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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.
Fission splits the atom into smaller nuclei and releases radiation, free neutrons, and heat. Some of those free neutrons are then absorbed by other atoms, creating a chain reaction. At todayâs nuclear power plants, these chain reactions are controlled inside of a nuclear reactor that is surrounded by water.