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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.
The nuclear fission chain reaction is the fundamental process by which nuclear reactors produce usable energy. Most commonly, Uranium U-235 is the fissionable material used in this chain reaction (as shown in Fig. 1), although the basic outline is applicable generally.