Reactor Theory (Nuclear Parameters)DOE-HDBK-1019/2-93CONTROL RODSRodControlMechanismsThe control rod insertion rates on a scram are designed to be sufficient to protect the reactoragainst damage in all transients that are expected to occur during the life of the reactor.During normal rod motion, the control rods must be able to move rapidly enough to compensateforthemostrapidrateatwhichpositivereactivityisexpectedtobuildwithinthereactorinorder to provide positive control. The transient that is normally considered when setting thisminimum rod speed is the burnout of maximum peak xenon while at full power. Xenon burnoutis usually the most rapid, non-accident transient expected. The maximum rod speed is normallylimited in order to reduce the severity of an accident involving the continuous withdrawal ofcontrol rods.SummaryThe important information in this chapter is summarized on the following page.Rev. 0NP-03Page 57
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