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← ScienceWhich risk arises, when a CANDU reactor lacks coolant regulation?
A)Core geometry becomes unstable
B)Neutron moderation decreases drastically
C)Xenon-135 poisoning accelerates rapidly✓
D)Enriched uranium fuel starts melting
💡 Explanation
Uncontrolled coolant temperature changes redistribute Xenon-135 unevenly, initiating localized power spikes, causing a reactor stop due to neutron absorption via Xenon poisoning. This is a positive feedback mechanism, therefore it does not cause geometric instability, rather than meltdown.
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