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In most nuclear reactors control rods are used, which contain some material that absorbs neutrons, like boron. These can be finely adjusted to keep the reactor just critical, or dropped in to shutdown quickly if necessary.

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What is the meaning of nuclear reactor?

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How is a nuclear fission reaction controlled in a nuclear reaction?

Reactions that involve nuclei, called nuclear reactions, result in a tremendous amount of energy. Two types are fission and fusion.


How is a nuclear fission reaction controlled in nuclear reactor?

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