What is the primary function of a nuclear reactor?

The primary function of a nuclear reactor is to generate heat for steam production. In a nuclear reactor, nuclear fission occurs when uranium or other fissile material is split into smaller atoms, releasing a significant amount of energy in the form of heat. This heat is then used to convert water into steam. The steam drives turbines connected to generators, ultimately producing electricity.

Production of electricity from solar energy, enrichment of uranium, and storage of radioactive waste are processes associated with different technologies or stages of the nuclear energy lifecycle but are not the core function of a nuclear reactor itself. The nuclear reactor's main role is specifically focused on generating the heat necessary for the steam production integral to the electricity generation process.