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Which behavior occurs when operating nuclear fuel rods near voiding?

A)Increased neutron moderation efficacy appears
B)Reduced coolant thermal transfer efficiency
C)Greater delayed neutron production happens
D)Decreased control rod maneuverability arises

💡 Explanation

Reduced coolant flow causes vapor voids; the mechanism is departure from nucleate boiling (DNB). Fuel rod temperatures increase drastically, leading to reduced thermal transfer; rather than neutron changes, it’s a thermal failure, because lower heat extraction directly increases fuel temperature, therefore cladding damage happens quickly.

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