The function of a moderator in a nuclear power reactor is to slow down the neutrons to allow them to be absorbed by other nuclei.

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The moderator in a nuclear power reactor is typically made of a substance that can slow down fast-moving neutrons, such as water or graphite. The slowing down of these neutrons increases their likelihood of being absorbed by other nuclei, which is a necessary process for the sustained chain reaction that powers the reactor.

The Function of a Moderator in a Nuclear Power Reactor