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A process in which some of the neutrons released in one fission event
cause other fissions to occur. There are three types of chain reactions: (1)
Nonsustaining chain reaction--An average of less than one fission is produced
by the neutrons released by each previous fission (reactor subcriticality).
(2) Sustaining chain reaction--An average of exactly one fission is produced
by the neutrons released by each previous fission (reactor criticality). (3)
Multiplying chain reaction--An average of more than one fission is produced by
the neutrons released by previous fission (reactor supercriticality).
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