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There are two types of nuclear reactors. The Pressurized Water Reactor (PWR) and The Boiling Water Reactor (BWR). Pressurized Water Reactors keep water under pressure so that it heats but does not boil. Water from the reactor and the water that is turned into steam are in separate pipes and never mix. In Boiling Water Reactor's, the water heated by fission actually boils and turns into steam to turn the generator. In both types of plants, the steam is turned back into water and can be used again in the process. This animation is an example of a Pressurized Water Reactor.