Surrounded by thick pressure vessel that is filled with a cooling fluid. Is designed to contain the fission products in case of an accident. Metal fuel rods that contain solid uranium pellets are bombarded with neutrons. The chain reaction releases energy and produces more neutrons. The reactor core contains control rods that control the rate of fission in the reactor. They do this by absorbing neutrons, which prevents the neutrons from causing fission reactions in the uranium fuel. The heat released during the nuclear reactions is used to generate electricity in the same way that power plants burn fossil fuels. Energy released from the fission reaction heats a closed loop of water that heats another body of water. As the water boils, it produces steam that drives a steam turbine, which is used to generate electricity. Do not produce greenhouse gases.