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Which outcome occurs when heavy isotopes accumulate within a nuclear reactor's moderator?

A)Decreased neutron moderation efficiency occurs
B)Increased delayed neutron fraction occurs
C)Fuel rod cladding oxidization increases
D)Control rod performance unexpectedly improves

💡 Explanation

Neutron absorption increases due to the accumulated heavy isotopes within the moderator region of the reactor core that undergo neutron capture; therefore, neutron moderation efficiency decreases because heavier isotopes absorb neutrons, rather than slowing them down to sustain fission.

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