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← ScienceWhich risk increases during control rod ejection in a pressurized water reactor?
A)Prompt criticality power excursion✓
B)Delayed neutron induced instability
C)Increased fuel pin clad oxidation
D)Reduced moderator temperature coefficient
💡 Explanation
Prompt criticality risk increases because positive reactivity is rapidly inserted, overwhelming control mechanisms. This induces a rapid, uncontrolled chain reaction leading the fission rate increasing dramatically thus causing prompt criticality rather than delayed neutron effects which are too slow to compensate.
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