Water Nuclear Reactor The typical pressurized water nuclear reactor has a core of fissionable material in which the chain reaction takes place. The energy that is released during the fission process heats the water. The chain reactions are controlled by rods inserted into the core that absorbs the neutrons. The water moderates the neutrons by slowing them down during fission which changes the fission neutrons' energy from kinetic energy to thermal energy. The thermal energy is then removed from the core by the water to an external thermal-energy converter. In the external water reactor the thermal energy produces steam for the turbine to drive the generator which produces electricity. The energy contained from the water nuclear reactors is mostly used to power ships.
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