| Term | Definition |
| control rod | A rod used in a nuclear reactor to absorb neutrons from fission reactions. |
| reactor core | lead housing for nuclear rods where fission takes place |
| fission | the reaction that releases nuclear energy when a nucleus breaks into 2 parts |
| radioactivity | emissions of radiation from the nucleus of an atom. |
| nuclear waste | radioactive waste material produced by nuclear power plants |
| turbine | set of a steam powered fan blades that spins a generator at a power plant |
| chain reaction | the splitting or fission of atomic nucleus causes the splitting of additional nuclei |
| contamination | the presence of unwanted or dangerous substances |
| nuclear fusion | a tremendous release of energy caused by atoms being forced to join; happens in the sun's core. |
| disposal | getting rid of something; the disposal of nuclear waste is a big problem |