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Which risk increases when control rods fail during cooling?

A)Elevated decay heat production
B)Reduced fission product leakage
C)Increased moderator reactivity
D)Decreased xenon-135 buildup

💡 Explanation

Elevated decay heat production can be caused as spent fuel elements spontaneously fission due to increased neutron flux. Insufficient neutron absorption is the mechanism, because cooling limitations diminish binding energy of neutrons; therefore decay heat is higher rather than moderator reactivity effects influencing other reactions.

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