Control Rod Worth

Control rods play a central role in reactivity control for various types of reactors; they are used in the reactivity control for the power level changes, the reactivity compensation for the long-term fuel burnup, and the reactor scram in an emergency. Boron is generally used as a neutron absorber for control rods using the (n, a) reaction of the isotope 10B.

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image060Fig. 1.9 Boric acid concentration changes of chemical shim (PWR) [4]