REACTIVITYDOE-HDBK-1019/2-93 Reactor Theory (Nuclear Parameters)SummaryThe important information in this chapter is summarized below.Reactivity SummaryThe number of neutrons present in the core after a given number of generations iscalculated using Equation (3-4).Nn No keffnReactivity is the fractional change in neutron population per generation.Reactivity and keff are represented in Equation (3-5) and Equation (3-6),respectively.r keff 1keffkeff 11 rThe relationship between units of reactivity are listed below.1%D kk0.01D kk1 pcm 0.00001D kkA reactivity coefficient is the amount of change in reactivity per unit change in theparameter. A reactivity defect is the total reactivity change caused by a change inthe parameter. The reactivity defect is the product of the reactivity coefficient andthe magnitude of the parameter change.NP-03Rev. 0Page 22
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