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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.
An atom gets split, kicking out a few more neutrons, which split other atoms, which release more neutrons, and then you have a chain reaction. Nuclear reactors also have control rods, which you stick down into the fuel to absorb neutrons, to slow the reaction down, or withdraw to speed the reaction up. But that's the part that's never made any sense to me.