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Which risk increases when reactor coolant contains excess protium isotopes?

A)Reduced neutron moderation efficiency
B)Fuel rod surface oxidation rate
C)Increased delayed neutron fraction
D)Lower core thermal conductivity

💡 Explanation

Neutron moderation efficiency reduces because protium readily absorbs neutrons, lowering the probability of fission; therefore, the chain reaction sustains less effectively rather than fuel oxidation affecting stability under certain chemical conditions.

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