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Which consequence results when isotopic composition shifts severely in reactor fuel?

A)Moderator-coolant boiling occurs aggressively
B)Neutron flux asymmetries induce instability
C)Control rod effectiveness improves sharply
D)Delayed neutron fraction increases greatly

💡 Explanation

Neutron flux asymmetries induce instability because changing fuel isotopes alter neutron absorption cross-sections via neutron poisoning. Therefore, the spatial distribution of fission events changes with an uneven burnup, rather than moderator boiling which depends more on heat transfer conditions.

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