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Control Rods. The nuclear chain reaction may be controlled using a device called a control rod. Control rods are made of materials which absorb neutrons. Thus, when a control rod is inserted into a nuclear reactor it reduces the number of free neutrons available to cause the uranium atoms to fission.
Hence we see that control rods tend to provide a mechanism wherein the immense nuclear energy can be tamed within reasonable limits and ensure safety and security of the reactor as well the outside environment. slide 4 of 4. Read More About Nuclear Power Plants Components of Nuclear Power Plant: Fuel.