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How is chain reaction controlled in a nuclear power plant? Chain reaction is controlled through using neutron absorbing materials as reactor control rods (of high neutron absorbing material), boron, and/or cadmium.
Nuclear fission (division) of certain large unstable atomic nuclei results in usable energy. Nuclear fission also occurs in a nuclear bomb, but for nuclear energy the fission process is controlled and takes place in a nuclear fission reactor (Cattenom is pictured). There are various types of nuclear fission reactors. See references for details.