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Reactivity  Coefficients  and  Reactivity  Defects
Reactivity Summary - h1019v2_47

Nuclear Physics and Reactor Theory Volume 2 of 2
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REACTIVITY DOE-HDBK-1019/2-93   Reactor Theory (Nuclear Parameters) Summary The important information in this chapter is summarized below. Reactivity Summary The number of neutrons  present in the core after a given number of generations  is calculated using Equation (3-4). Nn       No    keff n Reactivity 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        1 keff keff     1 1      r The relationship between units of reactivity are listed below. 1%       D k k 0.01    D k k 1  pcm      0.00001    D k k A reactivity coefficient is the amount of change in reactivity per unit change in the parameter.   A reactivity defect is  the total reactivity change caused by a change in the parameter.   The reactivity defect is the product of the reactivity coefficient and the magnitude of the parameter change. NP-03 Rev. 0 Page 22







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