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| 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 | |
| EURATOM | European Atomic Energy Community | |
| FORATOM | Forum atomique européen | |
| HWR | Heavy water reactor | |
| IAEA-MEL | IAEA Marine Environment Laboratory | |
| ICTP | International Centre for Theoretical Physics | |
| ILO | International Labour Organisation | |
| INDC | International Nuclear Data Committee | |
| IOC | Intergovernmental Oceanographic Commission (UNESCO) | |
| ISO | International Organization for Standardization | |
| LWR | Light water reactor | |
| NEA | Nuclear Energy Agency of the OECD | |
| 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 | |
| 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 | |
| UNDP | United Nations Development Programme | |
| UNEP | United Nations Environment Programme | |
| UNESCO | United Nations Educational, Scientific and Cultural Organization | |
| UNIDO | United Nations Industrial Development Organization | |
| UNSCEAR | United Nations Scientific Committee on the Effects of Atomic Radiation | |
| WHO | World Health Organization | |
| WMO | World Meteorological Organization | |
| WWER | Water cooled and moderated energy reactor (former USSR) | |
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