ReactorSystem used to initiate, maintain and control a fission chai... in which the fissionSee 'nuclear fission'. chain reactionSelf-perpetuating reaction. In a fission chain reaction, a f... is maintained mainly by fast neutrons. Fast reactors have no moderatorMaterial used to "decelerate" fast neutrons to low energies,... since deceleration of the fast fissionSee 'nuclear fission'. neutrons generated during the fissionSee 'nuclear fission'. must be avoided.
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