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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.
Best Answer: There are many types of chain reaction. Do you mean the one that goes on in a nuclear reactor? Nuclear reactors use a mixture of U235, which will under go nuclear chain reaction, and U238, which will not. The ratio of U235/U238 is much lower than you would see in a bomb. The ratio is (supposidly) just high enough to allow for a chain reaction to proceed slowly. A possible nuclear fission chain reaction is as follows: 1.