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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 occurs when the nucleus of a heavy atom captures a neutron (induced fission), or it can occur spontaneously due to the instability of the isotope (spontaneous fission). Nuclear chain reactions. The nuclear chain reaction is the process of releasing neutrons in a first nuclear fission and, then, produce an additional fission in at least one more core. This nucleus also produces neutrons, and the process continues. These chain reactions can be controlled or uncontrolled.