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Which risk arises when exceeding prompt criticality in fissile materials?

A)Uncontrolled chain reaction escalation
B)Moderator poisoning of the core
C)Fuel enrichment isotopic shift
D)Structural material neutron embrittlement

💡 Explanation

An uncontrolled chain reaction occurs because prompt criticality leads to a rapid increase in fission events, which causes exponential power increases rather than a stable fission rate. Therefore runaway fission occurs, rather than progressive contamination since it happens much faster.

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