Reactor Theory (Reactor Operations)DOE-HDBK-1019/2-93REACTOR OPERATIONREACTOR OPERATIONIt is important to understand the principles that determine how a reactor respondsduring all modes of operation. Special measures must be taken during the startupof a reactor to ensure that expected responses are occurring. During poweroperation, control of the flux shape is necessary to ensure operation within limitsand maximum core performance. Even when a reactor is shut down, the fact thatthe fission products created by the fission process continue to generate heatresults in a need to monitor support systems to ensure adequate cooling of thecore.EO 3.1EXPLAIN why a startup neutron source may be required fora reactor.EO 3.2LIST four variables typically involved in a reactivity balance.EO 3.3EXPLAIN how a reactivity balance may be used to predict theconditions under which the reactor will become critical.EO 3.4LIST three methods used to shape or flatten the core powerdistribution.EO 3.5DESCRIBE the concept of power tilt.EO 3.6DEFINE the term shutdown margin.EO 3.7EXPLAIN the rationale behind the one stuck rod criterion.EO 3.8IDENTIFY five changes that will occur during and after areactor shutdown that will affect the reactivity of the core.EO 3.9EXPLAIN why decay heat is present following reactoroperation.EO 3.10LIST three variables that will affect the amount of decay heatpresent following reactor shutdown.EO 3.11ESTIMATE the approximate amount of decay heat that willexist one hour after a shutdown from steady state conditions.Rev. 0NP-04Page 23
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