Abstract

Changes in power reactor temperature or pressure cause reactivity changes. The causes for these reactivity changes are the temperature dependence of nuclear properties, changes in the quantity of material present in the reactor core because of density changes or changes in the dimensions or shape of core components. Evaluating the feedback reactivity involves the use of feedback coefficients (change in reactivity per unit change in a process variable). Feedback reactivity effects are very important in achieving suitable reactor performance.

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