| Subject | English | Basque |
| environ. | 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 | erreaktore laster |
| environ. | nuclear reactor Device which creates heat and energy by starting and controlling atomic fission | erreaktore nuklear |
| environ. | reactor safety Those studies and activities that seek to minimise the risk of a nuclear reactor accident | erreaktorearen segurtasun |