue that has good glass-making qualities and may be
able to be used as an additive in the vitrification of other waste streams.
 
                                       21
<PAGE>
    As part of its integrated strategy, the Company provides important ancillary
services  in support  of its  technologies. In  the pre-treatment  or "upstream"
phase of a waste treatment project, the Company provides waste  characterization
analyses. In addition, the Company can create and implement environmental safety
and  health  plans  and  other  training programs  for  personnel  at  the waste
treatment site.  Following  the  pre-treatment phase,  the  Company  provides  a
variety  of  "in-stream"  and  post-treatment  services.  The  Company  provides
radiation  monitoring  and  technical  and  operational  personnel  during   the
processing  of the waste and  is involved in the  decontamination and cleanup of
the  facilities  following  the  waste  treatment  operations.  This  integrated
approach  has been essential  in the Company's  cleanup of low-level radioactive
wastes at the DOE's Savannah River site. In addition to designing,  constructing
and  operating  the  DuraMelter-TM- to  vitrify  the  DOE's waste  on  site, the
Company's  technical  personnel  are  providing  additional  technical   support
services.  By having these  technical resources available,  the Company has been
able to  move its  technologies  from bench-scale  laboratory testing  to  field
operations  and commercial application  more rapidly and  to handle larger scope
waste cleanup projects.
 
STATUS OF CURRENT AND POTENTIAL WASTE TREATMENT PROJECTS
 
    The Company has completed, is currently involved in or is bidding on several
vitrification projects for the DOE  through subcontracts with DOE site  managers
and   in  the   application  of   its  waste   treatment  technologies   to  the
commercially-generated low-level radioactive waste and hazardous waste  markets.
The following is a summary of the status of several of the Company's major waste
treatment projects.
 
  SAVANNAH RIVER M-AREA PROJECT
 
    The  DOE's Savannah River site near  Aiken, South Carolina has approximately
18.7 million cubic feet  in total currently stored  inventory and twenty  years'
projected  volume  of low-level  radioactive and  mixed wastes.  This represents
about 31%  of all  of such  wastes throughout  the DOE  weapons facilities.  The
Savannah  River site is  the largest single  repository of low-level radioactive
and mixed wastes among all DOE sites.
 
    In November  1993,  the  Company  was awarded  a  subcontract  by  the  site
management  and operations  contractor, WSRC,  to vitrify  90,000 cubic  feet of
low-level mixed waste sludge stored in  the M-Area tanks at Savannah River.  GTS
Duratek's  subcontract represents only 0.5% of the total mixed waste inventoried
and projected to be generated at Savannah River. The Company's obligations under
this subcontract entail vitrifying the  waste and performing ancillary  services
related  to  the handling  of the  waste, including  removal of  the radioactive
sludges from the storage tanks, cleanup and decontamination of the storage tanks
and placement of the containers of the glass waste in a secure storage area. The
project is expected to take approximately three years to complete.
 
    Construction of the melter began in  July 1995 and was completed on  January
10, 1996. The Company designed and constructed the DuraMelter-TM- and will serve
as  the operator. WSRC began an operational readiness assessment of the facility
in January  1996  which  will  allow  the Company  to  begin  operation  of  the
DuraMelter-TM-  upon completion of a short testing period using non-radioactive,
simulated  waste   material.   The   M-Area  contract   represents   the   first
"privatization"  type contract entered into by the  DOE for waste cleanup at its
facilities. Pursuant to  this contract,  the Company  will own  and operate  the
DuraMelter-TM-  under its subcontract  with WSRC. The  Company believes that the
DOE will enter  into more  of these privatization  arrangements with  commercial
vendors  and that the Company's contract  at Savannah River has been extensively
used as a model for contemplated future privatized DOE waste cleanup projects.
 
  FERNALD MAWS PROJECT
 
    The Company's  first vitrification  project, which  began in  1991, was  the
Minimum  Additive  Waste Stabilization  ("MAWS")  project at  the  DOE's Fernald
Environmental Management Project near Cincinnati, Ohio under a subcontract  with
Argonne   National  Laboratories.  The  MAWS   project  involved  the  Company's
demonstration of minimum additive waste vitrification, or blending waste streams
of varying chemical and physical characteristics in a melter and exploiting  the
natural  glass-forming properties of each  component waste. The Company believes
that the application of the MAWS concept to future waste treatment projects will
result in much lower operating costs and achieve significant volume reduction by
producing glass that is almost entirely composed of waste materials. GTS Duratek
designed, constructed and
 
                                       22
<PAGE>
operated a DuraMelter-TM- vitrification facility at Fernald and began processing
simulated wastes in September 1993  and actual Fernald mixed radioactive  wastes
in   July  1994  in  accordance  with  its  subcontract  with  Argonne  National
Laboratories. Through the  MAWS project,  the Company  became the  first in  the
country to process mixed waste at a DOE facility. Through MAWS and an additional
related  project, the Company gained extensive knowledge of waste streams at the
DOE's facilities,  which the  Company believes  provides it  with a  competitive
advantage in procuring future subcontracts for DOE projects.
 
  FERNALD K-65 PROJECT
 
    In  September 1994,  FERMCO awarded  the Company  a subcontract  to design a
DuraMelter-TM- to vitrify the sludge in the K-65 silos at Fernald. The sludge in
the K-65 silos contains substantial amounts of radon, lead, nickel,  phosphates,
nitrates and sulfates.
 
    The initial K-65 subcontract called for the Company to provide a pilot-scale
melter and associated gem machine capable of processing up to three tons per day
of  the K-65 silo waste. With GTS Duratek's assistance, FERMCO began assembly of
the DuraMelter-TM- at Fernald in July 1995 and completed construction at the end
of 1995.  The Company  is advising  FERMCO during  construction tests  and  will
provide  consulting  support for  the startup  of the  melter. FERMCO,  the site
environmental restoration  management  contractor,  will  own  and  operate  the
DuraMelter-TM-. Although the Company has substantially completed its obligations
under  the initial subcontract for the pilot-scale melter, the unit will process
only a small fraction of  the radioactive waste contained  in the K-65 silos  at
Fernald.  FERMCO recently awarded  the Company a new  subcontract to develop the
process chemistry  for  the operation  of  a pilot-scale  vitrification  system.
FERMCO  plans  to  build a  vitrification  system  five times  the  size  of the
pilot-scale vitrification  system for  the cleanup  of the  K-65 waste  and  has
issued  an  expression  of interest  to  identify companies,  like  GTS Duratek,
capable of designing and constructing such a vitrification system.
 
  HANFORD TANK WASTE REMEDIATION SYSTEM PROJECT
 
    The Hanford, Washington site is the single largest DOE facility and contains
the largest amount of high-level radioactive waste in the United States. Hanford
contains approximately 61  million gallons of  high-level radioactive waste  and
spent  nuclear fuel which is contained in 177 underground storage tanks. The DOE
has recently released a  request for proposals ("RFP")  for the cleanup of  this
waste.  According  to estimates  prepared  by the  DOE,  the cleanup  project at
Hanford could take at least 20 years and cost over $40 billion.
 
    The final RFP for Phase I of the project was released in February 1996  with
the DOE expected to award contracts for Phase I around August 1996. According to
the  RFP, the first part of Phase I  involves a 16 month developmental period to
establish technical and operational elements  of the privatized facilities.  The
second  part of Phase I involves parallel vitrification test demonstrations that
will treat about 6% to 13% of the  Hanford tank waste by the year 2004. The  RFP
indicates  that the DOE will select at least two contractor teams to perform the
Phase I  vitrification  tests. Each  team  will be  responsible  for  vitrifying
between  one  and  two  million  gallons of  the  Hanford  waste  with  one team
vitrifying both high-level and low-level  radioactive wastes and the other  team
storing  high-level  radioactive  wastes  and  vitrifying  low-level radioactive
wastes. The Phase I portion of the project will conclude with a  decontamination
and  decommissioning of  the cleaned  tanks, followed  by RCRA  closure and site
decontamination, all of which is expected to last an additional two years. Phase
II of the cleanup of the Hanford tank waste is not expected to start until 2004.
The Company has  agreed to  jointly pursue the  Hanford project  with BNFL.  See
"Business -- Joint Venture and Collaborative Arrangements -- BNFL."
 
  IDAHO ADVANCED MIXED WASTE TREATMENT PROJECT
 
    The  Company and BNFL have  also recently agreed to  exclusively team on the
DOE's advanced mixed  waste treatment  project in  Idaho. The  DOE has  recently
issued  an RFP for  this project and  is expected to  award contracts by October
1996. The DOE is required, under an agreement with the State of Idaho, to  begin
processing  the mixed waste on  site by 2003 and to  have the waste removed from
the State of  Idaho by no  later than 2018.  There is an  estimated 2.3  million
cubic  feet  of  inventoried and  non-inventoried  waste and  an  additional 1.4
million cubic feet of contaminated soil that may require processing. This  waste
is currently being stored in drums and crates in buildings and in earthen berms.
See "Business -- Joint Venture and Collaborative Arrangements -- BNFL."
 
                                       23
<PAGE>
  DURACHEM FACILITY IN BARNWELL, SOUTH CAROLINA
 
    As  part  of  the  DuraChem  joint  venture,  the  Company  and Chem-Nuclear
constructed  a  vitrification  facility  at  Chem-Nuclear's  radioactive   waste
processing center at Barnwell, South Carolina. During 1995, the Company designed
and constructed a new DuraMelter-TM- at the facility and will be responsible for
the  vitrification operations.  The facility  was granted  its initial operating
permit in  November  1995. Chem-Nuclear  manages  the overall  facility  and  is
responsible   for  procuring  all  required  operating  permits,  obtaining  the
low-level radioactive waste from  its customers, transporting  the waste to  the
facility  and  removing  the  waste  for  ultimate  disposal  once  it  has been
vitrified. Through the DuraChem joint venture, GTS Duratek has become the  first
company  in  the  United  States  to  convert  commercially  generated low-level
radioactive waste to glass. See "Joint Venture and Collaborative Arrangements --
DuraChem."
 
    DuraChem's Barnwell facility  will process contaminated  filtration and  ion
exchange resins from nuclear power plants and contaminated wastes from hospitals
and  laboratories.  In initial  test runs  on  contaminated nuclear  power plant
resins, the DuraMelter-TM- achieved significant waste volume reductions of up to
97%. On other  types of wastes,  the Company believes  that it will  be able  to
achieve  volume reductions  of 93% or  better. The DuraChem  facility is located
adjacent to  the Barnwell  landfill, one  of the  few facilities  in the  United
States  permitted to accept  commercially-generated low-level radioactive waste.
Over the last 15 years, no new  radioactive waste storage sites have been  built
or  licensed in the United States. The Company believes that DuraChem's location
is advantageous because of  its proximity to the  nation's primary facility  for
handling low-level radioactive waste.
 
  DURATHERM FACILITY IN SAN LEON, TEXAS
 
    The  Company acquired an 80% interest  in BEGCI, since renamed DuraTherm, on
November 30,  1995.  DuraTherm  is  a  RCRA  Part  B-permitted  hazardous  waste
recycling  center  located in  San  Leon, Texas  which  uses a  patented thermal
desorption technology to treat and  produce recyclable materials from  hazardous
oil  refinery and  petrochemical plant  sludges. The  Company purchased  the 80%
interest for one dollar  from a subsidiary of  Bird Corporation and agreed  with
the remaining stockholders to invest up to $5.1 million for capital improvements
and  working capital for the facility. The 20% minority interest is owned by the
operators of  the  DuraTherm  facility,  each  of  which  has  entered  into  an
employment  agreement providing for incentive  compensation tied directly to the
financial performance  of the  facility. Operations  at the  facility have  been
suspended  until completion of the capital  improvements. The Company expects to
complete the capital improvements and resume operations in the second quarter of
1996.
 
    DuraTherm has a  patented thermal desorption  process that removes  volatile
gases and recovers oil from contaminated sludges generated by oil refineries and
processing operations. The oil recovered can be recycled. The thermal desorption
process  is effective on sludges  with a Btu content  of between 2,000 and 5,000
per ton. Most  incinerators and  cement kilns,  alternative processing  methods,
typically  cannot  cost-effectively handle  sludges with  Btu levels  within the
effective range  for  the thermal  desorption  process. The  DuraTherm  facility
provides  the Company a permitted site to demonstrate and use other technologies
including vitrification and ion exchange.
 
JOINT VENTURE AND COLLABORATIVE ARRANGEMENTS
 
    In order  to commercialize  its vitrification  technology more  rapidly  and
cost-effectively,  the Company has developed several important joint venture and
collaborative arrangements.  The following  is  a summary  of certain  of  these
relationships.
 
  VSL
 
    The Company has established a research and development relationship with the
VSL  of The Catholic  University in Washington,  D.C. pursuant to  which the VSL
provides ongoing research and development capabilities and technical services in
support  of  the  Company's  waste  cleanup  projects.  In  this   complementary
relationship,  the  VSL  provides  the  necessary  technology  and  research and
development support  while the  Company advances  the technology  to  commercial
application.
 
    The  VSL, a research facility with a staff  of 90 researchers, is one of the
leading  research  centers  in  the   world  for  glass  technology,   including
vitrification.   The  laboratories   at  the   VSL  are   equipped  with  highly
 
                                       24
<PAGE>
sophisticated analytical  tools  which  enable  the  researchers  to  perform  a
comprehensive array of analyses. The VSL's research and development capabilities
include  waste characterization, testing of  radioactive waste-loaded glasses to
evaluate glass durability,  processability and  leachability, glass  dissolution
computer  modeling,  batch  melting and  the  study  of ion  exchange  media for
removing specific contaminants from liquid waste streams. Various DuraMelter-TM-
models have been designed and constructed at the VSL for use by the staff of the
VSL in its  research and  analytical work. In  addition, the  facility is  fully
licensed  for radioactive  and hazardous materials  research. The VSL  is led by
Pedro B. Macedo, Ph.D. and Theodore A. Litovitz, Ph.D. who are the inventors and
owners of the technology  licensed exclusively to the  Company for ion  exchange
and  the vitrification  of radioactive, hazardous,  mixed and  other wastes. See
"Business -- Patents and Other Intellectual Property Rights."
 
    In addition to being  the source of the  vitrification technologies used  by
the  Company, the VSL provides ongoing services to the Company in support of its
waste treatment projects. The  VSL conducts expert  waste composition and  glass
treatability  studies before  any project is  commenced, assists  in the initial
test melt phase of each  project and works with  the Company's engineers in  the
design   adaptation  of   the  DuraMelter-TM-   technology  to   fit  the  waste
characteristics of  each new  cleanup  project. In  addition, the  VSL  conducts
ongoing research and development into improvements on the existing vitrification
technologies  and into entirely new  vitrification techniques, serving in effect
as the research and development arm of the Company. The primary advantage to the
Company  from  its  relationship  with  the   VSL  is  the  access  to   leading
vitrification  technologies and ongoing vitrification research without having to
incur the ongoing overhead and administrative expenses if such capabilities were
in house.
 
    In return,  the  Company  provides  ongoing  project  funding  for  research
conducted at the VSL on behalf of the Company. During 1994 and 1995, the Company
paid  $1.9  million  and  $789,000, respectively,  in  research  and development
funding to  the VSL.  For Company  waste  cleanup projects  in which  the  VSL's
technical  services are utilized by  the Company, the Company  pays the VSL on a
time and expense basis and includes the estimated cost for such services in  its
formal  bid proposal.  The VSL  is a not-for-profit  institution so  it does not
include extra fees or percentage profits in its cost estimates.
 
  BNFL
 
    On November 7, 1995, the Company and BNFL entered into a strategic  alliance
agreement.  BNFL is the U.S.  subsidiary of British Nuclear  Fuels plc, a United
Kingdom-based  company  with  annual   revenues  of  approximately  $2   billion
worldwide.  British  Nuclear  Fuels plc  is  one  of the  largest  processors of
radioactive waste in the world and is  one of only two companies worldwide  with
commercial  experience  in  processing  and  stabilizing  high-level radioactive
wastes. The strategic  alliance with  BNFL enhances the  Company's prospects  of
obtaining major DOE waste treatment projects such as Hanford and Idaho and opens
opportunities  for international  expansion. BNFL  has been  active in  the U.S.
radioactive waste market for the past five years, including being selected as  a
member  of the team to  manage the DOE's nuclear  waste facility in Rocky Flats,
Colorado.
 
    Under the terms of the strategic alliance, the Company and BNFL have  agreed
to  jointly pursue up to five major DOE waste treatment projects, with the first
project being the separation and  vitrification of high-level radioactive  waste
at  the DOE's Hanford, Washington facility.  The terms of the strategic alliance
provide that BNFL pays to  the Company a fee of  $1.0 million each time the  two
companies  agree  to  exclusively pursue  a  waste treatment  project.  Upon the
execution of the  strategic alliance  agreement, the Company  received the  $1.0
million  fee for  its agreement to  pursue the Hanford  project exclusively with
BNFL. See "Business -- Status of Current and Potential Waste Treatment  Projects
- --  Hanford Tank Waste Remediation System Project," and "-- Idaho Advanced Mixed
Waste Treatment Project."
 
    As part  of the  strategic  alliance, BNFL  invested  $10.0 million  in  the
Company  in the form of a  convertible debenture. The debenture accrues non-cash
interest during the first  five years at the  one-year London Interbank  Offered
Rate  (LIBOR) and is convertible at the  option of BNFL into 1,381,575 shares of
the Common Stock prior to November 7, 2000. If the debenture is not converted or
extended, the Company must repay principal and interest in installments over the
five year period beginning on November 8, 2000. BNFL also agreed to provide  the
Company  with  research  and  development  funding  of  at  least  $500,000  per
 
                                       25
<PAGE>
year over the next five  years. The two parties will  mutually agree on how  the
research  and development funding will be spent, but the Company will retain the
rights to the vitrification processes that it develops through this funding. The
Company has  agreed  as  part  of  the  strategic  alliance  to  sublicense  its
radioactive  waste vitrification technologies to BNFL for use only in the United
Kingdom.
 
  DURACHEM
 
    In September 1994, the Company formed  a joint venture with Chem-Nuclear  to
design,  construct and  operate vitrification  facilities to  process commercial
radioactive waste  for disposal,  including  low-level radioactive  wastes  from
nuclear   power   plants,  hospitals,   research  laboratories   and  industrial
facilities.  The  joint  venture  entity,  called  DuraChem,  is  55%  owned  by
Chem-Nuclear   and  45%  by  the  Company.  The  joint  venture  represents  the
combination of  the Company's  proprietary  vitrification technology  and  Chem-
Nuclear's  22 years  of experience in  providing radioactive  waste handling and
processing services.  DuraChem will  first pursue  the disposal  market for  ion
exchange  resins  which  are  generated  by  nuclear  power  plants.  The  first
vitrification facility of this joint venture is located at Chem-Nuclear's  waste
processing  center  at  Barnwell,  South Carolina.  The  need  for  the services
provided by  DuraChem  was  created  by the  closure  of  nationally  accessible
low-level  radioactive waste disposal  sites and the delay  by state compacts in
opening new  regional  sites.  The  scarcity of  disposal  capacity  has  forced
commercial  generators of  low-level radioactive waste  to store  their waste at
their facilities until  regional sites are  opened. See "Business  -- Status  of
Current and Potential Waste Treatment Projects -- DuraChem Facility in Barnwell,
South Carolina."
 
  VITRITEK
 
    Through   a  joint  venture   with  Vitritek  Holdings   Company  L.L.C.,  a
privately-held entity, the Company has extended its vitrification technology  to
non-radioactive  wastes. The joint venture entity, called Vitritek, is 50% owned
by each of the Company and  Vitritek Holdings Company L.L.C. The joint  venture,
formed  in December 1993, represents the consolidation of co-licensing rights to
non-radioactive vitrification technologies  previously acquired  by the  Company
and  Vitritek  Holdings Company  L.L.C.  Under the  terms  of the  joint venture
arrangement, all funding requirements and all profits are shared equally.
 
    In November 1994, Vitritek,  along with the  VSL, completed a  demonstration
project for the White House in Washington, D.C. converting approximately one ton
of  asbestos-laden construction debris  from the White  House renovation project
into recyclable  glass.  Vitritek was  awarded  its  first, and  only  to  date,
commercial  subcontract  in  September 1994  by  WSRC to  conduct  a comparative
vitrification study on asbestos materials at the Savannah River site in order to
determine which of two melting technologies is better suited for converting  the
Savannah  River asbestos to glass. In  the study, the Company conducted parallel
tests using joule-heated  and plasma-arc furnaces  to vitrify about  25 tons  of
asbestos-laden waste material.
 
TECHNICAL SUPPORT SERVICES
 
    The  Company has  over 450 engineers,  consultants and  technicians, some of
whom are full-time  employees and the  balance of whom  are contract  employees.
These  employees support and  complement the Company's  waste treatment services
and also provide highly specialized technical support services for the Company's
customers. This  business  provides  a  consistent source  of  revenue  and  the
necessary  complementary expertise for  the Company to  expand and diversify its
waste treatment  technologies  business  in the  future.  The  primary  services
provided   by  the  Company  include  staff  augmentation  and  outage  support,
principally to assist nuclear power plants during regular maintenance shutdowns,
environmental and computer  consulting, and environmental  safety training.  The
Company  provides these technical services either as  a prime contractor or as a
subcontractor to a  diverse group  of government  agencies, electric  utilities,
industrial  facilities and commercial  businesses including the  DOE, Duke Power
Company, New York Power Authority, UNISYS Corporation and WSRC.
 
  STAFF AUGMENTATION AND OUTAGE SUPPORT SERVICES
 
    The Company  provides  trained  personnel to  assist  nuclear  power  plants
undergoing    periodic   refueling,   maintenance   outages,   construction   or
decommissioning. There  are 119  nuclear power  generating units  in the  United
States, of which 108 are operational. To control costs, utilities maintain their
permanent staffs at the
 
                                       26
<PAGE>
level  needed for steady-state power operations. They supplement their full-time
staffs during refueling and maintenance outages with skilled contract personnel.
Every 12  to  24  months, nuclear  power  plants  are shut  down  for  scheduled
maintenance  that typically takes  30 to 90 days.  This shutdown and maintenance
operation costs the nuclear power facility  on average $1 million for every  day
it  is closed. Accordingly, there is a strong economic incentive for the nuclear
power facilities to hire trained and experienced personnel for these maintenance
operations in order  to complete  the servicing  as quickly  and efficiently  as
possible.  The Company's  trained technicians  and personnel  are experienced in
outage support procedures and are effective  at helping to minimize the cost  of
the power facilities' down time.
 
    The  offering  of services  for operating  nuclear  power plants  provides a
considerable market for the  Company, despite the fact  that no new plants  have
been  ordered in over  10 years. The  demand for the  Company's services results
from the  extensive  overhaul required  to  extend  the life  of  aging  plants,
replacement of major components of existing plants, startup of plants recovering
from  long-term shutdown,  modifications to  the plants  resulting from changing
legislation and the decommissioning of plants that have reached the end of their
useful lives.
 
    The Company's largest customer for staff augmentation services is Duke Power
Company, which accounted for approximately  23% of the Company's total  revenues
in  1994 and 1995. Duke  Power currently has seven  nuclear power units at three
sites. Under a  series of  contracts between the  Company and  Duke Power  which
expire between 1997 and 1998, the Company provides a group of technicians to the
Duke  Power system  year-round and provides  additional personnel  to Duke Power
during planned maintenance outages. Other  nuclear power utilities to which  the
Company provides augmentation and outage support services include New York Power
Authority, Tennessee Valley Authority, PECO Energy, Vermont Yankee Power Company
and Southern Nuclear Operating Company.
 
  ENVIRONMENTAL AND COMPUTER CONSULTING SERVICES
 
    The  Company provides extensive environmental consulting services to clients
in  the   areas   of  environmental   remediation,   facility   decommissioning,
Occupational  Safety and  Health Act  ("OSHA") and  EPA compliance  audits, site
characterization, licensing and permitting and air quality and emission studies.
The Company either supplies professionals and technical personnel to  supplement
client  staffs or assumes responsibility for entire projects. Included among the
Company's available  personnel for  such environmental  consulting projects  are
chemical,  civil  and  environmental  engineers,  certified  health  physicists,
chemists,  toxicologists,  safety  and  health  experts,  regulatory  compliance
specialists,  remediation experts,  radiological control  technicians, hazardous
material technicians,  decontamination  experts  and others.  The  Company  also
supplies  professionals and technical specialists in a wide range of scientific,
engineering, data processing and  communications disciplines. These  individuals
perform  computer  consulting services  such as  program assessment/development,
computer  software  development,   quality  assurance  audits,   non-destructive
examination  and computer training for a broad base of clients. In January 1996,
GTS  Duratek  acquired  Analytical   Resources,  Inc.,  a  small   environmental
consulting  firm that  has been  involved in  many DOE  consulting projects. The
Company's management believes  that this acquisition  adds senior  environmental
management and consulting resources to the Company.
 
  ENVIRONMENTAL SAFETY TRAINING
 
    The  Company  provides  radiation protection  and  hazardous  waste training
services nationwide. During  1995, the Company's  training specialists  prepared
candidates,  consisting  of health  physics  technicians and  professionals from
nuclear power plants, universities and laboratories nationwide, for the National
Registry of  Radiation Protection  Technologists and  American Board  of  Health
Physics  certification  examinations.  The  Company's  training  programs enable
customers to  realize  cost  savings through  increased  worker  competence  and
productivity,  enhanced workplace safety and improved compliance with regulatory
requirements.
 
CUSTOMERS
 
    The Company  derives  revenues  related  to  its  proprietary  vitrification
technologies   principally  through  subcontracts  with  a  combination  of  DOE
contractors and subcontractors including WSRC and FERMCO. Revenues derived  from
DOE-related  subcontracts  represented 22.7%  and 35.0%  of the  Company's total
 
                                       27
<PAGE>
revenues during  1994 and  1995, respectively.  The Company  provides  technical
support  services to a diverse group  of government agencies, including the DOE,
the  DOD,  the  EPA  and  state  environmental  protection  agencies,   electric
utilities,  including Duke  Power Company,  New York  Power Authority, Tennessee
Valley Authority,  Vermont Yankee  Nuclear Power  Corporation, PECO  Energy  and
Southern  Nuclear Operating  Company, and  industrial facilities  and commercial
businesses, including UNISYS  Corporation. Revenues  from Duke  Power, WSRC  and
FERMCO accounted for approximately, 22.6%, 17.4% and 16.1%, respectively, of the
Company's  revenues for 1995. The Company has multiple contracts with Duke Power
which expire between 1997 and 1998  and pursuant to which it provides  technical
support services and personnel.
 
SALES AND MARKETING STRATEGY
 
    The  Company's operations to date have  provided it with extensive knowledge
of DOE and  other waste stream  composition and the  factors that influence  the
remediation  of those waste streams. The Company's internal sales force uses and
will continue to use that knowledge  and operating experience to strengthen  the
Company's  competitive position  when pursuing  DOE and  other waste remediation
projects. In addition, through its collaborative arrangements, the Company  will
seek  to  utilize  complementary technical  expertise,  marketing  resources and
commercial experience of the other parties to develop additional business in its
primary markets,  expand its  capabilities in  handling a  greater diversity  of
waste streams and replicate its operating model to pursue international markets.
The Company pursues markets where it can be the most cost-effective processor of
the  waste due to its technologies, geographical  proximity to a waste stream or
government regulation.
 
    In its  technical  support  services  business, GTS  Duratek  will  seek  to
strengthen  its relationships  with its  large utility  customers, such  as Duke
Power Company,  Tennessee Valley  Authority, PECO  Energy and  Southern  Nuclear
Operating  Company, which  are significant  contributors to  the Company's total
revenues. For its consulting  and staff business, the  Company is also  pursuing
arrangements  in which  single-nuclear-unit utilities can  form users' alliances
with the Company as the sole staff support contractor. These arrangements  would
emulate  the Company's  contracts with  large, multiple-nuclear-plant utilities.
The Company is also  pursuing opportunities with  utilities that are  downsizing
and  outsourcing  service  work  as  well  as  DOE  sites  that  are privatizing
departments such as training and  radiological controls. To enhance the  overall
profitability  of  the  technical  support  services  business,  the  Company is
focusing on increasing  market share in  environmental and computer  consulting,
radiation  instrument services and  environmental safety training,  all of which
generate relatively higher  profit margins  than staff  augmentation and  outage
support.
 
ENVIRONMENTAL MATTERS
 
 ENVIRONMENTAL LAWS AND REGULATIONS CREATING A DEMAND FOR THE COMPANY'S WASTE
 TREATMENT TECHNOLOGIES
 
    Various  environmental protection laws have  been enacted and amended during
recent  decades  in  response  to  public  concern  over  the  environment.  The
operations of the Company's customers are subject to these evolving laws and the
implementing  regulations. The Company  believes that the  obligations to comply
with the requirements  of the following  laws contribute to  the demand for  its
services:
 
    The  AEA and the Energy Reorganization Act of 1974 (the "ERA") authorize the
NRC to  regulate  the  receipt,  possession, use  and  transfer  of  radioactive
materials,   including  "source  material,"   "special  nuclear  material,"  and
"byproduct material."  Pursuant to  its authority  under the  AEA, the  NRC  has
adopted  regulations  that  address  the management  and  disposal  of low-level
radioactive waste  and  that  require  the  licensing  of  commercial  low-level
radioactive waste disposal sites.
 
    The  storage and  disposal of  high-level nuclear  waste are  subject to the
requirements of the Nuclear  Waste Policy Act, as  amended by the Nuclear  Waste
Policy  Act  Amendments.  These  statutes regulate  the  disposal  of high-level
nuclear waste  by  establishing procedures  and  schedules for  siting  geologic
repositories  for  such  waste.  The  statutes  also  direct  EPA  to promulgate
environmental standards  for  the  disposal of  high-level  nuclear  waste,  and
require  the  NRC  to  promulgate  standards  covering  the  licensing  of waste
repositories. The  NRC  has issued  regulations  that address  the  storage  and
disposal of high-level nuclear waste.
 
    The  Uranium Mill Tailings Radiation Control  Act ("UMTRCA") and the Uranium
Mill Tailings  Remedial Action  Amendments Act  are intended  to protect  public
health and the environment from hazards
 
                                       28
<PAGE>
associated with uranium ore milling wastes at active and inactive uranium mills.
UMTRCA  designates specific inactive  mill sites for  remedial action, and gives
the DOE the responsibility for carrying out remedial actions at these sites.
 
    The locations  for future  low-level radioactive  waste disposal  facilities
also  may be  affected by  the Low-Level  Radioactive Waste  Policy Act  of 1980
("LLRWPA") and the  Low-Level Radioactive Waste  Policy Amendments Act  ("LLRWPA
Amendments"). The LLRWPA addresses the siting of new low-level radioactive waste
disposal facilities and establishes that each state is responsible for providing
disposal  capacity  for most  low-level  commercial radioactive  waste generated
within its borders. The statute also  encourages groups of states to enter  into
compacts  providing for the  development and operation  of low-level radioactive
waste disposal facilities. Incentives for the formation of interstate  compacts,
and  the deadlines and procedures which states must meet in designating disposal
facilities were modified by the LLRWPA  Amendments. At the present time, no  new
radioactive  waste disposal  facilities have been  opened by  state compacts and
none are expected to open in the near future.
 
    RCRA  provides  a  comprehensive  framework   for  the  regulation  of   the
generation,  transportation, treatment, storage and disposal of hazardous waste.
The intent  of RCRA  is  to control  hazardous wastes  from  the time  they  are
generated  until  they  are  properly recycled  or  treated  and  disposed. RCRA
prohibits improper  hazardous  waste disposal  and  imposes criminal  and  civil
liability  for  failure  to comply  with  its requirements.  RCRA  requires that
hazardous waste  generators,  transporters  and  operators  of  hazardous  waste
treatment,  storage  and  disposal  facilities  meet  strict  standards  set  by
government agencies. In certain circumstances,  RCRA also requires operators  of
treatment,  storage  and  disposal facilities  to  obtain and  comply  with RCRA
permits. The Land Disposal Restrictions developed under the Hazardous and  Solid
Waste Amendments of 1984 prohibit land disposal of specified wastes unless these
wastes  meet  or  are treated  to  meet Best  Demonstrated  Available Technology
("BDAT") treatment standards, unless certain exemptions apply.
 
    TSCA provides EPA with  the authority to  regulate over 60,000  commercially
produced   chemical   substances.   EPA   may   impose   requirements  involving
manufacturing, record  keeping, reporting,  importing and  exporting. TSCA  also
established  a comprehensive regulatory  program for PCBs  which is analogous to
the RCRA program for hazardous waste.
 
    The Clean  Water  Act  establishes standards,  permits  and  procedures  for
controlling the discharge of pollutants from industrial and municipal wastewater
sources.
 
    The  Clean Air Act of  1970, as amended (the  "Clean Air Act"), empowers the
EPA to  establish  and enforce  ambient  air  quality standards  and  limits  of
emissions of pollutants from facilities. This has resulted in tight control over
emissions from technologies like incineration.
 
    The  Comprehensive Environmental Response, Compensation and Liability Act of
1980, as amended ("CERCLA" or "Superfund"), and subsequent amendments under  the
Superfund   Amendments  and  Reauthorization   Act  ("SARA")  impose  continuing
liability upon generators of hazardous substances (among other parties) and such
potential liability may significantly  affect a generator's  decision on how  to
dispose  of the wastes. The Community  Right-to-Know mandate established by SARA
requires full  disclosure  of  all  environmental releases  to  the  public  and
contributes  to public awareness and  activism regarding corporate environmental
management issues. To the  extent a generator's waste  can be reported as  being
recycled,   potential  liability  and  public  pressure  can  be  eliminated  or
significantly reduced.
 
    CERCLA and SARA, as  implemented by the  National Contingency Plan,  provide
for  the investigation and remediation of sites containing hazardous substances.
The  Superfund  program's  regulations  require  that  any  remediation  of  the
hazardous  substances meet applicable and relevant and/or appropriate regulatory
requirements. Superfund's  remedy selection  process includes  a preference  for
innovative  technology. Superfund also establishes  strict liability for parties
who generated  or transported  hazardous substances  or owned  and operated  the
sites containing them. This may create a strong incentive to avoid on-site waste
treatment  in favor of utilizing technologies like the Company's waste treatment
technologies, which can, in certain instances, effectively recycle wastes.
 
                                       29
<PAGE>
    The Pollution Prevention Act of  1990 establishes pollution prevention as  a
national  objective, naming it a primary  goal wherever feasible. The Act states
that if  pollution cannot  be  prevented, materials  should  be recycled  in  an
environmentally safe manner.
 
    Under  the mandate of the Federal  Facility Compliance Act ("FFCA"), the DOE
is currently  engaged in  a program  to treat  and dispose  of the  mixed  waste
currently  stored at its facilities. The FFCA required DOE to develop and comply
with treatment and  disposal plans for  each of its  facilities and charges  DOE
with  developing treatment and disposal capacity  for these wastes where it does
not currently exist. The plans must also  address the need to treat and  dispose
of mixed wastes generated from the remediation of contaminated DOE sites.
 
 ENVIRONMENTAL LAWS AND REGULATIONS AFFECTING THE USE OF THE COMPANY'S WASTE
 TREATMENT TECHNOLOGIES
 
    Pursuant to the mandate of the AEA and the ERA, NRC regulations and guidance
address  the classification and  management of low-level  radioactive waste. The
NRC regulations also govern the technical, monitoring and safety-related aspects
of developing  and operating  low-level radioactive  waste disposal  facilities.
Pursuant  to its authority under the AEA, the NRC also has established licensing
requirements and operating procedures for such facilities. The NRC  requirements
address  siting criteria, site stability,  the development and implementation of
institutional  controls   for   the   facility   (e.g.,   access   restrictions,
environmental monitoring and site maintenance), facility operation, closure, and
site stabilization.
 
    Under  RCRA, wastes are classified as  hazardous either by specific listings
or  because  they  display  certain  hazardous  characteristics.  Under  current
regulations,  waste residues derived from  listed hazardous wastes are generally
considered to be  hazardous wastes  unless they  are delisted  through a  formal
rulemaking process that may last a few months to several years. For this reason,
waste  residue that is generated by the treatment of listed hazardous wastes but
which has  no  beneficial  use,  including  waste  treated  with  the  Company's
vitrification  technologies, may be considered  a hazardous waste without regard
to the fact that  this waste residue may  be environmentally benign.  Subsequent
management  of  such waste  residue would  be subject  to full  RCRA regulation,
including the prohibition against land disposal without treatment in  compliance
with  BDAT. The RCRA regulation classifying  such waste residue as hazardous has
been overturned  by the  District of  Columbia Court  of Appeals,  but has  been
temporarily  reinstated until  the EPA  develops a  revised regulatory approach.
Under EPA's proposed  Hazardous Waste Identification  Rule, listed wastes  would
leave  the hazardous waste regulatory system if they met specified concentration
limits for  hazardous constituents.  The Company's  ownership and  operation  of
vitrification  facilities also  exposes the  Company to  potential liability for
cleanup of releases of hazardous wastes under RCRA.
 
    If the Company  engages in  the transportation of  radioactive materials  it
will  be subject to  the requirements of  the Hazardous Materials Transportation
Act, as amended by  the Hazardous Materials  Transportation Uniform Safety  Act.
Pursuant  to  these statutes,  the  United States  Department  of Transportation
regulates the  transportation  of  hazardous  materials,  including  radioactive
materials,  in  commerce. Shippers  and carriers  of radioactive  materials must
comply with both the general requirements for hazardous materials transportation
and with specific requirements for the transportation of radioactive  materials.
If  the Company engages in the storage  and disposal of high-level nuclear waste
it may be subject  to the Nuclear  Waste Policy Act, as  amended by the  Nuclear
Waste Policy Act Amendments.
 
    CERCLA  effectively imposes strict, joint  and several liability upon owners
or operators of facilities where a release of hazardous substances has occurred,
upon parties  who generated  hazardous  substances that  were released  at  such
facilities  and upon  parties who arranged  for the  transportation of hazardous
substances  to  such  facilities.  The  Company's  ownership  and  operation  of
vitrification facilities on-site expose the Company to potential liability under
CERCLA for releases of hazardous substances into the environment at those sites.
In  the  event that  off-site  storage or  disposal  facilities utilized  by the
Company for  final disposition  of the  glass and  resulting residues  from  the
Company's vitrification process are targeted for investigation and cleanup under
CERCLA, the Company could incur liability as a generator of such materials or by
virtue  of having  arranged for their  transportation and  disposal. The Company
designs its DuraMelters-TM- to minimize  the potential for release of  hazardous
substances into the environment. In
 
                                       30
<PAGE>
addition,  the Company has  developed plans to  manage and minimize  the risk of
CERCLA  or  RCRA  liability,  including  the  training  of  operators,  use   of
operational  controls  and structuring  of its  relationships with  the entities
responsible for the handling of waste materials and by-products.
 
    The Clean Air Act imposes strict  requirements upon owners and operators  of
facilities which discharge pollutants into the environment. Although the Company
believes  that  its  proprietary  off-gas  treatment  system  effectively  traps
particulates and  prevents  hazardous emissions  from  being released  into  the
environment,  which releases would violate the Clean  Air Act, the Clean Air Act
may require a permit  prior to the construction  and operation of the  Company's
facilities and may require additional controls.
 
    The  Clean  Water  Act  establishes standards,  permits  and  procedures for
controlling the discharge of pollutants from industrial and municipal wastewater
sources. The Company believes that DuraMelters-TM- generally will not be subject
to the  water pollution  control requirements  of the  Clean Water  Act  because
DuraMelters-TM-  are designed to have no residual wastewater discharge. However,
the  Clean  Water  Act's  standards  permits  and  procedures  are   potentially
applicable  to wastewater treatment  systems designed by  the Company, using its
ion exchange technology.
 
    OSHA provides for the establishment of standards governing workplace  safety
and  health  requirements,  including setting  permissible  exposure  levels for
hazardous chemicals  which  may be  present  in  mixed wastes.  The  Company  is
required  to follow OSHA standards, including the preparation of material safety
data sheets, hazardous response training and process safety management. The  NRC
has set regulatory standards for exposure to radioactive materials.
 
    To  the extent that the Company is  engaged in the processing or disposal of
mixed waste,  the radioactive  components  are subject  to the  NRC  regulations
promulgated  under  the AEA,  while the  hazardous components  of the  waste are
regulated by the EPA under RCRA.
 
    Company facilities  may  have  to  obtain  permits  under  state  laws  that
correspond to the Clean Water Act and the Clean Air Act. The necessity to obtain
such  permits depends  upon the facility's  location and  the expected emissions
from the facility. Additional state licenses or approvals may also be required.
 
    Operators of hazardous waste treatment, storage and disposal facilities  are
required to obtain RCRA Part-B permits from the EPA or from states authorized to
implement  the  RCRA program.  Obtaining such  permits is  a lengthy  and costly
process that requires regulatory inspection and approval of, among other things,
the facility design, equipment and operating plans and procedures. In  addition,
applicants  for a RCRA permit for a treatment, storage or disposal facility must
submit detailed information  regarding all  past waste  management practices  at
that  facility  and may  be  required to  undertake  corrective action  for past
contamination of the site. The Company's  DuraTherm facility in San Leon,  Texas
is  a RCRA  Part-B permitted facility.  The Company has  developed procedures to
ensure compliance  with  RCRA  permit  provisions  at  the  DuraTherm  facility,
including  procedures for ensuring appropriate  waste acceptance and scheduling,
waste tracking, manifesting and reporting, and employee training.
 
COMPETITION
 
    The market for the Company's  waste treatment technologies is  characterized
as  the treatment and stabilization of certain radioactive, hazardous, mixed and
other wastes.  The Company  is  aware of  some  competition from  several  large
companies  and numerous  small companies. Any  of such companies  may possess or
develop technologies superior  to those  of the  Company. While  the Company  is
aware  of competition from companies  with similar waste treatment technologies,
the primary competition comes from  companies which provide waste treatment  and
disposal  services. The predominant waste treatment and disposal methods include
landfilling, deep-well injection, on-site containment and incineration or  other
thermal  treatment methods. Competition  is based primarily  on cost, regulatory
and permit restrictions, technical performance, dependability and  environmental
integrity. The Company believes that it will be able to compete favorably on the
basis  of  these  factors.  The  Company  also  believes  that  it  has  several
competitive  advantages   over  its   competitors  including   its   proprietary
vitrification technologies, integrated approach to waste treatment, demonstrated
commercial  success of  its technologies  and strategic  alliances. Many  of the
 
                                       31
<PAGE>
Company's   competitors  have  substantially  greater  financial  and  technical
resources than the Company and there can be no assurance that one or more of the
Company's competitors  do  not  possess  or will  not  develop  waste  treatment
technologies that are superior to those of the Company.
 
    In  its  technical support  services, the  Company's competitors  range from
major national and  regional environmental  service and  consulting firms  which
have  large environmental remediation  staffs to small local  firms. Many of the
major national  and regional  environmental service  and consulting  firms  have
greater  financial,  management and  marketing resources  than the  Company. The
availability of  skilled technical  personnel, quality  of performance,  safety,
diversity of services and price are the key competitive factors.
 
RESEARCH AND DEVELOPMENT ACTIVITIES
 
    The Company's research and development activities are conducted primarily by
the  VSL for  the enhancement  of the  Company's existing  vitrification and ion
exchange technologies  or the  introduction of  new vitrification  technologies.
During  1995, 1994 and 1993, research  and development activities were conducted
at the VSL  under contracts totaling  $789,000, $1.9 million  and $1.3  million,
respectively.  The Company did not incur any additional research and development
costs during  those  years. In  connection  with various  Company  contracts  or
subcontracts,  the VSL conducts  research and development  under fixed-price and
cost-plus-fixed fee contracts. Under these contracts, the research is supervised
by Drs. Macedo and Litovitz and all inventions and discoveries are owned by them
and licensed to the Company under  the exclusive license agreement. The  Company
expects  to spend a significant portion  of the research and development funding
provided by BNFL with the VSL. See "Business -- Joint Venture and  Collaborative
Arrangements -- VSL" and "-- BNFL."
 
PATENTS AND OTHER INTELLECTUAL PROPERTY RIGHTS
 
    The  Company  licenses all  of the  patent  and other  intellectual property
rights to its proprietary vitrification  and other waste treatment  technologies
from the inventors of such technologies. Drs. Macedo and Litovitz, the inventors
of  the  Company's  vitrification  and ion  exchange  technologies,  license the
patents and proprietary  rights to  such technologies  to the  Company under  an
exclusive  license agreement. Under this agreement,  which was renewed in August
1992, Drs. Macedo and  Litovitz collectively receive  annual royalties equal  to
the  greater of (i) $100,000 or (ii) 1%  to 3% of net revenues, depending on the
level of net revenues, which are  generated by the Company from the  application
of  the licensed  technology to encapsulate  liquids and solids  in porous glass
matrices, remove radioactive and hazardous materials from liquids and  stabilize
low-level  radioactive or mixed waste. During the three years ended December 31,
1995, the Company  paid Drs.  Macedo and  Litovitz the  $100,000 minimum  annual
royalty each year. The exclusive license agreement with Drs. Macedo and Litovitz
expires  upon the expiration of the last patent covered by the license agreement
which is currently  in the  year 2012. Drs.  Macedo and  Litovitz also  received
options to purchase 250,000 shares of the Common Stock at the time the exclusive
license   was  renewed.   The  exclusive  license   agreement,  which  currently
encompasses 22 patents  and one  patent application, also  includes any  process
patents or technology rights related to the licensed field which is subsequently
developed by the VSL or Drs. Macedo and Litovitz.
 
    Drs.  Macedo  and Litovitz  own all  of the  vitrification and  ion exchange
patents relating to the research and  development work conducted by them at  the
VSL.  The  Catholic  University  of  America has  agreed  that  all  patents and
technologies developed at the VSL belong to Drs. Macedo and Litovitz and not  to
the  University.  In  turn, Drs.  Macedo  and Litovitz  exclusively  license the
vitrification technology rights and process patents developed by them at the VSL
to the Company.
 
    The rights to the proprietary vitrification technology for the treatment  of
non-radioactive  hazardous  wastes and  the  treatment of  radioactive  waste in
Germany are held by  Vitritek and are  licensed to Vitritek  by Drs. Macedo  and
Litovitz.  Under the  terms of this  license agreement,  the Company's allocable
share of revenues from the joint venture are included within the royalty payment
obligations under the Company's exclusive license agreement with Drs. Macedo and
Litovitz for the vitrification of radioactive and mixed wastes.
 
                                       32
<PAGE>
    The Company also licenses  the rights to  the thermal desorption  technology
used  in the processing of petrochemical waste by DuraTherm from the inventor of
such technology. The Company  and DuraTherm are  co-licensees under the  license
agreement  and  are  collectively  obligated  to  pay  to  the  inventor  of the
technology an annual royalty payment equal to the greater of (i) $50,000 or (ii)
1.0% of the net revenues generated from the operation of the desorber  equipment
(excluding  net  revenues generated  from  equipment acquired  in  the DuraTherm
acquisition) incorporating the  technology and  5.0% of  the sales  of any  such
equipment.  Once certain aggregate royalty  obligations have been satisfied, the
royalty payment structure will be modified. The license agreement grants to  the
Company   and  DuraTherm  the  exclusive  rights  to  such  technology  and  any
subsequently developed  related technology  and provides  that any  subsequently
developed  unrelated  technology  which results  from  research  and development
funded or  sponsored by  the Company  or  DuraTherm shall  be assigned  to  such
entities.  The  license agreement  currently  covers three  patents  relating to
thermal desorption, one pending patent and a European patent application.
 
    DuraTherm recently received an attorneys' letter on behalf of a company that
owns certain  thermal desorption  patent rights.  The letter  offers to  license
these   rights  to  DuraTherm.  These  attorneys  have  brought  several  patent
infringement cases relating to these patents which are currently pending  before
federal  courts or have  been settled upon the  execution of license agreements.
Although the letter does not assert patent infringement claims, no assurance can
be given that infringement claims will not be asserted in the future. Management
of the Company  and special  patent counsel for  the Company  have reviewed  the
matter  and have determined that most of  the patents cited in the letter relate
to waste  streams containing  contaminants that  DuraTherm does  not process  or
intend  to process and that  no infringement of these  patent claims exists. Two
patent claims cited in the letter are so broad as to cover many waste  treatment
processes.  With respect to these patent claims, GTS Duratek has been advised by
its special patent counsel that it is doubtful whether the scope of these patent
claims can be expanded to cover DuraTherm's process in view, among other things,
of a  significant body  of prior  art. Accordingly,  management of  the  Company
believes that the ultimate outcome of this matter is unlikely to have a material
adverse effect on DuraTherm or on the Company taken as a whole.
 
    The Company requires each of its employees to enter into standard agreements
pursuant  to  which the  employee agrees  to  keep confidential  all proprietary
information of  the Company  and to  assign to  the Company  all rights  in  any
proprietary  information or technology  developed by the  employee during his or
her employment or  made thereafter as  a result of  any inventions conceived  or
work  done during such employment. Despite these precautions, it may be possible
for a third party to copy or  otherwise obtain and use the Company's  technology
without  authorization  or  to  develop  similar  technology  independently.  In
addition, effective patent  and trade  secret protection may  be unavailable  or
limited in certain foreign countries.
 
    DURASIL-Registered  Trademark- is a registered trademark held by the Company
and DuraMelter-TM- and DuraGem-TM- are common law trademarks.
 
EMPLOYEES
 
    As of December 31, 1995, the  Company employed 512 employees, including  403
field-assigned employees performing services for clients, 68 full-time technical
personnel  and 41 in finance and administration. The Company contracts with most
of the field-assigned personnel on an as-needed basis and such personnel are not
full-time employees of  the Company.  Due to  the seasonality  of the  technical
support  services  business, the  number  of field-assigned  employees generally
increases to  approximately  500 during  the  fall  peak outage  season  at  the
nation's  nuclear  power plants.  To date,  the Company  has been  successful in
attracting and retaining qualified technical personnel, although there can be no
assurance that this success will continue.  None of the Company's employees  are
subject  to a collective bargaining agreement. The Company has never experienced
a work stoppage and believes that its relations with its employees are good.
 
PROPERTIES
 
    The Company  leases approximately  14,200  square feet  of office  space  in
Columbia,  Maryland which  it uses as  its administrative  and general corporate
offices. The initial lease  term expired in 1995  but has been extended  through
November  1996. The Company  also leases 2,400  square feet of  space in Laurel,
Maryland,
 
                                       33
<PAGE>
which the  Company uses  as a  warehouse for  DURASIL-Registered Trademark-  ion
exchange  media  and related  equipment, and  4,800  square feet  in Pittsburgh,
Pennsylvania which houses the Company's instrument repair and rental facility.
 
    The Company  is outgrowing  its current  office facilities  and is  actively
seeking  new office,  research and  development and  warehouse facilities having
initial availability of approximately 35,000 square feet. The Company expects to
enter into a long-term lease in the  near future at lease rates per square  foot
comparable to what it is paying under its current lease arrangement.
 
    The   Company's  80%-owned  subsidiary,  DuraTherm,  owns  a  RCRA-permitted
hazardous waste recycling center located in San Leon, Texas that was  previously
operated by BEGCI. The facility is located on 14.5 acres of land and consists of
a  recycling center on 8.5 acres and  4,500 square feet of office and laboratory
space. The facility and the land are owned by DuraTherm.
 
LEGAL PROCEEDINGS
 
    From time to  time the Company  is a party  to litigation or  administrative
proceedings  relating to claims arising from its operations in the normal course
of business. Management of the Company, on the advice of counsel, believes  that
the  ultimate resolution of litigation currently  pending against the Company is
unlikely, either individually or  in the aggregate, to  have a material  adverse
effect on the Company's results of operations or financial condition.
 
                                       34
<PAGE>
                                   MANAGEMENT
 
    The  following table  sets forth the  executive officers,  key employees and
directors of the Company:
 
<TABLE>
<CAPTION>
                NAME                       AGE                                    POSITION
<S>                                    <C>          <C>
Daniel A. D'Aniello..................          49   Chairman of the Board of Directors
Robert E. Prince.....................          48   President, Chief Executive Officer and Director
Robert F. Shawver....................          39   Executive Vice President and Chief Financial Officer
Craig T. Bartlett....................          33   Controller and Treasurer
C. Paul Deltete......................          47   Senior Vice President, Environmental Operations and Support
Diane L. Leviski.....................          35   Vice President, Human Resources
Bradley W. Bowan.....................          34   Director of Engineering and Technology Development
Mark H. Clements.....................          41   Director of Technology Projects
William G. Greenman..................          47   Director of Business Development, Environmental Operations
Robert A. Hensel.....................          54   President of DuraTherm
Ian S. Howard........................          40   Project Director, DuraChem
James W. Orr.........................          38   Director of Outage Services
Christine L. Wruck...................          33   Director of Computer Services
William E. Conway, Jr................          46   Director
Jerome I. Feldman....................          67   Director
Steven J. Gilbert....................          48   Director
Martin M. Pollak.....................          68   Director
Earle C. Williams....................          66   Director
</TABLE>
 
    DANIEL A. D'ANIELLO has  been Chairman of  the Board and  a director of  the
Company  since January 1995. He  has been a Managing  Director for Carlyle since
1987. Mr.  D'Aniello was  Vice President,  Finance and  Development for  Mariott
Corporation,  a hospitality company,  from 1981 to 1987.  He currently serves on
the Board of  Directors for  Baker & Taylor,  Inc., a  wholesale distributor  of
books, and CB Commercial Real Estate Group, Inc., a commercial real estate firm.
Mr. D'Aniello is a magna cum laude graduate of Syracuse University, where he was
a  member of Beta  Gamma Sigma, and  a graduate of  the Harvard Business School,
where he was a Teagle Foundation Fellow.
 
    ROBERT E.  PRINCE has  been President  and Chief  Executive Officer  of  the
Company  since November 1990 and  a director since May  1991. He founded General
Technical Services, Inc., the  predecessor to the Company,  in October 1984  and
was  President and  Chief Executive  Officer from  1987 to  1990. Mr.  Prince, a
graduate of the U.S. Naval Academy, served as an officer on nuclear  submarines.
He  also has  a Masters  in Business Administration  from the  Wharton School of
Finance of  the University  of Pennsylvania.  Mr. Prince  is a  certified  naval
nuclear engineer.
 
    ROBERT F. SHAWVER has been the Executive Vice President of the Company since
May  1993.  He has  been the  Chief Financial  Officer and  Chief Administrative
Officer of the Company  since 1987. Mr.  Shawver was the  Vice President of  the
Company  from 1987 to 1993. He was also  the Controller of the Company from 1985
to 1987. Prior  to his  work at  the Company, he  was employed  by Deloitte  and
Touche  LLP  as  a  Certified  Public  Accountant  and  a  Certified  Managerial
Accountant. Mr.  Shawver holds  a Masters  of Business  Administration from  the
University of Maryland.
 
    CRAIG  T. BARTLETT  has served  as Treasurer  of the  Company since February
1996. He  has served  as  Controller and  Principal  Accounting Officer  of  the
Company since February 1993. He was Director,
 
                                       35
<PAGE>
Financial  Operations from  1991 to 1993  and Assistant Controller  from 1988 to
1991. Prior to  his work at  the Company,  Mr. Bartlett was  employed by  Arthur
Andersen  &  Co. LLP  as a  Certified  Public Accountant.  Mr. Bartlett  holds a
Masters of Business Administration from Loyola College of Maryland.
 
    C. PAUL DELTETE has been  Senior Vice President of Environmental  Operations
and  Support of  the Company  since January 1996.  Mr. Deltete  was President of
Analytical Resources, Inc. from 1984 to January 1996. Mr. Deltete holds a Master
of Science in Nuclear Engineering from the Rensselaer Polytechnic Institute  and
a  Bachelor of Science in Applied Mathematics  from the U.S. Naval Academy after
which he served as an officer on nuclear submarines.
 
    DIANE L. LEVISKI has been Vice  President of Human Resources of the  Company
since  February 1996. She was Director of  Human Resources from 1988 to 1996 and
Manager of Recruiting from 1985 to 1988. Ms. Leviski holds a Bachelor of Arts in
Psychology from Dickinson College.
 
    BRADLEY W. BOWAN has been Director of Engineering and Technology Development
and Chief Engineer of the Company since November 1993. Mr. Bowan was Manager  of
Project  Engineering  of the  VSL  from 1991  to 1993.  Mr.  Bowan holds  both a
Bachelor of Science and a Master  of Science in Ceramic Engineering from  Alfred
University.
 
    MARK  H. CLEMENTS  has been Director  of Technology Projects  of the Company
since March 1994 and was Director of Environmental Services of the Company  from
August  1993 to March 1994.  Mr. Clements was Senior  Program Manager for Martin
Marietta from  January 1990  to August  1993. Mr.  Clements holds  a Masters  of
Business  Administration from Harvard  University and is a  graduate of the U.S.
Naval Academy after which he served as an officer on nuclear submarines.
 
    WILLIAM G. GREENMAN has been Director of Business Development, Environmental
Operations of the Company since November  1990. Mr. Greenman was Vice  President
of  Operations of the Company  from January 1989 to  November 1990. Mr. Greenman
holds a  Bachelor  of Science  in  Radiological Health  Science  from  Manhattan
College and is a graduate of the U.S. Navy Nuclear Power School.
 
    ROBERT  A. HENSEL has  been President of DuraTherm  since November 1995. Mr.
Hensel was President  of Thermal Operations  and Vice President  of the  Midwest
Region for Chemical Waste Management, Inc. from 1991 to 1995. Mr. Hensel holds a
Bachelor of Science in Chemistry and Mathematics from Muskingum College.
 
    IAN S. HOWARD has been director of the DuraChem project since February 1995.
Mr.  Howard was director of the MAWS  Project from October 1993 to February 1995
and was Director of Operations and Engineering from 1987 to 1993. Mr. Howard  is
a Juris Doctor candidate at the University of Maryland School of Law and holds a
Bachelor  of Science in Business Management from the University of Maryland. Mr.
Howard is also a graduate of the U.S. Navy Nuclear Power School.
 
    JAMES W. ORR has been Director of Outage Services and Instrument Shop  since
May  1991. He  had been  acting director of  Health Physics  Service since March
1990.  Mr.  Orr  has  an  A.S.  in  Nuclear  Engineering  Technology  from   the
Pennsylvania State University.
 
    CHRISTINE L. WRUCK has been Director of Computer Services since August 1994.
Ms.  Wruck was Director of Staffing Services from August 1990 to 1994. Ms. Wruck
has an M.A.S. in  Human Resources Management from  The Johns Hopkins  University
and a Bachelor of Arts in History from The College of William and Mary.
 
    WILLIAM  E. CONWAY,  JR. has  been a director  of the  Company since January
1995. He has  been a Managing  Director of  Carlyle since 1987.  Mr. Conway  was
Senior  Vice President  and Chief  Financial Officer  of MCI  Communications, an
international telecommunications company, from 1984 to 1987. He currently serves
on the  Board of  Directors  for BDM  International,  Inc., a  professional  and
technical  services firm, Tracor, Inc., a defense electronics and services firm,
HighwayMaster  Communications,  Inc.,  a  communication  services  company,  and
several  privately held companies controlled by Carlyle. Mr. Conway received his
Bachelor of Arts  with a  concentration in  Economics and  Russian at  Dartmouth
College  and his Masters of Business Administration in Finance at the University
of Chicago.
 
                                       36
<PAGE>
    JEROME I. FELDMAN has been a director  since 1982 and served as Chairman  of
the  Board of  Directors of the  Company from 1985  until January 1995.  He is a
founder of, and since 1959 has been President and Chief Executive Officer and  a
director of National Patent. He has been Chairman of the Executive Committee and
a  director of Interferon Sciences, Inc., a biopharmaceutical company engaged in
the manufacture and  sale of Alferon  N Injection, since  1981; Chairman of  the
Executive  Committee  of General  Physics Corporation,  a provider  of personnel
training and technical support services to the domestic commercial nuclear power
industry and the DOE,  since 1988, and  a director of  such company since  1987;
Chief  Executive Officer, Chairman of the  Executive Committee and a director of
SGLG, Inc., a holding company,  since 1991; and a  director and a consultant  to
American  Drug Company, a generic drug distribution company, since January 1994.
He has  been  a Director  of  Hamilton  Financial Services,  Inc.,  a  financial
services  holding company since 1983.  Mr. Feldman is also  a Trustee of the New
England Colleges Fund and of Bard College.
 
    STEVEN J. GILBERT has been a director of the Company since January 1995.  He
has  been Managing General Partner of Soros Capital, L.P., the principal venture
capital and leveraged transaction  entity of the Quantum  Group of Funds,  since
1992.  Mr.  Gilbert  is  also  the  Managing  Director  of  Commonwealth Capital
Partners, L.P.,  a private  equity  investment fund,  and was  Managing  General
Partner until 1988 of Chemical Venture Partners, which he founded in 1984. He is
also a director of the Asian Infrastructure Fund Ltd., an investment vehicle for
investment  in Asian infrastructure projects, NFO Research, Inc., a panel market
research company;  Peregrine  Indonesia Fund  Limited,  an investment  fund  for
Indonesian industrial companies, Terra Nova (Bermuda) Holdings Limited, a London
market insurance and re-insurance company, Sydney Harbour Casino Holdings, Ltd.,
an  operator of casinos,  Digicon, Inc., an  independent marine seismic company;
and UroMed Corporation, a company which  develops and markets products to  treat
urological and gynecological disorders.
 
    MARTIN  M. POLLAK  has been  a director  of the  Company since  1982 and was
Chairman of the Executive Committee from 1985  to 1995. He is a founder of,  and
since  1959 has been  Executive Vice President  and Treasurer and  a director of
National Patent. He has been Chairman of the Board of Interferon Sciences,  Inc.
since  1981; Chairman of the Board of General Physics Corporation since 1988 and
a director since 1987; and Chairman of  the Board of SGLG, Inc. since 1991;  and
President and Chief Executive Officer and a director of American Drug Company, a
generic  drug  distribution company,  since January  1994.  Mr. Pollak  has been
Chairman of the Czech and Slovak United States Economic Council and a member  of
the Board of Trustees of the Worcester Foundation for Experimental Biology and a
director  of Brandon Systems Corporation,  a personnel recruiting company, since
1986.
 
    EARLE C. WILLIAMS has been a director of the Company since January 1995.  He
has  served on the Board of Directors  of BDM International, Inc. since 1972 and
was the President and Chief Executive Officer of that company from 1972 to 1992.
Mr. Williams also serves on the  Board of Directors of the following  companies:
Gamma-A  Technologies, Inc.,  a start-up bio-technology  company, Nortel Federal
Systems, Inc., a provider of communication equipment and services to the federal
government, and The Parsons Corporation, an international engineering firm.
 
                                       37
<PAGE>
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
    The following table sets forth, as of February 22, 1996, and as adjusted  to
reflect  the  sale of  the  shares of  Common  Stock in  this  offering, certain
information with respect to beneficial ownership of the Common Stock by (i) each
person or entity known by  the Company to own beneficially  more than 5% of  the
Common Stock outstanding, (ii) each director of the Company, (iii) all executive
officers  and  directors  of  the  Company  as  a  group  and  (iv)  the Selling
Stockholders. Except as indicated by footnote, the persons or entities named  in
the table below have sole voting and investment power with respect to all shares
of Common Stock shown as beneficially owned by them.
 
<TABLE>
<CAPTION>
                                                    BENEFICIAL OWNERSHIP                         BENEFICIAL OWNERSHIP
                                                      PRIOR TO OFFERING                             AFTER OFFERING
                                                  -------------------------                    -------------------------
                                                   NUMBER OF                 NUMBER OF SHARES   NUMBER OF
                      NAME                           SHARES       PERCENT     BEING OFFERED       SHARES       PERCENT
<S>                                               <C>           <C>          <C>               <C>           <C>
The Carlyle Group (1)...........................     8,240,960       52.2%             --         8,240,960       45.1%
National Patent Development Corporation (2).....     2,947,972       30.8       1,100,000(12)     1,847,972       15.3
BNFL Inc. (3)...................................     1,381,575       12.6              --         1,381,575       10.3
Soros Capital Offshore Partners LDC (4).........       509,040        5.1              --           509,040        4.1
Daniel A. D'Aniello (5).........................     8,240,960       52.2              --         8,240,960       45.1
Robert E. Prince (6)............................        74,300       *                 --            74,300       *
William E. Conway, Jr. (5)......................     8,240,960       52.2              --         8,240,960       45.1
Jerome I. Feldman (7)(8)........................     2,998,972       31.2       1,050,000(13)     1,948,972       16.1
Steven J. Gilbert (9)...........................       509,040        5.1              --           509,040        4.1
Martin M. Pollak (7)(10)........................     3,006,742       31.3       1,050,000(13)     1,956,742       16.1
Earle C. Williams...............................         1,000       *                 --             1,000       *
All executive officers and directors as a group
 (11 persons)(11)...............................    11,964,542       73.0       1,100,000(13)    10,864,542       57.5
</TABLE>
 
- ------------------------
 
 * Less than 1%.
 
(1) Represents (i) 5,023,066 shares of Common Stock issuable upon the conversion
    of  the outstanding shares of Convertible Preferred Stock beneficially owned
    by Carlyle, (ii) 2,040,616  shares of Common  Stock purchased from  National
    Patent  and (iii) 1,177,278 shares of Common  Stock which may be acquired by
    Carlyle from  the  Company upon  the  exercise of  a  presently  exercisable
    option.  In all instances,  the shares are  owned by investment partnerships
    sponsored and controlled by Carlyle. Carlyle's address is 1001  Pennsylvania
    Avenue, N.W., Suite 220 South, Washington, D.C. 20004.
 
(2)  National  Patent has  granted  to certain  of  its officers,  directors and
    employees, options which are  presently exercisable at  an average price  of
    $1.90 per share, to purchase 481,750 shares of the Common Stock owned by it.
    If  all of the  options were exercised, National  Patent would own 2,466,222
    shares of Common  Stock (25.8%). National  Patent's address is  9 West  57th
    Street, New York, New York 10019.
 
(3)   Represents  shares  of  Common  Stock  issuable  upon  conversion  of  the
    convertible debenture issued by the Company  to BNFL in connection with  the
    formation  of  a  strategic alliance.  See  "Business --  Joint  Venture and
    Collaborative Arrangements --  BNFL." BNFL's  address is  9302 Lee  Highway,
    Suite 950, Fairfax, Virginia 22031.
 
(4)  Represents (i) 310,267 shares of  Common Stock issuable upon the conversion
    of the  outstanding shares  of  Convertible Preferred  Stock held  by  Soros
    Capital  Offshore  Partners LDC  ("Soros Capital"),  (ii) 126,051  shares of
    Common Stock held by Soros Capital  and (iii) 72,722 shares of Common  Stock
    which  may be acquired  upon the exercise of  a presently exercisable option
    held by Soros Capital. All of  these securities were acquired from  Carlyle.
    Soros Capital's address is c/o Coutts & Co. (Cayman) Limited, West Bay Road,
    George Town, Grand Cayman, Cayman Islands, British West Indies.
 
                                       38
<PAGE>
(5)  Messrs. D'Aniello and Conway are each Managing Directors of Carlyle and, as
    a result, may be deemed to beneficially  own the shares of Common Stock  and
    Convertible  Preferred Stock beneficially owned by Carlyle. However, Messrs.
    D'Aniello and Conway disclaim beneficial ownership of such shares.
 
(6) Includes  options  to purchase  71,000  shares  of Common  Stock  which  are
    exercisable within 60 days, but does not include options to purchase 349,000
    shares of Common Stock which are not presently exercisable.
 
(7)  National  Patent beneficially  owns an  aggregate of  2,947,972 outstanding
    shares of Common  Stock. Based  upon the  capital stock  of National  Patent
    outstanding  at February 22,  1996, Jerome I. Feldman  and Martin M. Pollak,
    officers and  directors of  National Patent  and directors  of the  Company,
    controlled  in the aggregate  approximately 9.9% of the  voting power of all
    voting securities of  National Patent. This  percentage for Messrs.  Feldman
    and  Pollak would increase to approximately  45.0% if they exercised all the
    presently outstanding  options  to  purchase  shares  of  capital  stock  of
    National  Patent  held by  them.  Accordingly, Messrs.  Feldman  and Pollak,
    through the ownership  of National  Patent capital stock  and through  their
    positions  as directors  and executive officers  of National  Patent, may be
    deemed to  beneficially  own the  shares  of  Common Stock  of  the  Company
    beneficially  owned by National Patent.  However, Messrs. Feldman and Pollak
    disclaim beneficial ownership of such shares.
 
(8) Includes (i) 2,947,972 shares of Common Stock beneficially owned by National
    Patent, (ii)  40,000  shares  of  Common Stock  issuable  upon  exercise  of
    currently  exercisable stock  options held by  Mr. Feldman  and (iii) 11,000
    shares of Common Stock held personally by Mr. Feldman. Mr. Feldman disclaims
    beneficial ownership of the shares of Common Stock owned by National Patent.
 
(9) Mr. Gilbert is the managing general  partner of the majority owner of  Soros
    Capital  and, as a result,  may be deemed to  beneficially own the shares of
    Common Stock and Convertible Preferred Stock held by Soros Capital.
 
(10) Includes  (i)  2,947,972  shares  of Common  Stock  beneficially  owned  by
    National  Patent, (ii) 40,000 shares of  Common Stock issuable upon exercise
    of currently exercisable stock options held  by Mr. Pollak and (iii)  18,770
    shares  of Common Stock held personally  by Mr. Pollak. Mr. Pollak disclaims
    beneficial ownership of the shares of Common Stock owned by National Patent.
 
(11) Includes  6,806,133  shares that  may  be  issued upon  the  conversion  of
    convertible  securities  or  upon  the  exercise  of  options  and  warrants
    outstanding and beneficially owned by  the executive officers and  directors
    as a group.
 
(12)  Includes 100,000 shares  of Common Stock being  offered by Messrs. Feldman
    and Pollak. The shares offered by Messrs. Feldman and Pollak are subject  to
    options  to purchase shares  of Common Stock  which were granted  to them by
    National Patent.
 
(13) Includes the  1,000,000 shares of  Common Stock being  offered by  National
    Patent.  The shares  offered by  Messrs. Feldman  and Pollak  are subject to
    options to purchase  shares of Common  Stock which were  granted to them  by
    National Patent.
 
MATERIAL RELATIONSHIPS OF CERTAIN SELLING STOCKHOLDERS WITH THE COMPANY
 
    National  Patent  is, and  has been  for at  least the  last three  years, a
principal stockholder  of  the  Company. Two  of  National  Patent's  designees,
Messrs.  Feldman and Pollak,  currently serve on  the Board of  Directors of the
Company. In  connection with  the financing  transaction with  Carlyle that  was
consummated  on January 24, 1995, the Company granted to National Patent certain
registration rights including the right to include shares of Common Stock  owned
by  it in registration statements  filed by the Company  with the Securities and
Exchange Commission (the "Commission") and the right, on one occasion, to  cause
the  Company to register the shares of Common Stock owned by it. The Company may
reduce the number of shares to be sold by National Patent and any other  selling
stockholders  on a pro rata  basis if the number of  shares to be registered and
sold would materially and adversely affect the offering price.
 
                                       39
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
GENERAL
 
    Upon the  closing of  this offering,  the authorized  capital stock  of  the
Company  will consist of 35,000,000  shares of Common Stock,  par value $.01 per
share, and 5,000,000 shares of preferred stock, par value $.01 per share.
 
COMMON STOCK
 
    The holders  of Common  Stock are  entitled to  one vote  per share  on  all
matters  voted on by stockholders, including the election of directors. There is
no cumulative voting for the election of directors. Subject to the  preferential
rights of the Convertible Preferred Stock and any series of preferred stock that
may be authorized and issued hereafter, the holders of Common Stock are entitled
to such dividends as may be declared from time to time by the Board of Directors
from  funds available therefor.  Upon liquidation, dissolution  or winding-up of
the Company, the holders of the Common  Stock will be entitled to share  ratably
all  assets  of the  Company available  for distribution  to such  holders after
payment of liabilities, subject to prior  distribution rights of holders of  any
shares  of Convertible Preferred Stock and  any other preferred stock issued and
outstanding hereafter. No holder  of Common Stock has  any preemptive rights  to
subscribe  for  any  securities  of  the  Company  of  any  kind  or  class. All
outstanding shares of  Common Stock are  fully paid and  non-assessable and  all
shares  of Common Stock to be  outstanding upon exercise of outstanding warrants
or options will be  fully paid and non-assessable.  The rights, preferences  and
privileges of holders of Common Stock are subject to the rights, preferences and
privileges  of the Convertible  Preferred Stock, including  the voting rights of
the Convertible Preferred Stock, and will be subject to the rights,  preferences
and  privileges of any series of preferred stock which the Company may authorize
and  issue  in  the   future.  See  "Risk  Factors   --  Control  by   Principal
Stockholders."
 
PREFERRED STOCK
 
    Upon  the closing of this offering, the  Company will be authorized to issue
5,000,000 shares of preferred stock. As of February 22, 1996, 160,000 shares  of
Convertible  Preferred Stock are issued and  outstanding. The Board of Directors
has the authority, without  any further vote or  action by the stockholders,  to
issue  preferred stock in  one or more series  and to fix  the number of shares,
designations,  relative  rights  (including  voting  rights),  preferences   and
limitations  of such  series to  the full extent  now or  hereafter permitted by
Delaware law. The Company has no present intention of issuing additional  shares
of preferred stock.
 
CONVERTIBLE PREFERRED STOCK
 
    The  following is a brief summary of the rights, preferences and limitations
of the outstanding shares of Convertible Preferred Stock.
 
    DIVIDENDS.  The Convertible Preferred Stock is entitled to cumulative annual
dividends of 8% per share ($8.00) payable quarterly in arrears, when, as and  if
declared  by  the  Board of  Directors  of  the Company  out  of  assets legally
available for the payment of dividends.
 
    PREFERENCES.  The Convertible Preferred Stock has a preference with  respect
to  assets and dividends over the Common Stock. In the event of the liquidation,
dissolution or  winding-up  of  the  Company, the  holders  of  the  Convertible
Preferred  Stock are entitled to receive a cash payment equal to the Liquidation
Value of each share, as defined below, before any distribution of assets to  any
holder  of Common  Stock or any  other class or  series of stock  of the Company
ranking junior to the Convertible Preferred  Stock as to rights on  liquidation,
dissolution or winding up. The Convertible Preferred Stock will be senior to any
existing  or future class of capital  stock or securities into which convertible
indebtedness is convertible. The "Liquidation  Value" per share means an  amount
equal  to $100 plus the  sum of all declared but  unpaid dividends. No holder of
the Convertible Preferred Stock has any  preemptive rights to subscribe for  any
securities of the Company of any kind or class.
 
    CONVERSION.  Each share of the Convertible Preferred Stock is, at the option
of the holder, convertible into 33 1/3 shares of Common Stock.
 
                                       40
<PAGE>
    REDEMPTION.  The Company is required to redeem all of the outstanding shares
of  Convertible  Preferred Stock  on January  24,  2002 at  $100 per  share plus
accrued and unpaid dividends.
 
    VOTING RIGHTS.  The holders of the Convertible Preferred Stock are  entitled
to  vote that  number of  votes equal to  the number  of shares  of Common Stock
issuable upon conversion of the Convertible  Preferred Stock and have the  right
to vote, together with the Common Stock voting as a single class, on all matters
on which the Common Stock can vote. Additionally, the holders of the Convertible
Preferred  Stock have the right, voting as a separate class, to elect a majority
of the Company's Board  of Directors as  long as Carlyle  or its affiliates  own
shares  of capital stock of the Company having 20% or more of the votes that may
be cast at annual or special meetings of stockholders.
 
    REGISTRATION RIGHTS.  If the Company files a registration statement with the
Commission (excluding the Company's current shelf registration statement on file
with the Commission and any registration statements filed in connection with any
of the Company's employee benefit plans or in connection with any acquisition on
Form S-4),  the  holders  of  the Convertible  Preferred  Stock  have  unlimited
piggyback  registration rights  to cause  the Company  to include  the shares of
Common Stock  issued  upon conversion  of  the Convertible  Preferred  Stock  or
purchased  by Carlyle  from National Patent  in such  registration statement for
sale in the same manner and under the same conditions as originally contemplated
in such registration statement. The Company may  reduce on a pro rata basis  the
number  of shares sold by each selling stockholder if the number of shares to be
registered and sold would  materially and adversely  affect the offering  price.
Additionally, the holders of shares of Convertible Preferred Stock have a demand
right  on three separate occasions to cause the Company to register their shares
of Common Stock issued upon the conversion of the Convertible Preferred Stock at
the Company's expense. The  holders of the Convertible  Preferred Stock have  an
additional  demand registration right  at their own  expense. Carlyle has agreed
not to sell any  of the shares of  capital stock of the  Company owned by it  in
this offering.
 
BUSINESS COMBINATIONS
 
    Section  203 of  the Delaware General  Corporation Law  contains a provision
restricting Delaware corporations, other than corporations that "opt out" of the
statute, from engaging in a wide range of transactions which may be entered into
by any such  corporation and  any interested  stockholder. The  Company has  not
opted  out of Section 203. Under  Section 203, the term "interested stockholder"
is defined to include any person or entity  who has acquired 15% or more of  any
class or series of stock entitled to vote generally in the election of directors
but  does not acquire 85%  of such shares in the  transaction in which more than
15% of the shares were acquired. Any such stockholder may not engage in  certain
"Business  Combinations"  with  the  corporation for  a  period  of  three years
subsequent  to  the  date  on  which  the  stockholder  became  an   "interested
stockholder"  unless (i) the Board of Directors prior to the date the interested
stockholder obtained such status approved  either the "Business Combination"  or
the  transaction in which the stockholder became an "interested stockholder," or
(ii) the  holders  of at  least  two-thirds  of the  outstanding  voting  stock,
excluding  those  shares  owned  by the  "interested  stockholder,"  approve the
"Business Combination."  Section  203 does  not  apply to  Carlyle  or  National
Patent.
 
    Section  203 defines "Business  Combination" to encompass  a wide variety of
transactions with  or  caused  by  an  "interested  stockholder"  in  which  the
"interested stockholder" receives or could receive a benefit on other than a pro
rata  basis  with other  stockholders, including  mergers, certain  asset sales,
certain issuances  of  additional  shares to  the  "interested  stockholder"  in
transactions  with the corporation which  increase the proportionate interest of
the  "interested  stockholder"   or  transactions  in   which  the   "interested
stockholder"   receives  certain  other  benefits.   This  statute  could  deter
unfriendly offers or other efforts to obtain control of the Company that are not
approved by the Board of Directors and thereby possibly deprive the stockholders
of opportunities to  sell their  shares of Common  Stock at  prices higher  than
prevailing market prices.
 
TRANSFER AGENT AND REGISTRAR
 
    The  transfer  agent and  registrar  for the  Common  Stock is  Harris Trust
Company of New York.
 
                                       41
<PAGE>
                                  UNDERWRITING
 
    Subject to certain  conditions contained  in the  Underwriting Agreement  (a
copy of which is filed as an exhibit to the Registration Statement of which this
Prospectus   is  a  part),   a  syndicate  of   underwriters  named  below  (the
"Underwriters"), for whom Donaldson,  Lufkin & Jenrette Securities  Corporation,
Deutsche Morgan Grenfell/C. J. Lawrence Inc. and Gruntal & Co., Incorporated are
acting  as  representatives (the  "Representatives"),  have severally  agreed to
purchase from the Company and the Selling Stockholders an aggregate of 3,600,000
shares of  Common  Stock.  The  number  of shares  of  Common  Stock  that  each
Underwriter has agreed to purchase is set forth opposite its name below:
 
<TABLE>
<CAPTION>
                                                                                   NUMBER OF
                                  UNDERWRITERS                                       SHARES
<S>                                                                                <C>
Donaldson, Lufkin & Jenrette Securities Corporation..............................   1,272,150
Deutsche Morgan Grenfell/C. J. Lawrence Inc......................................   1,272,150
Gruntal & Co., Incorporated......................................................     282,700
Alex. Brown & Sons Incorporated..................................................      45,000
A.G. Edwards & Sons, Inc. .......................................................      45,000
Goldman, Sachs & Co. ............................................................      45,000
Merrill Lynch, Pierce, Fenner & Smith Incorporated...............................      45,000
Morgan Stanley & Co. Incorporated................................................      45,000
Oppenheimer & Co., Inc. .........................................................      45,000
Prudential Securities Incorporated...............................................      45,000
Smith Barney Inc. ...............................................................      45,000
Pacific Growth Equities, Inc. ...................................................      45,000
Advest, Inc. ....................................................................      23,000
Branch, Cabell and Co. ..........................................................      23,000
Ferris, Baker Watts, Inc. .......................................................      23,000
First Albany Corporation.........................................................      23,000
First Analysis Securities Corporation............................................      23,000
First of Michigan Corporation....................................................      23,000
Janney Montgomery Scott Inc. ....................................................      23,000
Johnston, Lemon & Co. Incorporated...............................................      23,000
Legg Mason Wood Walker, Incorporated.............................................      23,000
McDonald & Company Securities, Inc. .............................................      23,000
Needham & Company, Inc. .........................................................      23,000
The Ohio Company.................................................................      23,000
Parker/Hunter Incorporated.......................................................      23,000
Pennsylvania Merchant Group Ltd. ................................................      23,000
Roney & Co. .....................................................................      23,000
Van Kasper & Company.............................................................      23,000
                                                                                   ----------
    Total........................................................................   3,600,000
                                                                                   ----------
                                                                                   ----------
</TABLE>
 
    The  Underwriting  Agreement provides  that the  obligations of  the several
Underwriters to purchase the shares of  Common Stock offered hereby are  subject
to  approval of  certain legal  matters by  their counsel  and to  certain other
conditions. If  any  of  the  shares  of  Common  Stock  are  purchased  by  the
Underwriters  pursuant  to  the  Underwriting  Agreement,  the  Underwriters are
obligated to  purchase  all  such  shares  (other  than  those  covered  by  the
over-allotment option described below).
 
    The   Company  and  the  Selling  Stockholders  have  been  advised  by  the
Underwriters that they propose to offer the shares of Common Stock to the public
at the public offering price set forth on the cover page of this Prospectus  and
to  certain  dealers  (who  may  include Underwriters)  at  such  price,  less a
concession not in  excess of $0.55  per share. The  Underwriters may allow,  and
such  dealers may  re-allow, a concession  not in  excess of $0.10  per share to
certain other  dealers.  After  the  offering, the  price  to  the  public,  the
concession and the discount to dealers may be changed by the Representatives.
 
                                       42
<PAGE>
    The  Company has granted  to the Underwriters an  option, exercisable for 30
days from the  date of  this Prospectus, to  purchase up  to 540,000  additional
shares  of Common Stock at  the price to the  public less underwriting discounts
and commissions,  solely  to  cover  over-allotments. To  the  extent  that  the
Underwriters  exercise such option, each of  the Underwriters will be committed,
subject  to  certain  conditions,  to   purchase  a  number  of  option   shares
proportionate  to  such Underwriter's  initial  commitment as  indicated  in the
preceding table.
 
    In the Underwriting Agreement, the Company, the Selling Stockholders and the
Underwriters have agreed  to indemnify each  other against certain  liabilities,
including  liabilities  under  the  Securities  Act  of  1933,  as  amended (the
"Securities Act").
 
    The Company, the executive officers and directors of the Company and certain
stockholders of the  Company have each  agreed that they  will not, without  the
prior  written consent of  Donaldson, Lufkin &  Jenrette Securities Corporation,
register the sale of, sell,  contract to sell, grant  any option to purchase  or
otherwise  dispose of any  shares of Common Stock  or any securities convertible
into or exercisable or exchangeable for Common  Stock, for a period of 120  days
after  the date of this Prospectus, except that the Company may issue, and grant
options to purchase, shares of Common  Stock under its existing stock plans  and
National  Patent may sell up to 123,750 shares of Common Stock under an existing
stock option plan.
 
    The rules of the  Commission generally prohibit  the Underwriters and  other
members  of the selling group, if any, from  making a market in the Common Stock
during the "cooling-off" period immediately preceding the commencement of  sales
in  the offering. The  Commission has, however, adopted  an exemption from these
rules that permits passive market  making under certain conditions. These  rules
permit  the  Underwriters or  other members  of  the selling  group, if  any, to
continue to make a market in the  Common Stock subject to the conditions,  among
others,  that  their  bid not  exceed  the highest  bid  by a  market  maker not
connected with the offering and that their net purchases on any one trading  day
not exceed prescribed limits. Pursuant to these exemptions, certain Underwriters
and  other members of  the selling group,  if any, may  engage in passive market
making in the Common Stock during the cooling-off period.
 
                                 LEGAL MATTERS
 
    The validity of  the shares of  Common Stock offered  hereby will be  passed
upon  for the  Company by Piper  & Marbury L.L.P.,  Baltimore, Maryland. Certain
legal matters  in connection  with this  offering will  be passed  upon for  the
Underwriters by McDermott, Will & Emery, Chicago, Illinois.
 
                                    EXPERTS
 
    The  consolidated financial statements of GTS Duratek, Inc. and subsidiaries
as of December 31,  1994 and 1995 and  for each of the  years in the  three-year
period ended December 31, 1995 have been included herein and in the registration
statement  in reliance  upon the  report of  KPMG Peat  Marwick LLP, independent
certified public accountants, appearing elsewhere herein, and upon the authority
of said firm as experts in accounting and auditing.
 
    The statements of operations,  stockholders' equity and  cash flows of  Bird
Environmental  Gulf Coast,  Inc. for  the year ended  December 31,  1994 and the
eleven months  ended November  30, 1995  have been  included herein  and in  the
registration  statement in  reliance upon the  report of KPMG  Peat Marwick LLP,
independent certified public accountants,  appearing elsewhere herein, and  upon
the authority of said firm as experts in accounting and auditing.
 
                             AVAILABLE INFORMATION
 
    The  Company is subject to the  informational requirements of the Securities
Exchange Act  of  1934, as  amended  (the  "Exchange Act"),  and  in  accordance
therewith  files  reports,  proxy  statements  and  other  information  with the
Commission.  Such  reports,  proxy  statements  and  other  information  can  be
inspected  and copied  at the public  reference facilities of  the Commission at
Room 1024, 450 Fifth Street, N.W.,
 
                                       43
<PAGE>
Washington, D.C. 20549-1004, and at the Commission's Regional Offices located at
Northwestern Atrium  Center,  500  West Madison  Street,  Suite  1400,  Chicago,
Illinois 60661-2511 and Suite 1300, Seven World Trade Center, New York, New York
10048.  Copies of such materials can also  be obtained from the Public Reference
Section of the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,  at
prescribed  rates. The  Common Stock  is listed  on the  Nasdaq National Market.
Reports, proxy statements and  other information concerning  the Company may  be
inspected  at the  Nasdaq Department of  the National  Association of Securities
Dealers, Inc., 1735 K Street, N.W., Washington, D.C. 20006.
 
    The Company has filed with the Commission a Registration Statement under the
Securities Act  with respect  to  the Common  Stock.  This Prospectus  does  not
contain  all the  information set forth  in the  Registration Statement, certain
portions of which have been omitted as permitted by the rules and regulations of
the Commission. For  further information  with respect  to the  Company and  the
Common  Stock, reference  is made to  the Registration  Statement, including the
exhibits thereto. Statements contained herein  concerning any document filed  as
an  exhibit to the  Registration Statement are not  necessarily complete, and in
each instance reference is made to the copy of such document filed as an exhibit
to the Registration Statement.  The Registration Statement  may be inspected  by
anyone  without charge at the principal  office of the Commission in Washington,
D.C., and copies of all  or any part of it  may be obtained from the  Commission
upon payment of the prescribed fees.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents filed by the Company with the Commission pursuant to
the  Exchange Act  (File No. 0-14292)  are incorporated into  this Prospectus by
reference:
 
    (a) Annual Report on Form 10-K for the year ended December 31, 1995; and
 
    (b) Amendment No. 1 filed on February 12, 1996 to the Current Report on Form
       8-K, dated November 29, 1995, filed on December 11, 1995.
 
    Any  statement  contained  in  a  document  incorporated  or  deemed  to  be
incorporated  by reference herein  shall be deemed to  be modified or superseded
for purposes of this Prospectus to the extent that a statement contained  herein
or  in any other  subsequently filed document which  also is or  is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall  not be deemed, except as so  modified
or superseded, to constitute a part of this Prospectus.
 
    The  Company  will  provide without  charge  to each  person,  including any
beneficial owner, to  whom this Prospectus  is delivered, upon  written or  oral
request  of  such  person, a  copy  of any  or  all of  the  foregoing documents
incorporated herein by reference (other than exhibits to such documents,  unless
such  exhibits are specifically incorporated  by reference into such documents).
Written or telephone  requests should  be directed  to GTS  Duratek, Inc.,  8955
Guilford  Road,  Suite  200,  Columbia,  Maryland  21046,  Attention:  Robert F.
Shawver, Executive Vice President and Chief Financial Officer, (410) 312-5100.
 
                                       44
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
GTS DURATEK, INC. AND SUBSIDIARIES
 
Independent Auditors' Report...............................................................................  F-2
 
Consolidated Balance Sheets at December 31, 1994 and 1995..................................................  F-3
 
Consolidated Statements of Operations for the years ended December 31, 1993, 1994 and 1995.................  F-4
 
Consolidated Statements of Stockholders' Equity for the years ended December 31, 1993, 1994 and 1995.......  F-5
 
Consolidated Statements of Cash Flows for the years ended December 31, 1993, 1994 and 1995.................  F-6
 
Notes to Consolidated Financial Statements.................................................................  F-7
 
BIRD ENVIRONMENTAL GULF COAST, INC.
 
Independent Auditors' Report...............................................................................  F-16
 
Statements of Operations for the year ended December 31, 1994 and the eleven months ended November 30,
 1995......................................................................................................  F-17
 
Statements of Stockholders' Equity for the year ended December 31, 1994 and the eleven months ended
 November 30, 1995.........................................................................................  F-17
 
Statements of Cash Flows for the year ended December 31, 1994 and the eleven months ended November 30,
 1995......................................................................................................  F-18
 
Notes to Financial Statements..............................................................................  F-19
 
PRO FORMA FINANCIAL INFORMATION (UNAUDITED)
 
Discussion of Pro Forma Information (Unaudited)............................................................  F-21
 
Pro Forma Consolidated Statement of Operations for the year ended December 31, 1995 (Unaudited)............  F-22
</TABLE>
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors and Stockholders
GTS Duratek, Inc.:
 
    We have audited the accompanying consolidated balance sheets of GTS Duratek,
Inc.  and  subsidiaries  as of  December  31,  1994 and  1995,  and  the related
consolidated statements of operations, stockholders'  equity and cash flows  for
each  of  the years  in the  three-year  period ended  December 31,  1995. These
consolidated financial  statements  are  the  responsibility  of  the  Company's
management.  Our responsibility is  to express an  opinion on these consolidated
financial statements based on our audits.
 
    We have conducted our audits in accordance with generally accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the  amounts and disclosures in the financial statements. An audit also includes
assessing the  accounting  principles used  and  significant estimates  made  by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our  opinion, the  consolidated financial  statements referred  to  above
present fairly, in all material respects, the financial position of GTS Duratek,
Inc.  and subsidiaries as of December 31, 1994 and 1995 and the results of their
operations and their cash flows for each  of the years in the three-year  period
ended  December  31,  1995,  in conformity  with  generally  accepted accounting
principles.
 
                                                   KPMG Peat Marwick LLP
 
Baltimore, Maryland
March 1, 1996, except as to
note 18, which is as of
April 16, 1996
 
                                      F-2
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
                          CONSOLIDATED BALANCE SHEETS
                           DECEMBER 31, 1994 AND 1995
 
<TABLE>
<CAPTION>
                              ASSETS                                    1994        1995
                                                                     ----------  ----------
<S>                                                                  <C>         <C>
Current assets:
  Cash and cash equivalents........................................  $       --  $11,396,008
  Receivables, less allowance for doubtful accounts of $97,732 and
   $68,964.........................................................   8,090,614   9,321,513
  Costs and estimated earnings in excess of billings on uncompleted
   contracts.......................................................   3,119,443   7,707,434
  Inventories......................................................     334,998     274,859
  Prepaid expenses and other current assets........................     141,510      79,686
                                                                     ----------  ----------
    Total current assets...........................................  11,686,565  28,779,500
Costs and estimated earnings in excess of billings on uncompleted
 contracts, noncurrent.............................................   1,307,728          --
Property, plant and equipment, net.................................   2,137,247   3,541,462
Investments in and advances to joint ventures, net.................   2,417,771   4,059,078
Intangibles, net of accumulated amortization of $874,589 and
 $999,454..........................................................     637,553     553,517
Deferred charges and other assets..................................   1,013,220   1,726,270
                                                                     ----------  ----------
                                                                     $19,200,084 $38,659,827
                                                                     ----------  ----------
                                                                     ----------  ----------
 
               LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Short-term borrowings............................................  $7,630,512  $       --
  Current maturities of long-term debt.............................     707,094     470,709
  Accounts payable and accrued expenses............................   3,427,236   4,194,713
                                                                     ----------  ----------
    Total current liabilities......................................  11,764,842   4,665,422
Long-term debt.....................................................     502,417      36,000
Convertible debenture..............................................          --  10,086,931
                                                                     ----------  ----------
    Total liabilities..............................................  12,267,259  14,788,353
                                                                     ----------  ----------
Minority interest of subsidiary....................................          --       5,610
                                                                     ----------  ----------
8% Cumulative Convertible Redeemable Preferred Stock - $.01 par
 value; 160,000 shares authorized, issued and outstanding
 (liquidation value $16,320,000)...................................          --  14,608,890
                                                                     ----------  ----------
Stockholders' equity:
  Preferred stock - $.01 par value; authorized 4,840,000 shares;
   none issued.....................................................          --          --
  Common stock - $.01 par value; authorized 20,000,000 shares;
   issued 8,759,775 shares in 1994 and 9,475,878 shares in 1995....      87,598      94,758
  Capital in excess of par value...................................  16,656,009  18,912,751
  Deficit..........................................................  (9,639,005) (9,578,758)
  Treasury stock, 70,458 shares, at cost...........................    (171,777)   (171,777)
                                                                     ----------  ----------
    Total stockholders' equity.....................................   6,932,825   9,256,974
Commitments and contingencies......................................
                                                                     ----------  ----------
                                                                     $19,200,084 $38,659,827
                                                                     ----------  ----------
                                                                     ----------  ----------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-3
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
<TABLE>
<CAPTION>
                                                                      1993         1994         1995
                                                                   -----------  -----------  -----------
<S>                                                                <C>          <C>          <C>
Revenues.........................................................  $33,504,540  $35,967,563  $40,418,066
Cost of revenues.................................................   28,608,831   28,856,910   32,220,569
                                                                   -----------  -----------  -----------
Gross profit.....................................................    4,895,709    7,110,653    8,197,497
Selling, general and administrative expenses.....................    5,737,350    5,925,618    5,875,688
                                                                   -----------  -----------  -----------
Income (loss) from operations....................................     (841,641)   1,185,035    2,321,809
Interest income (expense), net...................................     (372,129)    (595,475)      57,453
                                                                   -----------  -----------  -----------
Income (loss) before income taxes and proportionate share of loss
 of joint venture................................................   (1,213,770)     589,560    2,379,262
Income taxes.....................................................      (73,331)     (11,487)    (100,926)
                                                                   -----------  -----------  -----------
Income (loss) before proportionate share of loss of joint
 venture.........................................................   (1,287,101)     578,073    2,278,336
Proportionate share of loss of joint venture.....................           --     (321,548)    (824,025)
                                                                   -----------  -----------  -----------
Net income (loss)................................................   (1,287,101)     256,525    1,454,311
Preferred stock dividends and charges for accretion..............           --           --   (1,394,064)
                                                                   -----------  -----------  -----------
Net income (loss) attributable to common stockholders............  $(1,287,101) $   256,525  $    60,247
                                                                   -----------  -----------  -----------
                                                                   -----------  -----------  -----------
Net income (loss) per share......................................  $     (0.16) $      0.03  $      0.01
Weighted average common shares outstanding.......................    7,936,384    8,655,811    8,820,131
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-4
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
<TABLE>
<CAPTION>
                                         COMMON STOCK     CAPITAL IN                              TOTAL
                                      ------------------   EXCESS OF                TREASURY   STOCKHOLDERS'
                                       SHARES    AMOUNT    PAR VALUE     DEFICIT      STOCK       EQUITY
                                      ---------  -------  -----------  -----------  ---------  ------------
<S>                                   <C>        <C>      <C>          <C>          <C>        <C>
Balance, December 31, 1992..........  8,009,875  $80,099  $13,373,383  $(8,608,429) $(315,910)  $ 4,529,143
  Net loss..........................         --       --           --   (1,287,101)        --    (1,287,101)
  Exercise of options...............     40,400      404       63,196           --         --        63,600
  Issuance of common stock for
   compensation expense and
   litigation settlement............     15,000      150       49,850           --         --        50,000
  Issuance of treasury stock for
   litigation settlement............         --       --           --           --    144,133       144,133
  Issuance of common stock warrants
   in exchange for certain
   technology rights................         --       --      500,000           --         --       500,000
  Issuance of common stock in
   exchange for cash and certain
   technology rights................    562,500    5,625    2,154,001           --         --     2,159,626
                                      ---------  -------  -----------  -----------  ---------  ------------
Balance, December 31, 1993..........  8,627,775   86,278   16,140,430   (9,895,530)  (171,777)    6,159,401
  Net income........................         --       --           --      256,525         --       256,525
  Exercise of options...............      7,000       70       16,829           --         --        16,899
  Issuance of common stock in
   exchange for cash................    125,000    1,250      498,750           --         --       500,000
                                      ---------  -------  -----------  -----------  ---------  ------------
Balance, December 31, 1994..........  8,759,775   87,598   16,656,009   (9,639,005)  (171,777)    6,932,825
  Net income........................         --       --           --    1,454,311         --     1,454,311
  Exercise of options and
   warrants.........................    716,103    7,160    1,946,742           --         --     1,953,902
  Income tax benefit from exercise
   of non-qualified stock options...         --       --       30,000           --         --        30,000
  Issuance of a common stock option
   for cash.........................         --       --      280,000           --         --       280,000
  Preferred stock dividends and
   charges for accretion............         --       --           --   (1,394,064)        --    (1,394,064)
                                      ---------  -------  -----------  -----------  ---------  ------------
Balance, December 31, 1995..........  9,475,878  $94,758  $18,912,751  $(9,578,758) $(171,777)  $ 9,256,974
                                      ---------  -------  -----------  -----------  ---------  ------------
                                      ---------  -------  -----------  -----------  ---------  ------------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-5
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                  YEARS ENDED DECEMER 31, 1993, 1994 AND 1995
 
<TABLE>
<CAPTION>
                                                                      1993         1994         1995
                                                                   -----------  -----------  -----------
<S>                                                                <C>          <C>          <C>
Cash flows from operating activities:
  Net income (loss)..............................................  $(1,287,101) $   256,525  $ 1,454,311
  Adjustments to reconcile to net income (loss) to net cash
   provided by (used in) operating activities:
    Depreciation and amortization................................      533,215      508,900      608,165
    Proportionate share of loss of joint venture.................           --      321,548      824,025
    Income tax benefit from exercise of non-qualified stock
     options.....................................................           --           --       30,000
    Changes in operating items:
      Receivables................................................    1,796,847   (2,697,259)    (759,195)
      Costs and estimated earnings in excess of billings on
       uncompleted contracts.....................................     (576,274)  (2,843,655)  (3,280,263)
      Inventories................................................      114,616       (8,180)      61,180
      Prepaid expenses and other current assets..................       37,286       (6,227)      63,624
      Accounts payable and accrued expenses......................      861,304      441,747      145,995
      Other......................................................      194,133           --        5,202
                                                                   -----------  -----------  -----------
Net cash provided by (used in) operating activities..............    1,674,026   (4,026,601)    (846,956)
                                                                   -----------  -----------  -----------
Cash flows from investing activities:
  Additions to property, plant and equipment.....................     (993,902)    (269,383)  (1,586,062)
  Acquisition of DuraTherm, Inc..................................           --           --     (260,619)
  Additions to intangibles.......................................      (26,816)      (5,179)     (40,828)
  Advances to joint ventures.....................................           --   (1,489,319)  (2,465,332)
  Other..........................................................     (190,871)      42,853     (669,889)
                                                                   -----------  -----------  -----------
Net cash used in investing activities............................   (1,211,589)  (1,721,028)  (5,022,730)
                                                                   -----------  -----------  -----------
Cash flows from financing activities:
  Net proceeds from (repayments of) short-term borrowings........   (3,129,276)   4,520,946   (7,630,512)
  Proceeds from issuance of long-term debt.......................      264,573    1,110,000           --
  Reduction of long-term debt....................................           --     (400,216)    (702,802)
  Proceeds from issuance of convertible debenture, net of debt
   issue costs...................................................           --           --    9,830,280
  Proceeds from issuance of preferred stock and common stock
   options, net of offering expenses.............................           --           --   14,690,026
  Preferred stock dividends paid.................................           --           --     (875,200)
  Proceeds from issuance of common stock.........................    1,473,226      516,899    1,953,902
  Other..........................................................      929,040           --           --
                                                                   -----------  -----------  -----------
Net cash provided by (used in) financing activities..............     (462,437)   5,747,629   17,265,694
                                                                   -----------  -----------  -----------
Net increase in cash and cash equivalents........................           --           --   11,396,008
Cash and cash equivalents, beginning of year.....................           --           --           --
                                                                   -----------  -----------  -----------
Cash and cash equivalents, end of year...........................  $        --  $        --  $11,396,008
                                                                   -----------  -----------  -----------
                                                                   -----------  -----------  -----------
Cash paid during the period for:
  Interest.......................................................  $   432,018  $   544,933  $   189,347
  Income taxes...................................................       41,314       11,487       60,091
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-6
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                           DECEMBER 31, 1994 AND 1995
 
1.  DESCRIPTION OF BUSINESS
    GTS  Duratek, Inc.  (the "Company")  provides waste  treatment solutions for
radioactive, hazardous,  mixed and  other wastes.  The Company's  vitrification,
thermal  desorption and ion exchange technologies  convert waste to stable forms
for storage  or  disposal  while  achieving  significant  volume  reduction.  To
implement its waste treatment technologies and provide related technical support
services,  the Company has a staff  of highly skilled personnel with significant
environmental services experience. The services provided by the Company  include
staff  augmentation  and outage  support,  principally to  assist  nuclear power
plants  during  regular  maintenance   shutdowns,  environmental  and   computer
consulting and environmental safety training.
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES
 
  PRINCIPLES OF CONSOLIDATION
 
    The  consolidated financial statements  include the accounts  of the Company
and its subsidiaries, all of which  are wholly-owned except for DuraTherm,  Inc.
which  is 80% owned. All significant intercompany balances and transactions have
been eliminated in consolidation. Investments in subsidiaries and joint ventures
in which the Company does not  have control or majority ownership are  accounted
for under the equity method.
 
  CASH AND CASH EQUIVALENTS
 
    For  purposes  of  the consolidated  statement  of cash  flows,  the Company
considers all highly liquid investments with initial maturities, at the date  of
purchase,  of three months or  less to be cash  equivalents. Cash equivalents at
December 31, 1995 were $11,121,008.
 
  INVENTORIES
 
    Inventories are valued at the lower of cost or market, principally using the
first in, first out (FIFO) method of costing.
 
  PROPERTY, PLANT, AND EQUIPMENT
 
    Property, plant and equipment are carried at cost. Replacements, maintenance
and repairs  which  do not  extend  the lives  of  the assets  are  expensed  as
incurred.  The  Company  provides  for  depreciation  of  property,  plant,  and
equipment when  such assets  become operational,  primarily on  a  straight-line
basis  over  useful lives  of  three to  ten  years. Leasehold  improvements are
amortized over the shorter of the asset life or the term of the lease.
 
  INTANGIBLES
 
    Intangible assets  consist  principally  of amounts  assigned  to  covenants
not-to-compete  and costs incurred to obtain  and maintain patents. Covenant and
patent amounts are being amortized  over ten and seventeen years,  respectively,
on  a straight-line basis. The Company assesses the recoverability of intangible
assets by determining whether  the amortization over the  remaining life of  the
asset  can be  recovered through undiscounted  future cash flows.  The amount of
impairment, if any,  is measured  based on projected  discounted operating  cash
flows.
 
  DEFERRED CHARGES
 
    Deferred  charges consist principally of costs related to the maintenance of
the  Company's   temporary   personnel   work   force   data   base,   including
certifications,  security  clearances and  related  information. Such  costs are
amortized over the term of the expected benefit which is generally two years.
 
                                      F-7
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
  REVENUE RECOGNITION
 
    The Company generates substantially all of its revenue under fixed-price and
time-and-materials contracts.  Revenue  from  contracts  is  recognized  on  the
percentage-of-completion  method as  costs are  incurred and  includes estimated
fees at predetermined  rates as  measured by the  cost-to-cost method.  Contract
costs include all direct labor, material costs and the indirect costs related to
contract performance. Differences between recorded costs, estimated earnings and
final  billings are recognized in the  period in which they become determinable.
Costs and estimated earnings in excess of billings on uncompleted contracts  are
recorded  as  assets. Billings  in  excess of  costs  and estimated  earnings on
uncompleted contracts are recorded  as liabilities. Retainages, amounts  subject
to future negotiation and amounts related to claims are not material.
 
    In  addition,  the Company  generates revenue  from  product sales  which is
recognized upon product shipment.
 
  INCOME TAXES
 
    Deferred tax assets and liabilities are recognized for the estimated  future
tax  consequences of temporary  differences between the  financial reporting and
tax bases of assets and  liabilities based on enacted  tax rates in effect  when
such  amounts are  expected to be  realized based on  consideration of available
evidence, including tax planning  strategies and other  factors. The effects  of
changes  in  tax  laws or  rates  on  deferred tax  assets  and  liabilities are
recognized in the period that includes the enactment date.
 
  FAIR VALUE OF FINANCIAL INSTRUMENTS
 
    The estimated  fair  value  of  financial  instruments,  including  accounts
receivable, accounts payable and long-term debt, approximate carrying value.
 
  USE OF ESTIMATES
 
    Management  of the  Company has made  a number of  estimates and assumptions
relating to  the  reporting  of  assets and  liabilities  and  their  respective
disclosures  to prepare  these consolidated  financial statements  in conformity
with generally  accepted  accounting  principles. Actual  results  could  differ
significantly from those estimates.
 
  NET INCOME (LOSS) PER SHARE
 
    The  net income  (loss) per share  for 1993,  1994 and 1995  was computed by
dividing the  net  income  (loss) attributable  to  common  stockholders,  which
reflects the preferred stock dividend requirement and accretion, by the weighted
average   number  of  shares  of  common  stock  outstanding  and  common  stock
equivalents to the extent  they result in additional  dilution. The Company  has
issued  options and  warrants which exceed  20% of the  common stock outstanding
and, accordingly,  the Company  determines the  dilutive effect  of such  common
stock  equivalents using the modified treasury stock method. For the years ended
December 31, 1993, 1994 and 1995, the common stock equivalents were deemed to be
anti-dilutive and, accordingly, are not included in the weighted average  number
of shares used in determining net income (loss) per share.
 
  RECLASSIFICATIONS
 
    Certain  amounts for 1993 and 1994 have  been reclassified to conform to the
presentation for 1995.
 
                                      F-8
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3.  INVENTORIES
    Inventories at December 31 consist of the following:
 
<TABLE>
<CAPTION>
                                                            1994      1995
                                                          --------  --------
<S>                                                       <C>       <C>
Raw materials...........................................  $ 55,452  $ 36,256
Finished goods..........................................   279,546   238,603
                                                          --------  --------
                                                          $334,998  $274,859
                                                          --------  --------
                                                          --------  --------
</TABLE>
 
4.  PROPERTY, PLANT AND EQUIPMENT
    Property, plant and equipment at December 31 consists of the following:
 
<TABLE>
<CAPTION>
                                                         1994        1995
                                                      ----------  ----------
<S>                                                   <C>         <C>
Machinery and equipment.............................  $4,608,488  $4,942,753
Leasehold improvements, furniture and fixtures......     911,333   1,105,851
Construction in progress............................     354,894   1,650,353
                                                      ----------  ----------
                                                       5,874,715   7,698,957
Less accumulated depreciation and amortization......   3,737,468   4,157,495
                                                      ----------  ----------
                                                      $2,137,247  $3,541,462
                                                      ----------  ----------
                                                      ----------  ----------
</TABLE>
 
5.  JOINT VENTURES AND OTHER AGREEMENTS
    In order  to commercialize  its vitrification  technology more  rapidly  and
cost-effectively,  the  Company has  developed several  joint venture  and other
arrangements. The following is a summary of those relationships:
 
  BNFL INC.
    On November  7,  1995, the  Company  and BNFL  Inc.  (BNFL) entered  into  a
strategic  alliance agreement.  BNFL is the  U.S. subsidiary  of British Nuclear
Fuels plc, a United Kingdom-based company experienced in processing and treating
high level radioactive  waste. Under the  terms of the  strategic alliance,  the
Company  and BNFL have agreed  to jointly pursue up  to five major United States
Department of Energy (DOE) waste treatment projects. The terms of the  strategic
alliance provide that BNFL pay the Company a teaming fee of $1 million each time
the  two  companies  agree  to exclusively  pursue  together  a  waste treatment
project. Upon the  execution of  the strategic alliance  agreement, the  Company
received  and recognized as revenue a $1 million fee for its agreement to pursue
a project exclusively with BNFL at the DOE's Hanford, Washington facility.
 
    As part of the strategic alliance, BNFL invested $10 million in the  Company
in  the form of a convertible debenture (see  note 10) and agreed to provide the
Company with research and development funding of at least $500,000 per year over
the next five years.
 
  VITRITEK ENVIRONMENTAL, INC.
    Through a  joint venture  with Vitritek  Holdings Company  L.L.C.  (Vitritek
Holdings),  a privately-held entity, the  Company has extended its vitrification
technology to non-radioactive hazardous waste. The joint venture entity,  called
Vitritek  Environmental, Inc. ("Vitritek"), is 50%  owned by each of the Company
and Vitritek Holdings. The  joint venture, formed  in December 1993,  represents
the  consolidation  of  co-licensing  rights  to  non-radioactive  vitrification
technologies previously acquired by the Company and Vitritek Holdings. Under the
terms of the joint venture arrangement, all funding requirements and all profits
are shared equally.
 
    The Company's investment in, and advances to, Vitritek at December 31,  1994
and  1995 were $1,837,323 and $1,121,027, respectively. As of December 31, 1995,
Vitritek had  assets  of $2,697,136  and  liabilities of  $3,500,000  (including
$1,750,000  due to the Company). For the years ended December 31, 1994 and 1995,
Vitritek had net sales of $105,173 and $678,989, respectively, and net losses of
$891,152 and $1,997,655, respectively. For the years ended December 31, 1994 and
1995, the Company recognized its proportionate share of loss in the consolidated
statement of operations after intercompany eliminations.
 
                                      F-9
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
5.  JOINT VENTURES AND OTHER AGREEMENTS (CONTINUED)
  DURACHEM, INC.
 
    In  September   1994,   the   Company   and   Chem-Nuclear   Systems,   Inc.
(Chem-Nuclear),  a subsidiary of WMX Technologies,  Inc., formed a joint venture
to design,  build and  operate vitrification  facilities to  process  commercial
radioactive  waste  for disposal,  including  low-level radioactive  wastes from
nuclear  power   plants,  hospitals,   research  laboratories   and   industrial
facilities.  The Company will contribute 45%  of facility construction costs and
share proportionately in  the venture's profits  or losses. The  new venture  is
operating,  as a limited  partnership, under the  name "DuraChem." The Company's
investment in,  and advances  to, DuraChem  at  December 31,  1994 and  1995  of
$580,448  and $2,938,051, respectively, related to construction of a facility in
Barnwell, South Carolina.
 
6.  ACQUISITION OF DURATHERM, INC.
    In November 1995, the Company acquired 80% of the outstanding capital  stock
of   Bird  Environmental   Gulf  Coast,   Inc.,  since   named  DuraTherm,  Inc.
("DuraTherm"),  from  Bird  Environmental  Technologies,  Inc.,  a  wholly-owned
subsidiary   of  Bird   Corporation  ("Bird")   for  one   dollar  and  incurred
approximately $260,000  of  transaction costs.  DuraTherm  owns and  operates  a
hazardous waste facility using thermal desorption technology in San Leon, Texas.
In  connection with the acquisition, Bird contributed approximately $1.3 million
of cash to DuraTherm  immediately prior to the  acquisition to fund  DuraTherm's
working capital deficit.
 
    The remaining 20% of the outstanding capital stock of the Company is held by
certain  individuals (the "Minority Shareholders")  who developed the technology
and have  operated and  will  continue to  operate  the facility.  The  Minority
Shareholders  have entered  into employment  agreements providing  for incentive
compensation tied directly  to the  financial performance of  the facility.  The
Company  has entered  into a  stockholders' agreement  pursuant to  which, among
other terms and conditions, the Company has agreed to invest up to $5.1  million
(of  which up to $2.7 million is for capital improvements and up to $2.4 million
is for  working  capital)  in  DuraTherm in  exchange  for  preferred  stock  of
DuraTherm.  The Company provided approximately $645,000 of the capital needed by
DuraTherm during the fourth quarter of 1995 and will make the balance  available
during the first quarter of 1996. The Company expects the plant to reopen during
the second quarter of 1996. As part of the purchase transaction the Company also
acquired,  through a licensing arrangement, the  exclusive rights to the thermal
desorption technology used by the facility.
 
    The Minority Shareholders have the right to "put" their stock to the Company
at fair market value beginning in  December 1999 or earlier upon the  occurrence
of certain events. The Company has the right to "call" the stock of the Minority
Shareholders at fair market value beginning in December 2001 or earlier upon the
occurrence of certain events.
 
    The  acquisition of DuraTherm was accounted for using the purchase method of
accounting. The  estimated  fair  value  of the  net  tangible  assets  acquired
exceeded  the purchase price at November 29, 1995. Accordingly, the net purchase
price in excess of the net carrying value of DuraTherm of approximately $238,000
was allocated  to property,  plant  and equipment.  The Company  determined  the
amount  of the  minority interest of  the subsidiary  based upon 20%  of the net
assets of DuraTherm at the date of acquisition.
 
    Pro forma results of operations of the Company for the years ended  December
31, 1994 and 1995, assuming the acquisition of DuraTherm had occurred on January
1, 1994, are as follows:
 
<TABLE>
<CAPTION>
                                                       1994         1995
                                                    -----------  -----------
<S>                                                 <C>          <C>
Revenues..........................................  $39,682,000  $43,276,000
Net loss..........................................   (2,508,000)  (1,379,000)
Loss per share....................................        (0.29)       (0.27)
</TABLE>
 
                                      F-10
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
6.  ACQUISITION OF DURATHERM, INC. (CONTINUED)
    The  plant was placed into operation  in February 1994 and ceased operations
in August 1995. As such, the plant  was not fully operational for either of  the
pro  forma  periods  presented. The  pro  forma  results of  operations  are not
indicative of the results that would have occurred had the capital  improvements
actually  been made by January 1994 or  had the plant operated during the entire
pro forma periods  presented or of  future results of  operation of the  Company
with DuraTherm under management and control of the Company's personnel.
 
7.  SHORT-TERM BORROWINGS
    The  Company has a revolving line of  credit agreement with a bank providing
for borrowings  of up  to $7,000,000  based upon  eligible amounts  of  accounts
receivable,  as  defined  in  the agreement.  Borrowings  outstanding  under the
agreement are due on demand and bear interest at the bank's prime interest  rate
plus  1% (9.5% at December  31, 1995). Borrowings outstanding  under the line of
credit are secured by the Company's accounts receivable, inventory and property,
plant and equipment. The line of  credit agreement requires the Company to  meet
certain  financial  covenants  and restricts  the  payment of  dividends  on the
Company's common  stock.  At December  31,  1994, the  Company  had  outstanding
borrowings  of $7,630,512 under the agreement.  At December 31, 1995, no amounts
were outstanding and  approximately $5.9  million of  borrowings were  available
under the line of credit agreement.
 
8.  ACCOUNTS PAYABLE AND ACCRUED EXPENSES
    Accounts  payable  and  accrued  expenses  at  December  31  consist  of the
following:
 
<TABLE>
<CAPTION>
                                                         1994        1995
                                                      ----------  ----------
<S>                                                   <C>         <C>
Accounts payable....................................  $2,129,761  $2,165,720
Accrued expenses....................................     508,934     846,999
Salaries and related costs..........................     788,541     861,994
Preferred stock dividend payable....................          --     320,000
                                                      ----------  ----------
                                                      $3,427,236  $4,194,713
                                                      ----------  ----------
                                                      ----------  ----------
</TABLE>
 
9.  LONG-TERM DEBT
    Long-term debt  consists  of  notes  payable to  a  bank  requiring  monthly
payments  of principal plus interest at the bank's prime rate plus 1 1/4% (9.75%
at December 31, 1995). The notes  payable are secured by the Company's  accounts
receivable,  inventory and property, plant and equipment. The notes payable have
aggregate annual maturities of $470,709 in 1996 and $36,000 in 1997.
 
10. CONVERTIBLE DEBENTURE
    In November 1995, in connection with the formation of a strategic  alliance,
the  Company  received proceeds  of  $9,830,280, net  of  debt issue  costs from
issuance of a $10 million convertible  debenture to BNFL. The debenture  accrues
interest  during the first  five years at the  one-year London Interbank Offered
Rate (LIBOR).  The  debenture and  the  accrued interest  are  convertible  into
1,381,575  shares of the Company's  common stock on or  before November 7, 2000.
The debenture is  to be repaid  in annual installments  over a five-year  period
commencing  on  November 8,  2000.  The conversion  and  repayment dates  can be
extended under certain circumstances. At December 31, 1995, the balance due BNFL
of $10,086,931 included accrued interest of $86,931.
 
    The estimated fair value of the  convertible debenture at December 31,  1995
was approximately $14 million.
 
                                      F-11
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
11. 8% CUMULATIVE CONVERTIBLE REDEEMABLE PREFERRED STOCK
    In  January 1995, the Company  issued for $16 million,  160,000 shares of 8%
Cumulative Convertible Redeemable Preferred Stock, par value $.01 per share (the
"Convertible Preferred Stock") and an option (the "Carlyle Option") to  purchase
up  to an additional 1.25  million shares of the  Company's common stock, at any
time prior to January  24, 1999 for $3.75  per share to investment  partnerships
sponsored  and  controlled by  The  Carlyle Group  ("Carlyle").  The Convertible
Preferred Stock is initially  convertible into the Company's  common stock at  a
conversion  price of $3 per share and,  if not previously converted, the Company
is required to redeem the outstanding Convertible Preferred Stock on January 24,
2002 for  $100 per  share plus  accrued  and unpaid  dividends. The  Company  is
required  to  pay  quarterly dividends  on  the Convertible  Preferred  Stock of
$320,000.
 
    The proceeds, net of offering expenses  of $1,309,974, from the issuance  of
the  Convertible Preferred Stock  and Carlyle Option  were $14,690,026, of which
$14,410,026 was allocated to  the Convertible Preferred  Stock and $280,000  was
allocated  to the fair value  of the Carlyle Option.  The difference between the
carrying value of the  Convertible Preferred Stock and  the redemption value  is
being accreted through charges to stockholders' equity over a six-year period to
January 24, 2002.
 
    The  estimated fair value of the Convertible Preferred Stock at December 31,
1995 was approximately $53 million.
 
12. STOCK OPTION PLANS AND WARRANTS
    The Company  has  a  non-qualified  Stock Option  Plan  (the  "Plan")  which
authorizes  a committee of the  Board of Directors to  grant options to purchase
shares of the Company's common stock to directors, officers and employees of the
Company. The exercise price of such options may not be less than 85% of the fair
market value of the common  stock on the date of  grant and the exercise  period
may  not be more than ten years after such date. Changes in options and warrants
outstanding, options and warrants exercisable  and shares reserved for  issuance
are as follows:
 
<TABLE>
<CAPTION>
                                                      PRICE RANGE   NUMBER OF
                                                       PER SHARE     SHARES
                                                      ------------  ---------
<S>                                                   <C>           <C>
Balance, December 31, 1992..........................  $1.00 - 3.50  1,060,900
  Granted...........................................   3.50 - 4.00    555,000
  Exercised.........................................   1.00 - 3.50    (40,400)
                                                                    ---------
Balance, December 31, 1993..........................   1.00 - 4.00  1,575,500
  Granted...........................................   3.50 - 3.88    949,000
  Exercised.........................................   1.50 - 3.50     (7,000)
  Terminated........................................   1.50 - 3.75    (27,500)
                                                                    ---------
Balance, December 31, 1994..........................   1.00 - 4.00  2,490,000
  Granted...........................................          2.97    173,401
  Carlyle Option....................................          3.75  1,250,000
  Exercised.........................................   1.00 - 4.00   (716,103)
  Terminated........................................   1.50 - 3.75     (2,500)
                                                                    ---------
Balance, December 31, 1995..........................   1.00 - 4.00  3,194,798
                                                                    ---------
                                                                    ---------
</TABLE>
 
    As  of  December  31,  1995,  2,534,698  of  the  options  and  warrants are
exercisable. At December 31, 1995, the Company has reserved 9,909,706 shares for
issuance of  options, warrants  and securities  convertible into  the  Company's
common stock.
 
                                      F-12
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
13. INCOME TAXES
    The  provision for income taxes for the  years ended December 31, 1993, 1994
and 1995 consists of the following:
 
<TABLE>
<CAPTION>
                                                     1993     1994      1995
                                                    -------  -------  --------
<S>                                                 <C>      <C>      <C>
Current:
  State...........................................  $73,331  $11,487  $ 50,230
  Federal.........................................       --       --    50,696
                                                    -------  -------  --------
                                                    $73,331  $11,487  $100,926
                                                    -------  -------  --------
                                                    -------  -------  --------
</TABLE>
 
    The provision for income taxes for the years ended December 31, 1993,  1994,
and  1995 is reconciled to the amount computed by applying the statutory Federal
income tax rate to income (loss) before income taxes and proportionate share  of
loss of joint venture as follows:
 
<TABLE>
<CAPTION>
                                                      1993       1994       1995
                                                    ---------  ---------  ---------
<S>                                                 <C>        <C>        <C>
Federal income tax at statutory rate..............  $(413,000) $ 200,000  $ 809,000
State income taxes, net of Federal tax benefit....     73,331     11,487     33,152
Increase in (use of) net operating loss
 carryforwards....................................    413,000   (200,000)  (741,226)
                                                    ---------  ---------  ---------
                                                    $  73,331  $  11,487  $ 100,926
                                                    ---------  ---------  ---------
                                                    ---------  ---------  ---------
</TABLE>
 
    The  tax  effects of  temporary differences  that  give rise  to significant
portions of the deferred  tax assets and liabilities  at December 31 consist  of
the following:
 
<TABLE>
<CAPTION>
                                                       1994       1995
                                                    ----------  ---------
<S>                                                 <C>         <C>
Allowance for doubtful accounts...................  $   38,000  $  27,000
Capitalized inventory costs.......................      50,000     52,000
Proportionate share of loss in investee company...     125,000    446,000
Accelerated depreciation..........................    (513,000)  (611,000)
Net operating loss carryforward...................   1,521,000    863,000
Alternative minimum tax...........................          --     20,000
Other.............................................          --      3,000
                                                    ----------  ---------
                                                     1,221,000    800,000
Less valuation allowance..........................   1,221,000    800,000
                                                    ----------  ---------
                                                    $       --  $      --
                                                    ----------  ---------
                                                    ----------  ---------
</TABLE>
 
    In assessing the realizability of deferred tax assets, management considered
whether it was more likely than not that some portion or all of the deferred tax
assets  will be realized. The ultimate realization of the deferred tax assets is
dependent upon the generation of future  taxable income during periods in  which
temporary differences become deductible. Management considered income taxes paid
during  the previous three  years and projected future  taxable income in making
this  assessment.  Based  upon  the  level  of  historical  taxable  income  and
projections  for future taxable  income over the periods  in which the temporary
differences are deductible, management has established a valuation allowance  at
December 31, 1995 of $800,000.
 
    At  December 31, 1995,  the Company has net  operating loss carryforwards of
approximately $2.2 million which are available to offset future taxable earnings
of the Company through 2008. Approximately $1.1 million of the $2.2 million  net
operating  loss carryfoward is available  as the result of  the exercise of non-
qualified stock  options  by  employees  of the  Company.  Income  tax  benefits
resulting from utilization of this portion of the net operating loss will result
in  a credit  to capital  in excess  of par.  Utilization of  approximately $1.6
million of the  $2.2 million  net operating loss  carryforward is  subject to  a
separate return limitation, whereby it is only available to offset earnings from
one of the Company's subsidiaries.
 
                                      F-13
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
14. PROFIT SHARING PLAN
    The  Company maintains a  Profit Investment Plan  (the "Plan") for employees
who have  completed one  year of  service  with the  Company. The  Plan  permits
pre-tax  contributions to the Plan by participants pursuant to Section 401(k) of
the Internal Revenue Code of 1% to 14% of base compensation. The Company matches
25% of the participants' eligible contributions based on a formula set forth  in
the  Plan and may make additional matching contributions. Employer contributions
vest at a rate of 20% per year of service. The Company's matching  contributions
were  $73,000, $74,000 and $162,000 for the  years ended December 31, 1993, 1994
and 1995, respectively.
 
15. BUSINESS AND CREDIT CONCENTRATIONS
    The Company's  revenues are  derived primarily  from utilities  and  through
subcontracts  from  a  combination  of DOE  contractors  and  subcontractors. At
December 31, 1995, approximately 87%  of the Company's accounts receivable  were
due from these entities. Accounts receivable and costs and estimated earnings in
excess  of billings  on uncompleted  contracts relating  to DOE  contractors and
subcontractors amounted to $2,226,023  and $2,857,336 at  December 31, 1994  and
$5,115,785  and  $7,591,628 at  December 31,  1995,  respectively. In  1993, two
customers comprised 20% and 15% of  the Company's annual revenues. In 1994,  one
customer  comprised  23%  of  the  Company's  annual  revenues.  In  1995, three
customers  comprised  23%,  17%  and  16%  of  the  Company's  annual  revenues,
respectively. Revenues from DOE contracts and subcontracts were 13%, 23% and 35%
of  annual  revenues for  the  years ended  December  31, 1993,  1994  and 1995,
respectively.
 
    The Company  estimates  an allowance  for  doubtful accounts  based  on  the
creditworthiness  of  its customers,  as  well as  general  economic conditions.
Consequently, an  adverse change  in those  factors could  affect the  Company's
estimate of its bad debts.
 
16. COMMITMENTS AND CONTINGENCIES
 
  ROYALTY AGREEMENTS
 
    The  Company  has entered  into an  exclusive  licensing agreement  with the
owners of  the  vitrification technology,  pursuant  to which  the  owners  have
granted  to the  Company the exclusive  license and rights  to all vitrification
technology and  process  patents which  they  developed. The  exclusive  license
agreement  expires 17 years after the last  licensed patent is granted, which at
this time  will be  in 2012.  The agreement  provides for  a guaranteed  minimum
royalty  of $100,000 per year throughout the  term of the agreement. Pursuant to
the agreement, royalty  expense was  limited to $100,000  in each  of the  years
ended  December  31, 1993,  1994 and  1995.  Beginning in  1996, the  Company is
obligated to make payments of 1% to 3% of net sales values, as defined. Assuming
the Company achieves a net sales value  in 1996 equal to that achieved in  1995,
royalty expense will be approximately $260,000.
 
    The  Company also licenses  the rights to  the thermal desorption technology
used in the processing of petrochemical waste by DuraTherm from the inventor  of
such  technology. The Company  and DuraTherm are  co-licensees under the license
agreement and  are  collectively  obligated  to  pay  to  the  inventor  of  the
technology an annual royalty payment equal to the greater of (i) $50,000 or (ii)
1%  of the net revenues  generated from the operation  of the desorber equipment
(excluding net  revenues  generated from  equipment  acquired in  the  DuraTherm
acquisition)  incorporating  the technology  and  5% of  the  sales of  any such
equipment.
 
                                      F-14
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONCLUDED)
 
16. COMMITMENTS AND CONTINGENCIES (CONTINUED)
  LEASES
 
    The Company  has  several noncancellable  facility  leases which  expire  at
various  dates and,  in some  cases, have  options to  extend their  terms. Rent
expense approximated  $316,000,  $303,000  and  $315,000  for  the  years  ended
December 31, 1993, 1994 and 1995, respectively.
 
    The  following is a schedule of future minimum annual lease payments for all
long-term operating leases as of December 31, 1995:
 
<TABLE>
<S>                                                                <C>
1996.............................................................  $229,000
1997.............................................................    14,000
                                                                   --------
                                                                   $243,000
                                                                   --------
                                                                   --------
</TABLE>
 
  CLOSURE BOND
 
    Under the State of Texas Civil Statute, the Company is required to fund,  in
the  form of  a closure  bond, approximately  $1,936,000 over  a ten-year period
which will  be available  to cover  closure expenses  of the  DuraTherm  thermal
desorption  facility in San  Leon, Texas, when  and if required.  The funding is
maintained in an interest bearing trust account and as of December 31, 1995, the
trust balance  was approximately  $525,000.  Such amount  is included  as  other
assets in the Company's consolidated balance sheet.
 
  LEGAL PROCEEDINGS
 
    The  Company is involved in various claims  and legal actions arising in the
ordinary course  of  business.  In  the  opinion  of  management,  the  ultimate
disposition  of these  matters will  not have a  material adverse  effect on the
Company's consolidated financial position or results of operations.
 
17. SUPPLEMENTAL CASH FLOW INFORMATION
    In 1993, the Company acquired certain rights to medical and hazardous  waste
technologies  from an unrelated third party for  a warrant valued at $500,000 to
purchase 500,000 shares of the Company's common stock through September 30, 1997
at $4.00 per share.
 
    In 1993, the Company acquired certain rights to asbestos waste  technologies
in  exchange  for 187,500  shares  of the  Company's  common stock.  The Company
contributed its interest  in the  technology rights  to Vitritek  Environmental,
Inc.  (see note 5) in exchange for a $750,000 note bearing interest at the prime
rate  plus  1%.  The  technology   rights  were  previously  owned  by   certain
shareholders of Vitritek Environmental, Inc.
 
18. SUBSEQUENT EVENT
    On  April 16, 1996, the stockholders of  the Company approved an increase to
the authorized number of  shares of common stock  from 20,000,000 to  35,000,000
shares.
 
                                      F-15
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors
Bird Environmental Gulf Coast, Inc.:
 
    We  have audited  the accompanying  statements of  operations, stockholders'
equity and cash flows of Bird Environmental Gulf Coast, Inc. for the year  ended
December 31, 1994 and the eleven months ended November 30, 1995. These financial
statements   are   the   responsibility  of   the   Company's   management.  Our
responsibility is to express an opinion  on these financial statements based  on
our audits.
 
    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In  our opinion, the statements of operations, stockholders' equity and cash
flows referred to above present fairly, in all material respects, the results of
operations and cash flows  of Bird Environmental Gulf  Coast, Inc. for the  year
ended  December  31, 1994  and the  eleven  months ended  November 30,  1995, in
conformity with generally accepted accounting principles.
 
                                                   KPMG Peat Marwick LLP
 
Baltimore, Maryland
January 20, 1996
 
                                      F-16
<PAGE>
                      BIRD ENVIRONMENTAL GULF COAST, INC.
                            STATEMENTS OF OPERATIONS
     YEAR ENDED DECEMBER 31, 1994 AND ELEVEN MONTHS ENDED NOVEMBER 30, 1995
 
<TABLE>
<CAPTION>
                                                                                1994         1995
                                                                             -----------  -----------
<S>                                                                          <C>          <C>
Net sales..................................................................  $ 3,714,583  $ 2,858,370
Cost of sales..............................................................    6,221,892    5,491,560
                                                                             -----------  -----------
Gross loss.................................................................   (2,507,309)  (2,633,190)
Selling, general and administrative expenses...............................    1,053,723    1,124,153
Reserve with respect to property, plant and equipment......................           --   12,168,746
                                                                             -----------  -----------
Net loss...................................................................  $(3,561,032) $(15,926,089)
                                                                             -----------  -----------
                                                                             -----------  -----------
</TABLE>
 
                       STATEMENTS OF STOCKHOLDERS' EQUITY
     YEAR ENDED DECEMBER 31, 1994 AND ELEVEN MONTHS ENDED NOVEMBER 30, 1995
 
<TABLE>
<CAPTION>
                                                                         ADDITIONAL
                                                                           PAID-IN      ACCUMULATED
                                                         COMMON STOCK      CAPITAL        DEFICIT          TOTAL
                                                         -------------  -------------  --------------  --------------
<S>                                                      <C>            <C>            <C>             <C>
Balance, December 31, 1993.............................    $       7    $   5,755,817  $   (1,597,773) $    4,158,051
  Capital contribution by Bird Environmental
   Technologies, Inc...................................           --       13,109,362              --      13,109,362
  Net loss.............................................           --               --      (3,561,032)     (3,561,032)
                                                                  --
                                                                        -------------  --------------  --------------
Balance, December 31, 1994.............................            7       18,865,179      (5,158,805)     13,706,381
  Capital contribution by Bird Environmental
   Technologies, Inc...................................           --        2,247,756              --       2,247,756
  Net loss.............................................           --               --     (15,926,089)    (15,926,089)
                                                                  --
                                                                        -------------  --------------  --------------
Balance, November 30, 1995.............................    $       7    $  21,112,935  $  (21,084,894) $       28,048
                                                                  --
                                                                  --
                                                                        -------------  --------------  --------------
                                                                        -------------  --------------  --------------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-17
<PAGE>
                      BIRD ENVIRONMENTAL GULF COAST, INC.
                            STATEMENTS OF CASH FLOWS
     YEAR ENDED DECEMBER 31, 1994 AND ELEVEN MONTHS ENDED NOVEMBER 30, 1995
 
<TABLE>
<CAPTION>
                                                                                    1994          1995
                                                                                ------------  ------------
<S>                                                                             <C>           <C>
Cash flows from operating activities:
  Net loss....................................................................  $ (3,561,032) $(15,926,089)
  Adjustments to reconcile net loss to net cash used by operating activities:
    Depreciation and amortization.............................................     1,100,000     1,167,125
    Reserve with respect to property, plant and equipment.....................       --         12,168,746
    Changes in operating assets and liabilities:
      (Increase) decrease in accounts receivable..............................    (1,377,342)    1,377,342
      (Increase) decrease in inventories......................................       (15,951)       14,910
      Decrease in prepaid expenses............................................       143,347        41,900
      Increase in accounts payable............................................     1,196,125       211,768
      Increase (decrease) in accrued expenses.................................       246,782       (54,977)
                                                                                ------------  ------------
Net cash used in operating activities.........................................    (2,268,071)     (999,275)
                                                                                ------------  ------------
Cash flow from investing activities:
  Additions to property, plant and equipment..................................   (10,375,563)      (89,304)
  Increase in closure bond....................................................      (316,224)      (10,465)
                                                                                ------------  ------------
Net cash used in investing activities.........................................   (10,691,787)      (99,769)
                                                                                ------------  ------------
Cash provided by financing activities -- Capital contributions by Bird
 Environmental Technologies, Inc..............................................    13,109,362     2,247,756
                                                                                ------------  ------------
Net increase in cash..........................................................       149,504     1,148,712
Cash at beginning of period...................................................       --            149,504
                                                                                ------------  ------------
Cash at end of period.........................................................  $    149,504  $  1,298,216
                                                                                ------------  ------------
                                                                                ------------  ------------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-18
<PAGE>
                      BIRD ENVIRONMENTAL GULF COAST, INC.
                         NOTES TO FINANCIAL STATEMENTS
                    DECEMBER 31, 1994 AND NOVEMBER 30, 1995
 
1.  NATURE OF BUSINESS AND ACQUISITION BY GTS DURATEK, INC.
    Bird  Environmental Gulf  Coast, Inc.  (the "Company")  owns and  operates a
hazardous waste recycling  facility using thermal  desorption technology in  San
Leon,  Texas.  As of  November 30,  1995, the  Company has  suspended operations
pending completion of certain capital improvements which are intended to  enable
the  facility to  operate at  peak efficiency.  The facility  is expected  to be
operational during  the second  quarter  of 1996.  The Company's  customers  are
principally engaged in the petrochemical industry.
 
    On  November 29,  1995, GTS  Duratek, Inc.  acquired 80%  of the outstanding
common stock  of  the Company  from  Bird Environmental  Technologies,  Inc.,  a
wholly-owned subsidiary of Bird Corporation.
 
    The  remaining 20% of the outstanding capital  stock of the Company is owned
by  certain  individuals  (the   "Minority  Shareholders")  who  developed   the
technology  and have  operated and  will continue  to operate  the facility. The
Minority Shareholders  have entered  into  employment agreements  providing  for
incentive  compensation  tied  directly  to  the  financial  performance  of the
facility. GTS Duratek, Inc. has entered into a stockholders' agreement with  the
Minority  Shareholders pursuant to  which, among other  terms and conditions, it
agreed to invest up to $5.1 million in the Company as needed, up to $2.4 million
of which  will be  used for  general working  capital purposes  and up  to  $2.7
million of which will be used for capital and plant start-up expenditures.
 
    As  part of  the acquisition transaction,  GTS Duratek,  Inc. also acquired,
through a  licensing arrangement  with  one of  the Minority  Shareholders,  the
exclusive  rights to the  patented technology used by  the Company's facility to
process and treat hazardous waste.
 
    Effective December 12, 1995, the Company changed its name to DuraTherm, Inc.
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES
 
  INVENTORIES
 
    Inventories, principally  consisting  of  supplies  used  in  the  recycling
process, are stated at the lower of cost or market. Cost is determined using the
first-in, first-out method.
 
  PROPERTY, PLANT AND EQUIPMENT
 
    Property,  plant and equipment are stated at cost. Depreciation on plant and
equipment is calculated on  the straight-line method  over the estimated  useful
lives of the assets, which range from five to fifteen years.
 
    On  November 29, 1995, the Company has  recorded a reserve for the property,
plant and equipment to  reflect the "push down"  of Bird Corporation's  adjusted
sales prices to GTS Duratek, Inc.
 
  INCOME TAXES
 
    Deferred  tax  assets  and liabilities  are  recognized for  the  future tax
consequences  attributable  to  differences  between  the  financial   statement
carrying  amounts of  existing assets and  liabilities and  their respective tax
bases and operating loss and tax  credit carryforwards. Deferred tax assets  and
liabilities  are measured using  enacted tax rates expected  to apply to taxable
income in the  years in  which those temporary  differences are  expected to  be
recovered  or settled. The  effect on deferred  tax assets and  liabilities of a
change in tax  rates is recognized  in income  in the period  that includes  the
enactment date.
 
  USE OF ESTIMATES
 
    Management  of the  Company has made  a number of  estimates and assumptions
relating to  the  reporting  of  assets and  liabilities  and  their  respective
disclosures  to prepare these financial  statements in conformity with generally
accepted accounting principles. Actual  results could differ significantly  from
those estimates.
 
                                      F-19
<PAGE>
                      BIRD ENVIRONMENTAL GULF COAST, INC.
                   NOTES TO FINANCIAL STATEMENTS (CONCLUDED)
 
3.  CLOSURE BOND
    The  Company is required under  State of Texas Civil  Statue to fund, in the
form of  a closure  bond, $1,936,619  over a  ten year  period. The  funding  is
maintained in an interest bearing trust account, in the Company's name, and will
be eventually used to cover closure expenses of the thermal desorption facility,
when  and if required. As of December 31,  1994 and November 30, 1995, the trust
balance was $316,224 and $326,689, respectively.
 
4.  INCOME TAXES
    During the year ended December 31, 1994 and eleven months ended November 30,
1995, the Company had net  operating losses. As a  result of the acquisition  of
80%  of the Company's common  stock by GTS Duratek,  Inc. any net operating loss
carryforwards at  November 30,  1995  will not  be  available to  reduce  future
taxable income of the Company.
 
5.  COMMITMENTS AND CONTINGENCIES
    The  Company is a  defendant in a  number of legal  matters certain of which
Bird Corporation has agreed  to indemnify the Company  and GTS Duratek, Inc.  Of
the  matters for which the Company is not indemnified, none are expected to have
any material adverse effect on the financial condition of the Company.
 
    In connection with the  Company's acquisition by GTS  Duratek, Inc. four  of
the  Company principal  employees entered  into four  year employment agreements
which generally can  be terminated  without cause upon  payment of  one year  of
severance.   The  agreements  also  provide  for   bonuses  in  excess  of  base
compensation in the event the Company  achieves certain levels of earnings  over
the period of the employment agreements.
 
                                      F-20
<PAGE>
                       GTS DURATEK, INC. AND SUBSIDIARIES
                  PRO FORMA FINANCIAL INFORMATION (UNAUDITED)
 
    The  pro forma financial information should  be read in conjunction with the
consolidated financial statements  and related  notes of GTS  Duratek, Inc.  and
subsidiaries (the "Company"), and the financial statements of Bird Environmental
Gulf Coast, Inc. ("DuraTherm"), included elsewhere herein.
 
    On  November 29, 1995,  the Company acquired 80%  of the outstanding capital
stock of DuraTherm  from Bird Environmental  Technologies, Inc., a  wholly-owned
subsidiary  of  Bird  Corporation  ("Bird") for  $1  and  incurred approximately
$260,000 of transaction  costs. DuraTherm  owns and operates  a hazardous  waste
facility  using thermal desorption technology in  San Leon, Texas. In connection
with the acquisition, Bird  agreed to contribute  approximately $1.3 million  of
cash  to  DuraTherm immediately  prior to  the  acquisition to  fund DuraTherm's
working capital deficit. The remaining 20%  of the outstanding capital stock  of
the  Company is  held by certain  individuals (the  "Minority Shareholders") who
developed the technology  and have  operated and  will continue  to operate  the
facility.  The  Minority Shareholders  have  entered into  employment agreements
providing for incentive compensation tied directly to the financial  performance
of the facility. The Company has entered into a stockholders' agreement pursuant
to  which, among other terms and conditions, the Company has agreed to invest up
to $5.1 million in  DuraTherm in exchange for  preferred stock of DuraTherm.  Of
the  $5.1 million, up to $2.4 million  will be used for working capital purposes
and the balance,  of up  to $2.7  million, will be  used for  capital and  plant
start-up  expenditures. The Company began making the capital improvements needed
by DuraTherm  during the  fourth quarter  of 1995  and expects  to complete  the
capital improvements in the first quarter of 1996. The Company expects the plant
to  be operational during the  second quarter of 1996.  The Company will use its
internal funds  for  the  investment  in DuraTherm.  As  part  of  the  purchase
transaction  the  Company also  acquired, through  a licensing  arrangement, the
exclusive rights to the thermal desorption technology used by the facility.
 
    The aggregate  purchase  price for  the  80%  interest in  DuraTherm  is  as
follows:
 
<TABLE>
<S>                                                                     <C>
Cash purchase price...................................................  $      1
Transaction cost......................................................   259,999
                                                                        --------
                                                                        $260,000
                                                                        --------
                                                                        --------
</TABLE>
 
    The  acquisition of DuraTherm was accounted for using the purchase method of
accounting. The  estimated  fair  value  of the  net  tangible  assets  acquired
exceeded  the purchase price at November 29, 1995. Accordingly, the net purchase
price in excess of the net carrying value of DuraTherm of approximately $238,000
was allocated to property, plant and  equipment. The Company has determined  the
amount  of the  minority interest of  the subsidiary  based upon 20%  of the net
assets of DuraTherm at the date of acquisition.
 
    The pro  forma  consolidated statement  of  operations for  the  year  ended
December  31, 1995 gives effect to the  Company's acquisition of DuraTherm as if
the transaction had occurred on  January 1, 1995. Depreciation and  amortization
amounts have been adjusted assuming the $2.7 million of capital improvements had
been made as of January 1, 1995 and the plant was operational on that date.
 
    The  plant was placed into operation  in February 1994 and ceased operations
in August 1995. As such, the plant  was not fully operational for the pro  forma
period  presented. The  pro forma  consolidated statement  of operations  is not
indicative of the results that would have occurred had the capital  improvements
actually  been made by January 1995 or  had the plant operated during the entire
pro forma period presented or of future consolidated results of operation of the
Company with DuraTherm under management and control of the Company's personnel.
 
                                      F-21
<PAGE>
                               GTS DURATEK, INC.
                 PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
                          YEAR ENDED DECEMBER 31, 1995
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                           PRO FORMA        PRO FORMA
                                               COMPANY     DURATHERM      ADJUSTMENTS       COMBINED
                                             -----------  ------------  ----------------   -----------
<S>                                          <C>          <C>           <C>                <C>
Revenues...................................  $40,418,066  $  2,858,370  $         --       $43,276,436
Cost of revenues...........................   32,220,569     5,491,560      (873,307)(1)    36,838,822
                                             -----------  ------------  ----------------   -----------
Gross profit (loss)........................    8,197,497    (2,633,190)      873,307         6,437,614
Selling, general and administrative
 expenses..................................    5,875,688     1,124,153            --         6,999,841
Reserve with respect to property, plant and
 equipment.................................           --   (12,168,746)   12,168,746(2)             --
                                             -----------  ------------  ----------------   -----------
Income (loss) from operations..............    2,321,809   (15,926,089)   13,042,053          (562,227)
Interest income (expense), net.............       57,453            --            --            57,453
                                             -----------  ------------  ----------------   -----------
Income (loss) before income taxes and
 proportionate share of loss of joint
 venture...................................    2,379,262   (15,926,089)   13,042,053          (504,774)
Income taxes...............................      100,926            --       (50,696)(3)        50,230
                                             -----------  ------------  ----------------   -----------
Income (loss) before proportionate share of
 loss of joint venture.....................    2,278,336   (15,926,089)   13,092,749          (555,004)
Proportionate share of loss of joint
 venture...................................     (824,025)           --            --          (824,025)
                                             -----------  ------------  ----------------   -----------
Net income (loss)..........................    1,454,311   (15,926,089)   13,092,749        (1,379,029)
Preferred stock dividends and charges for
 accretion.................................   (1,394,064)           --            --        (1,394,064)
                                             -----------  ------------  ----------------   -----------
Net income (loss) attributable to common
 stockholders..............................  $    60,247  $(15,926,089) $ 13,092,749       $(2,773,093)
                                             -----------  ------------  ----------------   -----------
                                             -----------  ------------  ----------------   -----------
Net income (loss) per share................  $      0.01                                   $     (0.27)
Weighted average shares....................    8,820,131                                     8,820,131
</TABLE>
 
NOTES TO PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS:
 
(1) To adjust depreciation and amortization expense as follows:
 
<TABLE>
<S>                                                               <C>
Eliminate depreciation included in DuraTherm amounts............  $(1,167,125)
Adjusted depreciation for plant and equipment over 10 years.....      23,818
Depreciation of additional $2.7 million of plant and equipment
 over 10 years..................................................     270,000
                                                                  ----------
                                                                  $ (873,307)
                                                                  ----------
                                                                  ----------
</TABLE>
 
(2) To eliminate charge included in DuraTherm accounts as the basis of property,
    plant and equipment is adjusted in consolidation.
 
(3) To adjust income tax provision to eliminate Federal income taxes.
 
                                      F-22
<PAGE>
BACK INSIDE COVER:
[photo of DuraChem operating the Duramelter
3000-TM- at Chem-Nuclear's Barnwell
Facility to be inserted]
 
DuraChem operates DuraMelter 3000SC-TM-
at Chem-Nuclear's Barnwell Facility
 
                                          [schematic diagram of waste volume
                                          reduction by 30 times to be inserted]
 
                                          Volume Reduction of up to 97%
 
[photo of DuraTherm recycling center in San
        Leon, Texas to be inserted]
 
DuraTherm recycling center in San Leon,
               Texas
<PAGE>
- -------------------------------------------
                                     -------------------------------------------
- -------------------------------------------
                                     -------------------------------------------
 
    NO  DEALER,  SALESPERSON OR  OTHER PERSON  HAS BEEN  AUTHORIZED TO  GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS  IN
CONNECTION  WITH THE OFFERING COVERED BY THIS PROSPECTUS. IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY, THE  SELLING STOCKHOLDERS OR  THE UNDERWRITERS. THIS  PROSPECTUS
DOES  NOT CONSTITUTE AN OFFER TO SELL, OR  A SOLICITATION OF AN OFFER TO BUY THE
COMMON STOCK IN ANY JURISDICTION WHERE, OR TO ANY PERSON TO WHOM IT IS  UNLAWFUL
TO  MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR
ANY SALE MADE HEREUNDER  SHALL, UNDER ANY  CIRCUMSTANCES, CREATE AN  IMPLICATION
THAT  THERE HAS NOT BEEN ANY CHANGE IN THE FACTS SET FORTH IN THIS PROSPECTUS OR
IN THE AFFAIRS OF THE COMPANY SINCE THE DATE THEREOF.
 
                                 --------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                PAGE
<S>                                           <C>
Prospectus Summary..........................          3
Risk Factors................................          6
Use of Proceeds.............................         11
Price Range of Common Stock.................         11
Dividend Policy.............................         11
Capitalization..............................         12
Selected Consolidated Financial Data........         13
Management's Discussion and Analysis of
 Results of Operations and Financial
 Condition..................................         14
Business....................................         18
Management..................................         35
Principal and Selling Stockholders..........         38
Description of Capital Stock................         40
Underwriting................................         42
Legal Matters...............................         43
Experts.....................................         43
Available Information.......................         43
Incorporation of Certain Documents by
 Reference..................................         44
Index to Financial Statements...............        F-1
</TABLE>
 
                                3,600,000 SHARES
                                     [LOGO]
 
                                  COMMON STOCK
 
                               ------------------
 
                                   PROSPECTUS
 
                               ------------------
 
                          DONALDSON, LUFKIN & JENRETTE
      SECURITIES CORPORATION
 
                            DEUTSCHE MORGAN GRENFELL
 
                          GRUNTAL & CO., INCORPORATED
 
                                 APRIL 22, 1996
 
- -------------------------------------------
                                     -------------------------------------------
- -------------------------------------------
                                     -------------------------------------------


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