Reactor Theory (Reactor Operations)DOE-HDBK-1019/2-93SUBCRITICAL MULTIPLICATIONSummaryThe important information in this chapter is summarized below.Subcritical Multiplication SummarySubcritical multiplication is the effect of fissions in the fuel increasing the effective source strength of a reactor with a keff less than one.Subcritical multiplication factor is the factor that relates the source level to thesteady-state neutron level of the core.The steady-state neutron level of a subcritical reactor can be calculated based onthe source strength and keff using Equation (4-3).N S11 keffThe count rate expected in a subcritical reactor following a change in reactivitycan be calculated based on the initial count rate, initial keff, and amount ofreactivity addition using Equation (4-4).CR1CR21 k21 k11/M plots can be used to predict the point of criticality.Rev. 0NP-04Page 9
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