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← ScienceWhich 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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