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← ScienceWhich outcome occurs when a pressurized water reactor’s moderator density decreases greatly?
A)Increase in neutron mean free path✓
B)Increased rate of nuclear fission
C)Higher core heat transfer rate
D)Control rod ejection acceleration
💡 Explanation
A decrease in moderator density reduces neutron moderation, causing their average speed to increase via moderation; therefore, the neutron mean free path increases because neutrons interacts less with the moderator, rather than increasing reactor power.
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