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← ScienceWhich outcome causes increased neutron flux instability during nuclear reactor operation?
A)Xenon-135 neutron absorption (iodine pit)✓
B)Increased control rod thermal expansion
C)Moderator temperature coefficient shift
D)Cladding material embrittlement propagation
💡 Explanation
Xenon-135 buildup after reactor shutdown causes increased neutron absorption (iodine pit), poisoning reactions. This occurs because the rapid fission stops, and Iodine-135 decays into Xenon-135; therefore negative reactivity increases rather than decreases, impacting flux distribution.
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