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Which risk increases when molten salt fast reactors encounter significant overheating?

A)Spontaneous criticality accidents are more likely
B)Delayed neutron fraction approaches zero
C)Tritium permeation increases dramatically
D)Graphite moderator turns into diamond structure

💡 Explanation

Hot fuel causes thermal expansion, decreasing density. This leads to fewer fissions, but because the fuel enrichment must be higher than conventional reactors, there's runaway positive feedback from decreased neutron absorption probability: therefore, spontaneous criticality accidents become more likely, rather than mitigated temperature effects.

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