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← ScienceWhich consequence results when isotopic enrichment falters during reactor refueling?
A)Reduced neutron moderation efficiency occurs
B)Increased parasitic neutron absorption arises
C)Shielding effectiveness is immediately lessened
D)Criticality benchmark achievement becomes doubtful✓
💡 Explanation
If the fuel isn't sufficiently enriched during replacement, neutron population will not reach self-sustaining amplification. This is because exceeding the self-sustaining reaction threshold depends on proper isotopic ratios impacting neutron multiplication, rather than other parameters alone; therefore, criticality is unlikely.
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