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reactor  (reactors plural )A reactor is the same as a  nuclear reactor.  n-count 


fast-breeder reactor   (fast-breeder reactors plural )A fast-breeder reactor or a fast-breeder is a kind of nuclear reactor that produces more plutonium than it uses.  n-count 
nuclear reactor   (nuclear reactors plural )A nuclear reactor is a machine which is used to produce nuclear energy or the place where this machine and other related machinery and equipment is kept.  n-count 
They shut down the nuclear reactor for safety reasons.