What must nuclear reactors produce in order to generate energy? (Site 1)

They must generate heat to produce steam.

Nuclear reactors must produce a lot of heat to generate energy.

Explanation:

Nuclear reactors use a lot of heat generated from the fission of uranium. This heat is then used to move a turbine or a generator that produced electricity. The production of electricity using nuclear reactors is free from any types of emissions. When electricity is generated in a nuclear reactor, no polluting or greenhouse gases are emitted which in turn benefits the environment.