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Which outcome occurs when high neutron flux activates control rod isotopes?

A)Neutron absorption decreases chain reaction
B)Fuel enrichment increases localized criticality
C)Gamma radiation induces structural failure
D)Thermal expansion prevents coolant circulation

💡 Explanation

Neutron absorption in control rod poisons involves induced radioactivity, capturing neutrons, because the transmutation increases the absorption cross-section. Therefore, neutron flux drops; rather than core overheating resulting from positive reactivity, control rod isotopes mitigate runaway criticality.

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