Control rods are used in nuclear reactors to control the fision rate of uranium and plutonium. Radioactivity. ). Left unchecked, the chain reaction can quickly spiral out of control, causing the reactor to explode. The nuclear reactor working principle is nuclear fission and it is one kind of method used for splitting the atoms to generate electricity. Control rods move in and out of the reactor, water is constantly pumped through to keep the whole thing cool and the power plant produces energy. A control rod is a component in a nuclear reactor which can absorb neutrons. Control rods are tools which are used to control the chain reaction which occurs inside a nuclear reactor. First there is the objective of safety and to avoid an accident through the divergence of the chain reaction. The name of this component is given as such because its major role is to control the fission rate of uranium or plutonium used in the nuclear reactor by absorbing neutrons. Exact assessment of the drop time is greatly dependent on the forces acting on the control rod… The moderator and control rods … Nuclear reactors use uranium that will process into tiny ceramic pellets & stacked jointly into fuel rods. The main function of the nuclear reactor is to control nuclear fission. Control rods usually constitute cluster control rod assemblies and are inserted into guide … absorb neutrons.C. The ability of a control rod … Control rods in a nuclear reactor are used to:A. move fuel rods around in the chamber.B. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing … Generally, the material selected should have a good absorption cross section for neutrons and have a long lifetime as an absorber (not burn out rapidly). The composition of control rods usually includes chemical … The control of the chain reaction rate is achieved by varying the amount of neutrons absorbers in the core of a nuclear reactor. The speed of the chain reaction must be controlled because the ever increasing numbers of splitting nuclei will very quickly release a large amount of heat energy and this would cause the nuclear reactor to explode.. The drop time of the control rod plays an important role in judging whether a nuclear reactor can be safely shut down in an emergency condition and has become one of the most important parameters for the safety analysis of nuclear power plants. How Does a Nuclear Reactor Work? Last thing: control rods are designed to control the reactor and keep it in steady state (that is a proper chain reaction). Nuclear Power.The Moderator and Control Rods.. Fission causes a chain reaction in the core of a nuclear reactor.. provide cooling by decreasing the temperature of the water.D. provide neutrons to … Control rods moderate the speed of the reaction, ensuring that it takes place in a way which is safe and … What control rods are for. 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