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Which risk increases when spent nuclear fuel undergoes radioactive decay?

A)Fuel rod structural embrittlement
B)Elevated cladding oxidation rates
C)Sustained high thermal output
D)Reduced neutron moderation capacity

💡 Explanation

Increased risk of high thermal output results from exothermic radioactive decay; spontaneous nuclear transformations release energy as heat. Therefore, spent fuel temperature increases rather than decreasing solely due to reduced fission, because alpha and beta decay continues post-operation.

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