A '''nuclear reactor''' uses the [[heat]] of sustained [[nuclear fission]] to generate [[electricity]] or move a ship. Some nuclear reactors, known as [[breeder reactor]]s, can produce additional [[fuel]] even as they consume fuel. | A '''nuclear reactor''' uses the [[heat]] of sustained [[nuclear fission]] to generate [[electricity]] or move a ship. Some nuclear reactors, known as [[breeder reactor]]s, can produce additional [[fuel]] even as they consume fuel. |