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Which outcome occurs when neutron moderation degrades inside a CANDU reactor core?

A)Chain reaction criticality increases rapidly
B)Xenon-135 neutron absorption declines fastest
C)Tritium production slows exponentially downwards
D)Plutonium-239 breeding efficiency rises higher

💡 Explanation

If neutron moderation is reduced (due to coolant loss, for example), the **neutron flux** needed to sustain fission increases because fewer neutrons are slowed, therefore criticality increases toward exceeding maximum permitted safety limits, rather than the absorption rates changing.

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