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Which risk increases when a thorium-232 fuel rod within a molten salt reactor experiences sustained overheating?

A)Delayed neutron precursor concentration decreases
B)Iodine-135 concentration drops exponentially
C)Xenon-135 buildup reaches criticality faster
D)Decay heat load becomes non-negligible

💡 Explanation

Decay heat increases because sustained overheating elevates the fuel's temperature, thereby interfering with heat removal; therefore, increased decay heat load is the consequence rather than criticality or nuclide concentration changes related to reactor control.

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