increase the temperature of the water.E. Control rods are rods, plates, or tubes containing a neutron absorbing material (material with high absorption cross-section for thermal neutron) such as boron, hafnium, cadmium, etc., used to control the power of a nuclear reactor. How Does a Nuclear Reactor Work? Nuclear Power.The Moderator and Control Rods.. Fission causes a chain reaction in the core of a nuclear reactor.. absorb neutrons.C. Control rods moderate the speed of the reaction, ensuring that it takes place in a way which is safe and ⦠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. ). The nuclear reactor working principle is nuclear fission and it is one kind of method used for splitting the atoms to generate electricity. 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). Control rods The steering tools of the fission rate in reactors. There are limits to the length of time that control rods can be used in an operating reactor. The control of the chain reaction rate is achieved by varying the amount of neutrons absorbers in the core of a nuclear reactor. What control rods are for. 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. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing ⦠Control rods usually constitute cluster control rod assemblies and are inserted into guide ⦠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. The main function of the nuclear reactor is to control nuclear fission. A control rod is a component in a nuclear reactor which can absorb neutrons. 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.. Reactor Theory (Nuclear Parameters) DOE-HDBK-1019/2-93 CONTROL RODS The material used for the control rods varies depending on reactor design. Exact assessment of the drop time is greatly dependent on the forces acting on the control rod⦠Control rods are tools which are used to control the chain reaction which occurs inside a nuclear reactor. Control rods in a nuclear reactor are used to:A. move fuel rods around in the chamber.B. The moderator and control rods ⦠Left unchecked, the chain reaction can quickly spiral out of control, causing the reactor to explode. If you need to shut down the reactor (becaue of some emergency) other means are sometimes employed --- but these specific details of these vary. provide neutrons to ⦠Control rods are used in nuclear reactors to control the fision rate of uranium and plutonium. Last thing: control rods are designed to control the reactor and keep it in steady state (that is a proper chain reaction). provide cooling by decreasing the temperature of the water.D. Nuclear reactors use uranium that will process into tiny ceramic pellets & stacked jointly into fuel rods. 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