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The moderator in a nuclear reactor slows (moderates) the neutrons that are released during fission, so that they can subsequently cause fission in other atoms. When the neutrons are initially released, they tend to have too much energy, which impacts their ability to cause subsequent fission.

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Nuclear power plants can produce energy more cheaply and with less pollution them plants that use fossil fuels why are there not more nuclear power plants dad plants that burn fossil fuels?

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