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Which outcome increases when a reactor coolant's moderator efficiency declines?

A)Neutron absorption becomes less effective
B)Delayed neutron fraction reaches zero
C)Coolant volumetric flow constant rises
D)The critical reaction threshold decreases

💡 Explanation

Neutron absorption decreases because neutron moderation relies on collisions that slow neutrons. The moderator's reduced efficiency causes less neutron slowdown, therefore absorption declines rather than other effects because the collision rate decreases.

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