- U.S. Department of Agriculture
- U.S. Department of Defense
- U.S. Department of Energy
- U.S. Department of Health and Human Services
- U.S. Department of Interior
- Federal Communications Commission
- Agency for Toxic Substances and Disease Registry
- Army Corp of Engineers
- Centers for Disease Control and Prevention
- National Institute for Occupational Safety and Health
- National Aeronautics and Space Administration
- Nuclear Regulatory Commission
- Tennessee Valley Authority
- U.S. Office of Personnel Management
- Argonne National Laboratory
- Brookhaven National Laboratory
- Fermi National Accelerator Laboratory
- Hanford Site
- Idaho National Laboratory
- Lawrence Livermore National Laboratory
- Los Alamos National Laboratory
- Oak Ridge National Laboratory
- Oak Ridge K-25 Gaseous Diffusion Plant
- Oak Ridge Institute for Science and Education
- Pacific Northwest National Laboratory
- Sandia National Laboratories
- Savannah River Plant
- Y-12 National Security Complex
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- Australian National Industries
- Bechtel, Inc.
- Bechtel Hanford, Inc.
- Bechtel Jacobs, LLC
- BWXT, LLC
- CH2M Hill, Inc.
- CP Coal, Inc.
- Deltech, Inc.
- Dynamic Sciences, Inc.
- Martin Marietta Energy Systems, Inc.
- M4 Environmental Management, Inc.
- Foster Wheeler, Inc.
- Foster Wheeler Environmental Corporation
- Lockheed Martin Energy Research Corporation
- Lockheed Martin Energy Systems
- Oak Ridge Associated Universities
- Oregon Environment and Technology Corp.
- Parallex, Inc.
- Premier, Inc.
- Recol Engineering, Inc.
- Remotec, Inc.
- Science Applications International Corporation
- Sparhawke Enterprises, Inc.
- The British Columbia Trade and Investment Corp.
- The Korean Energy Department
- The Russian Federation
- The S.M. Stoller Corporation
- UT-Batelle, LLC
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