| Subject | Portuguese | English |
| gen. | Acordo entre a Comunidade Europeia da Energia Atómica, o Governo do Japão, o Governo da Federação da Rússia e o Governo dos Estados Unidos da América relativo à Cooperação nas Actividades de Projecto de Engenharia do Reactor Termonuclear Experimental Internacional | Agreement among the European Atomic Energy Community, the Government of Japan, the Government of the Russian Federation, and the Government of the United States of America on cooperation in the engineering design activities for the international thermonuclear experimental reactor |
| R&D., nucl.phys. | Comité de Coordenação dos Reactores Rápidos | Fast Reactors Coordinating Committee |
| R&D., nucl.phys. | Comité de Coordenação dos Reactores Rápidos | Coordinating Committee on Fast Reactors |
| energ.ind., nucl.phys. | família de reactores | reactor type |
| energ.ind., nucl.phys. | família de reactores | reactor line |
| nucl.phys. | física de reactores | reactor physics |
| nucl.phys. | Grupo de Trabalho sobre Segurança dos Reactores | Reactor Safety Working Group |
| nucl.phys. | instrumentação para reactor nuclear | nuclear reactor instrumentation |
| energ.ind., nucl.phys. | núcleo do reactor | reactor core |
| energ.ind. | reactor arrefecido a gás | gas-cooled reactor |
| tech., energ.ind., nucl.phys. | reactor avançado arrefecido a gás | advanced gas-cooled reactor |
| nucl.phys. | reactor avançado refrigerado a gás | advanced gas-cooled reactor |
| nucl.phys. | reactor com leito de esferas | pebble-bed reactor |
| gen. | reactor compacto transportável | package reactor |
| gen. | reactor compacto transportável | package power reactor |
| nucl.phys. | reactor de alta temperatura | high-temperature reactor |
| energ.ind., nucl.phys. | reactor de alta temperatura a tório | thorium high-temperature reactor |
| energ.ind., nucl.phys. | reactor de alta temperatura arrefecido a gás | high-temperature gas-cooled reactor |
| energ.ind., nucl.phys. | reactor de baixo fluxo | low-flux reactor |
| nucl.phys. | reactor de investigação | research reactor |
| therm.energ. | reactor de plasma | plasma reactor |
| tech. | reactor de potência | power reactor |
| energ.ind., nucl.phys. | reactor de tubos sob pressão | pressure tube reactor |
| energ.ind., nucl.phys. | reactor de água ebuliente | boiling-water reactor |
| nucl.phys. | reactor de água leve | light-water reactor |
| nucl.phys. | reactor de água natural | light-water reactor |
| nucl.phys. | reactor de água pesada | heavy-water reactor |
| energ.ind., nucl.phys. | reactor de água pesada arrefecido a gás | heavy-water gas-cooled reactor |
| energ.ind., nucl.phys. | reactor de água pesada fervente | boiling-heavy-water reactor |
| nucl.phys. | reactor de água pesada gerador de vapor | steam-generating heavy-water reactor |
| nucl.phys. | reactor de água pressurizada | pressurised-water reactor |
| gen. | reactor heterogéneo | heterogeneous reactor |
| transp. | reactor homogéneo | homogeneous reactor |
| energ.ind., nucl.phys. | reactor nuclear de potência | power reactor |
| energ.ind., nucl.phys. | reactor nuclear de potência | high-power reactor |
| gen. | reactor pré-fabricado | package reactor |
| gen. | reactor pré-fabricado | package power reactor |
| gen. | reactor químico de processamento | chemonuclear reactor |
| gen. | reactor químico de processamento | chemical processing reactor |
| gen. | reactor químico-nuclear | chemonuclear reactor |
| gen. | reactor químico-nuclear | chemical processing reactor |
| energ.ind. | reactor refrigerado a água | water-cooled reactor |
| nucl.phys. | reactor reprodutor a tório | thorium breeder reactor |
| nucl.phys. | reactor reprodutor rápido arrefecido a metal líquido | liquid-metal-cooled fast breeder reactor |
| nucl.phys. | reactor rápido comercial | commercial fast reactor |
| energ.ind., nucl.phys. | Reactor Rápido Prototípico | prototype fast reactor |
| energ.ind., nucl.phys. | reactor rápido protótipo | prototype fast reactor |
| environ. | reactores biológicos | bioreactor A container, such as a large fermentation chamber, for growing living organisms that are used in the industrial production of substances such as pharmaceuticals, antibodies, or vaccines |
| environ. | reactores nucleares | nuclear reactor |
| environ. | reactores nucleares | nuclear reactor Device which creates heat and energy by starting and controlling atomic fission |
| nucl.phys. | reactores nucleares de potência com neutrões térmicos | nuclear power reactors on thermal neutrons |
| environ. | reactores rápidos | fast reactor Nuclear reactor which produces more fissile material than it consumes, using fast-moving neutrons and making plutonium-239 from uranium-238, thereby increasing the reactor's efficiency |
| environ. | segurança dos reactores | reactor safety Those studies and activities that seek to minimise the risk of a nuclear reactor accident |
| transp., avia. | sopro dos reactores | jet blast |