There are two major types of water-cooled reactors namely light water reactors (which use normal water) and heavy water reactors (which use a chemically distinct type of water).
Nuclear reactor is any of a class of devices that can initiate and control a self sustaining series of nuclear fissions.
Nuclear reactors are used as research tools, as systems for producing radioactive isotopes, and most prominently as energy sources for nuclear power plants.
There are three major reactor design families under the umbrella of water cooled reactors currently in use such as :
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