Nuclear power reactors are characterized by the existence of high radiation. Fields and by the requirement that some materials possess certain properties with respect to neutron absorption. The radiation fields have a profound effect.on the properties of many materials which, by design, must fulfill specific neutronic, structural and transport functions. Although all nuclear reactor. materials must meet the specifications of strength and reliability, we will concern ourselves in this chapter primarily with those material aspects which are affected by various radiations and particles associated with nuclear fission and with those materials which fulfill a particular neutronic function.
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