| ARPA-E | Advanced Research Projects Agency–[Department of] Energy |
| ATWP | actual time of work performed |
| BRAC | base realignment and closure |
| CD | critical decision (e.g., CD-0, CD-1, CD-2, CD-3) |
| CERCLA | Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (Superfund) |
| CPCC | Central Plateau Cleanup Contract |
| D&D | decontamination and decommissioning |
| DOE | Department of Energy |
| DOE-EM | Department of Energy’s Office of Environmental Mangement |
| DOE-EM 413.3B | Department of Energy’s order Program and Project Management for the Acquisition of Capital Assets |
| EM | Department of Energy’s Office of Environmental Management |
| ESCM | End State Contracting Model |
| EVMS | Earned Value Management System |
| FAR | Federal Acquisition Regulation |
| FUDS | formerly used defense site |
| FY | fiscal year |
| GAO | Government Accountability Office |
| GDF | Gaseous Diffusion Facilities at Portsmouth and Paducah |
| ID | Idaho Site |
| IDIQ | indefinite delivery/indefinite quantity |
| IEC | Idaho Environmental Coalition, LLC |
| IMCC | Savannah River Mission Completion (Integrated Mission Completion) Contract |
| M&O | management and operating |
| MIE | major items of equipment |
| Moab | Moab Uranium Mill Tailings Remedial Action Project (Moab Site or Project) |
| NAS | National Academy of Sciences |
| NAVFAC | Naval Facilities Engineering Systems Command |
| NNSA | Department of Energy’s National Nuclear Security Agency |
| NRSB | Nuclear and Radiation Studies Board |
| NWP | North Wind Portage, Inc. |
| Oak Ridge/ORNL | Oak Ridge National Laboratory |
| OBC | outcomes-based contract |
| OMB | Office of Management and Budget |
| OMB Circular A-11 | Office of Management and Budget Circular A-11: Preparation, Submission, and Execution of the Budget |
| PARS | Project Assessment and Reporting System |
| PB | performance baseline |
| PBC | performance-based contract |
| PEMP | Project Evaluation and Measurement Plan |
| PM | project management |
| PMIAA | Program Management Improvement Accountability Act of 2016 |
| POP | period of performance |
| PORTS | Portsmouth Gaseous Diffusion Plant |
| R&D | research and development |
| RFP | request for proposal |
| S&T | science and technology |
| SRS | Savannah River Site |
| STWP | scheduled time of work performed |
| SWPF | Salt Waste Processing Facility |
| TD | Technology Development (program) |
| TPC | total project cost |
| Tri-Party | Hanford Federal Facility Agreement and Consent Order of 1989, or Tri-Party Agreement |