Control rods are used to manage the power produced by the reactor. They are made of a material that will absorb the neutrons but not fission, e.g., cadmium, silver, hafnium, boron, etc. off the rods the rate of reaction would increase. energize control rods heat water create electric current fuse hydrogen into helium please help astronomy The luminosity of the Sun is 4*10^33 erg/s, and its radius is 7*10^10 cm. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Control Rods. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL … B. control readioactive pollution If we take … © Copyright 2016-2020 - www.PakMcqs.com/. The use of breeder reactors would extend the fuel … By absorbing neutrons, a control … Left unchecked, the chain reaction can quickly spiral out of control, causing the reactor to explode. A coolant fluid enters the core at low temperature and exits at a higher temperature after collecting the fission energy. Some nuclear power plants use so called “grey control rods” for load following. Copyright © 2020 Multiply Media, LLC. The neutrons initiate and build the chain (and are better at doing that if they slow down). So by inserting control rods such as Cadmium or Boron rods the reaction rate can be reduced. E. none of the above. What is the function of a control rod in a nuclear power plant. It is an essential element in reactor safety. Raising and lowering the control rods allow operators to control the rate of the nuclear reaction. What is a sample Christmas party welcome address? They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning. Your email address will not be published. Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. Design of control rod drive mechanisms Control rods may be inserted either via the top of the reactor vessel through the flange or in through the bottom of the vessel such as in boiling water reactors. Nuclear Power.The Moderator and Control Rods.. Fission causes a chain reaction in the core of a nuclear reactor.. What is the function of the control rods in the entire fission reactor proccess? They constitute a real-time control of the fission process, which is crucial for both keeping the fission chain reaction active and preventing it from accelerating beyond control. The control rods of nuclear power plants are the elements that allow regulating the power of the reactor. Control rods are rods, plates, or tubes containing a neutron absorbing material (material with high absorbtion cross-section for thermal neutron) such as boron, hafnium, cadmium, etc., used to control the power of a nuclear reactor. All Rights Reserved. CRDMs may either function off of an electric motor or hydraulically. The function of the control rods in a nuclear reactor is to: A) increase fission by slowing down the neutrons B) decrease the energy of the neutrons without absorbing them C) increase the ability of the neutrons to cause fission D) decrease fission by absorbing neutrons E) provide the critical mass for the fission reaction Ans: D Difficulty: E Section: 43-4 18. What are the release dates for The Wonder Pets - 2006 Save the Ladybug? C. control absorption of neutron The nuclear fission chain reaction is the fundamental process by which nuclear reactors produce usable energy. The functions of nuclear reactors are as follows: (a) To provide neutrons with enough energy so that the same may be absorbed by the nuclei of certain heavy atoms causing fission so that a large amount of energy is liberated. Control rods are an important technology for maintaining the desired state of fission reactions within a nuclear reactor. What is the function of a control rod in a nuclear power plant? They are long rods that the operator remotely inserts into the reactor. * In some PWR reactors, special control rods are used to enable the core to sustain a low level of power efficiently. Control rods are made of boron, cadmium, hafnium, or other elements that are able to absorb neutrons. What does contingent mean in real estate? Why don't libraries smell like bookstores? Nuclear Power Plants Nuclear Power Plants . Nuclear fission is a source of tremendous energy which could be either used for destructive purposes such as nuclear weapons or constructive purposes such as a nuclear reactor for producing electrical energy. The control rod would have a tendency to absorb neutron which is the key for nuclear fission. Radioactivity. Fuel rods provide fissionable elements such as uranium - 235, The uranium abosrbs a neutron at thermal speeds (energy transefered to the moderator) from previous reactions. 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