| ABACC | Brazilian-Argentine Agency for Accounting and Control of Nuclear Materials |
| ARCAL | Regional Co-operative Arrangements for the Promotion of Nuclear Science and Technology in Latin America |
| BWR | Boiling water reactor |
| CANDU | Canadian deuterium-uranium (reactor) |
| CRP | Co-ordinated research programme |
| EC | European Commission |
| ESCAP | United Nations Economic and Social Commission for Asia and the Pacific |
| EU | European Union |
| EURATOM | European Atomic Energy Community |
| FAO | Food and Agriculture Organization of the United Nations |
| FORATOM | Forum atomique européen |
| HTGR | High temperature gas cooled reactor |
| HWR | Heavy water reactor |
| IAEA-MEL | IAEA Marine Environment Laboratory |
| ICAO | International Civil Aviation Organization |
| ICRP | International Commission on Radiological Protection |
| ICRU | International Commission on Radiation Units and Measurements |
| ICTP | International Centre for Theoretical Physics |
| IEA | International Energy Agency (OECD) |
| IIASA | International Institute for Applied Systems Analysis |
| ILO | International Labour Organisation |
| IMO | International Maritime Organization |
| INDC | International Nuclear Data Committee |
| INIS | International Nuclear Information System |
| ISO | International Organization for Standardization |
| LWGR | Light water graphite moderated reactor |
| LWR | Light water reactor |
| NDA | Non-destructive assay |
| NEA | Nuclear Energy Agency of the OECD |
| NUSS | The Agency s programme on nuclear safety standards for nuclear power plants |
| OAU | Organization for African Unity |
| OECD | Organisation for Economic Co-operation and Development |
| OLADE | Organización Latino-americana de Energía |
| OPANAL | Organismo para la Proscripción de las Armas Nucleares en América Latina y el Caribe |
| OPEC | Organization of Petroleum Exporting Countries |
| PAHO | Pan American Health Organization/WHO |
| PHWR | Pressurized heavy water reactor |
| PWR | Pressurized water reactor |
| RBMK | Light boiling water cooled graphite moderated pressure tube reactor (former USSR) |
| RCA | Regional Co-operative Agreement for Research, Development and Training Related to Nuclear Science and Technology |
| SQ | Significant quantity |
| UNCED | United Nations Conference on Environment and Development (1992) |
| UNCTAD | United Nations Conference on Trade and Development |
| UNDP | United Nations Development Programme |
| UNECE | United Nations Economic Commission for Europe |
| UNEP | United Nations Environment Programme |
| UNESCO | United Nations Educational, Scientific and Cultural Organization |
| UNIDO | United Nations Industrial Development Organization |
| UNIPEDE | International Union of Producers and Distributors of Electrical Energy |
| UNSCEAR | United Nations Scientific Committee on the Effects of Atomic Radiation |
| UNU | United Nations University |
| VIC | Vienna International Centre |
| WANO | World Association of Nuclear Operators |
| WEC | World Energy Council |
| WHO | World Health Organization |
| WMO | World Meteorological Organization |
| WTO | World Trade Organization |
| WWER | Water cooled and moderated energy reactor (former USSR) |