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← ScienceWhich outcome accelerates within uranium fuel rods experiencing neutron over-moderation?
A)Fission product transmutation decreases reactivity
B)Delayed neutron fraction increases feedback
C)Iodine poisoning reduces keff sharply✓
D)Radioactive decay generates more neutrons
💡 Explanation
Iodine-135 produced during fission decays to Xenon-135, a powerful neutron absorber via neutron capture. Because higher neutron flux promotes xenon production via the Iodine decay chain, leading to increased neutron absorption by the Xenon-135 product, therefore the rods become ‘poisoned’ rather than continuing fission.
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