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← ScienceWhich risk increases when U-235 isotopic enrichment exceeds limits?
A)Accelerated moderator neutron absorption
B)Uncontrolled nuclear chain reaction✓
C)Spontaneous control rod ejection
D)Primary coolant pump cavitation
💡 Explanation
An uncontrolled nuclear chain reaction risk rises because a higher U-235 concentration boosts neutron production via nuclear fission. This positive feedback causes exponential power increase, therefore reactor overheating, rather than moderator absorption due to increased neutron flux.
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