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← ScienceWhich risk increases when a thorium-232 rod intended for use in a molten salt reactor accumulates an excess of protactinium-233?
A)Increased risk of structural cavitation
B)Increased probability of neutron absorption✓
C)Increased rate of spontaneous boiling
D)Increased fuel salt reactivity swing
💡 Explanation
The risk of parasitic neutron absorption rises because protactinium-233 has a significant neutron capture cross-section. This mechanism reduces the number of neutrons available for breeding uranium-233, therefore decreasing the efficiency, rather than enhancing fuel boiling or cavitation.
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