| ADS | Accelerator-driven system |
| AECL | Atomic Energy of Canada Limited |
| AFIP | ATR full-size plate in center flux trap position |
| ANL | Argonne National Laboratory |
| ATR | Advanced Test Reactor |
| ATR-C | Advanced Test Reactor Critical Facility |
| ATR NSUF | Advanced Test Reactor National Scientific User Facility |
| BWXT | Babcock and Wilcox Technologies |
| BR2 | Belgian Reactor II (SCK·CEN, Mol, Belgium) |
| CA | Critical assemblies |
| CEA | Commissariat à l’Energie Atomique et aux Energies Alternatives |
| CEFR | China Experimental Fast Reactor |
| CERCA | Compagnie pour l’Etude et la Réalisation de Combustibles Atomiques |
| CFR | Code of Federal Regulations |
| CIAE | China Institute of Atomic Energy |
| cm | Centimeter |
| CNEA | Argentine National Commission of Atomic Energy |
| CNL | Canadian Nuclear Laboratories |
| CP-1 | Chicago Pile-1 |
| DOE | U.S. Department of Energy |
| DPRK | Democratic People’s Republic of Korea |
| EPA | U.S. Environmental Protection Agency |
| ESS | European Spallation Source |
| FD | Fuel development |
| FDP | Fuel Data Provider (see Appendix E) |
| FFA | Federal facility agreement |
| FFC | Fuel fabrication capability |
| FMWG | Fissile Material Working Group |
| FNR | Ford Nuclear Reactor |
| FP-1 and FP-2 | Full-sized fuel plate test-1 and test-2 |
| FRM-II | Forschungs-Neutronenquelle Heinz Maier-Leibnitz-II |
| FY | Fiscal year |
| GE | General Electric |
| GE-NTR | General Electric Nuclear Test Reactor |
| GTRI | Global Threat Reduction Initiative |
| GTRP | Global Threat Reduction Program |
| HAMP | HANARO Mini-Plate |
| HANARO | High-Flux Advanced Neutron Application Reactor (Deokjin-dong) |
| HERACLES | Highly enriched European Reactors Action for their Conversion in a Low Enriched Solution |
| HEU | Highly enriched uranium |
| HFIR | High Flux Isotope Reactor (Oak Ridge) |
| HFR | High Flux Reactor (Petten) |
| HPRR | High performance research reactor |
| HT3R | High-Temperature Teaching & Test Reactor |
| IAEA | International Atomic Energy Agency |
| IB | Ice breaker |
| IBR2M | Induced Bed Reactor–2M |
| ID | Identification (See Appendix F) |
| IGORR | International Group on Research Reactors |
| IL | Interaction layer |
| ILL | Institut Laue-Langevin (Grenoble) |
| in. | Inch |
| INFCE | International Nuclear Fuel Cycle Evaluation |
| INL | Idaho National Laboratory |
| INVO | Iraq Nuclear Verification Office |
| IPFM | International Panel on Fissile Materials |
| IRE | Institute for Radio Elements |
| IREN | Intense Resonance Neutron pulsed source |
| IRIS | International Reactor Innovative and Secure |
| IRT | In-Reactor Thimble (Fast Test Reactor)/Iraqi Reactor |
| ISR | Independent strategic review |
| IVV | Water-cooled, water-moderated (Russian acronym) |
| JHR | Jules Horowitz Reactor (CEA-Cadarache) |
| JMTR | Japan Materials Testing Reactor (Oarai) |
| JSC “SSC RIAR” | Joint Stock Company State Scientific Center—Research Institute of Atomic Reactors |
| KAERI | Korea Atomic Energy Research Institute |
| kg | Kilogram |
| KJRR | Ki-Jang Research Reactor |
| km/s | Kilometer per second |
| KUCA | Kyoto University Critical Assembly |
| kW | Kilowatt |
| LEONIDAS | Low Enriched Option Network Initiative for the Development of a European Appropriate Solution |
| LEU | Low enriched uranium |
| LITR | Low-intensity testing reactor |
| µm | Micrometer |
| M3 | Material Management and Minimization (“M-cubed”), also MMM |
| MBIR | Multipurpose sodium-cooled fast neutron research reactor (Russian acronym) |
| MIR | Modernized international reactor |
| MIT | Massachusetts Institute of Technology |
| MITR-II | Massachusetts Institute of Technology Reactor (Boston) |
| MNSR | Miniature Neutron Source Reactor |
| MOX | Mixed oxide fuel |
| MP | Mini-plate |
| MTR | Materials test reactors |
| MURR | University of Missouri Research Reactor (Columbia) |
| MW | Megawatts |
| MYRRHA | Multi-purpose hYbrid Research Reactor for High-tech Applications |
| N/A | Not applicable |
| NAA | Neutron activation analysis |
| NAS | National Academy of Sciences, now the National Academies of Sciences, Engineering, and Medicine |
| NBSR | Neutron Beam Split-core Reactor |
| NCBJ | Narodowe Centrum Badan Jadrowych (National Center for Nuclear Research) |
| NCCP | Novosibirsk Chemical Concentrates Plant |
| NCNR | NIST Center for Neutron Research |
| NIKIET | Research and Development Institute of Power Engineering (Nauchno-issledovatel’skii institut energotekhniki) |
| NIST | National Institute of Standards and Technology |
| NNSA | National Nuclear Security Administration |
| NRG | Nuclear Research and Consultancy Group |
| NSC | National Security Council |
| NSS | Nuclear Security Summit |
| NSUF | Nuclear Science User Facility |
| NTD | Neutron transmutation doping |
| NTI | Nuclear Threat Initiative |
| NV | Naval reactor |
| OECD | Organisation for Economic Co-operation and Development |
| ORNL | Oak Ridge National Laboratory |
| ORR | Oak Ridge Research Reactor |
| OSTP | Office of Science and Technology Policy |
| PIE | Post-irradiation examination |
| PNNL | Pacific Northwest National Laboratory |
| PR | Pulsed reactor |
| PVD | Physical vapor deposition |
| RAS | Russian Academy of Sciences |
| RERTR | Reduced Enrichment for Research and Test Reactors |
| RHF | Réacteur à Haut Flux (Grenoble) |
| RIAR | Research Institute of Atomic Reactors (Dimitrovgrad) |
| RR | Research reactor |
| RRDB | Research Reactor Database |
| RRFM | European Research Reactor and Fuel Management Conference |
| RRRFR | Russian Research Reactor Fuel Return (Program) |
| SAFARI | South African Fundamental Atomic Research Installation |
| SCK·CEN | Studiecentrum voor Kernenergie·Centre d’Etudes Nucléaire |
| SLOWPOKE | Safe Low-Power Kritical Experiment |
| SNS | Spallation Neutron Source |
| SS | Steady-state reactor |
| TAPIRO | TAratura PIla Rapida a potenza 0 |
| TEM | Transmission electron microscopy |
| TOUTATIS | Traitement Optimisé de l’Uranium et Thermique Améliorée pour une Technologie Intégrant la Sûreté |
| TREAT | Transient Reactor Test Facility |
| TRIGA | Training, Research, Isotopes, General Atomics |
| TUM | Technische Universität München |
| U.K. | United Kingdom |
| UM | University of Michigan |
| USNRC | U.S. Nuclear Regulatory Commission |
| U.S. | United States |
| USHPRR | U.S. high performance research reactor |
| VENUS | Vulcan Experimental Nuclear Study |
| VIC | Vienna International Center |
| VNIIEF | All-Russian Scientific Research Institute of Experimental Physics (Vsesoyuznyy nauchnoissledovatel’skiy institut eksperimental’noy fiziki) |
| vol. | Volume |
| W | Watt |
| W-HEU | Weapon-grade highly enriched uranium |
| wt | Weight |
| Y-12 | Y-12 National Security Complex |
| YTC | Years to conversion |
| ZPTF | Zero Power Test Facility |
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