| BWR | Boiling Water Reactor |
| Boiling Water Reactor | A nuclear reactor which uses steam to transfer heat energy. |
| CANDU | A Canadian designed pressurized heavy water reactor which uses unenriched Uranium as fuel. |
| FBR | Fast Breeder Reactor |
| Fast Breeder Reactor | A fast reactor which is designed to produce more fuel than it consumes. |
| Fast Reactors | Nuclear reactors which use fast neutrons from highly enriched fuel. |
| Heavy Water Reactor | D2O, water with Dueterium atoms in place of hydrogen atoms. Heavy water does not absorb neutrons, making it more useful for reactors using unenriched Uranium. |
| Heavy Water | A nuclear reactor which uses heavy water as a moderator and heat transfer agent |
| LWR | Light Water Reactor |
| Light Water Reactor | A nuclear reactor which uses light water as a moderator and heat transfer agent. |
| Light Water | H2O, normal water |
| Moderator | A material which is used to slow down emitted electrons for the purpose of increasing the fission reaction rate to create a sustainable chin reaction. Moderators include: Light water, heavy water, and graphite. |
| NPT | The Nuclear Non-Proliferation Treaty |
| PBMR | Pebble Bed Modular Reactor |
| PWR | Pressurized Water Reactor |
| Pebble Bed Reactor | A nuclear reactor which uses a semi or fully inert gas as a heat transfer agent. These gases include helium, nitrogen, and carbon dioxide. |
| Pressurized Water Reactor | A nuclear reactor which uses superheated water to transfer heat energy. |
| Pu-239 | An isotope of Plutonium with 239 protons. |
| RBMK | A Russian designed slow reactor which uses graphite as a moderator and light water as heat transfer agent. |
| Slow Reactors | Nuclear reactors which use moderators to slow neutrons to increase fissioning of U-235. |
| U-235 | An isotope of Uranium with 235 protons. |
| U-238 | An isotope of Uranium with 238 protons. |
| Unenriched Uranium | Natural Uranium, 0.7% U-235. |
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