Reactor Theory (Nuclear Parameters)DOE-HDBK-1019/2-93REACTIVITY COEFFICIENTSREACTIVITY COEFFICIENTSChanges in the physical properties of the materials in the reactor will result inchanges in the reactivity. Reactivity coefficients are useful in quantifying thereactivity change that will occur due to the change in a physical property such asthe temperature of the moderator or fuel.EO 2.1EXPLAIN the conditions of over moderation and undermoderation.EO 2.2EXPLAIN why many reactors are designed to be operated inan under moderated condition.EO 2.3STATE the effect that a change in moderator temperature willhave on the moderator to fuel ratio.EO 2.4DEFINE the temperature coefficient of reactivity.EO 2.5EXPLAIN why a negative temperature coefficient of reactivityis desirable.EO 2.6EXPLAIN why the fuel temperature coefficient is moreeffective than the moderator temperature coefficient interminating a rapid power rise.EO 2.7EXPLAIN the concept of Doppler broadening of resonanceabsorption peaks.EO 2.8LIST two nuclides that are present in some types of reactorfuel assemblies that have significant resonance absorptionpeaks.EO 2.9DEFINE the pressure coefficient of reactivity.EO 2.10EXPLAIN why the pressure coefficient of reactivity is usuallynegligible in a reactor cooled and moderated by a subcooledliquid.EO 2.11DEFINE the void coefficient of reactivity.EO 2.12IDENTIFY the moderator conditions under which the voidcoefficient of reactivity becomes significant.Rev. 0NP-03Page 23
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