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← ScienceWhich constraint limits sustained efficient nuclear reactor operation?
A)Neutron moderation reduces chain reaction
B)Fission product neutron absorption increases✓
C)Fuel temperature decreases reactivity slowly
D)Coolant density lowers core heat transfer
💡 Explanation
Neutron absorption by accumulating fission products limits reactor operation because, over time, the *neutron poison effect* reduces the number of neutrons available to sustain fission; therefore, fuel becomes unusable rather than a moderating effect, which occurs in the moderator.
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