the function of control rods in nuclear plants is to

Nuclear Power.The Moderator and Control Rods.. Fission causes a chain reaction 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.. Control rods are used to manage the power produced by the reactor. Cadmium or Boron rods the reaction rate can be reduced. Control rods are a way for the operators to adjust the nuclear reactor’s power. Some nuclear power plants use so called “grey control rods” for load following. Even though a nuclear reactor in a power plant has got peaceful intentions, the tremendous power, heat and energy which is associated with nuclear fission cannot be left on its own but needs to be controlled in a predictable manner. A control rod is a device that is used to absorb neutrons so that the nuclear chain reaction taking place within the reactor core can be slowed down or stopped completely by inserting the rods further, or accelerated by removing them slightly. Question is ⇒ The function of control rods in nuclear plants is to, Options are ⇒ (A) control temperature, (B) control radioactive pollution, (C) control absorption of neutron, (D) control fuel consumption, (E) none of the above., Leave your comments or Download question paper. Control rods are inserted into the core of a nuclear reactor and adjusted in order to control the rate of the nuclear chain reaction and, thereby, the thermal power output of the reactor, the rate of steam production, and the electrical power output of the power station. They do this by absorbing neutrons, making them unavailable for fission reactions. Function of control rods in nuclear power plant: The function of control rod is to control the chain reaction in reactor core by adjusting its height. Control rods are an important technology for maintaining the desired state of fission reactions within a nuclear reactor. If we take By absorbing neutrons, a control … Radioactivity. To prevent overheating, control rods made of a material that absorbs neutrons are inserted into the uranium bundle using a mechanism that can raise or lower them. The thing that actually starts any nuclear chain reaction is a spontaneous fission event that releases neutrons. In short, they are used to mantain a critical chain reaction of fission. A. control temperature B. control readioactive pollution C. control absorption of neutron D. control fuel consumption E. none of the above. So that it can continue or stop a reaction. The main examples of these rods are lead, cadmium, etc. Nuclear reactor control rods are designed with heavy mass elements. The function of control rods in nuclear plants is to__________________? All Rights Reserved. A. control temperature 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. Most commonly, Uranium U-… They are made of a material that will absorb the neutrons but not fission, e.g., cadmium, silver, hafnium, boron, etc. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Control Rods. The coolant system plays a pivotal role in performing this function. Ans: c. 58. When an operator wants the uranium core to produce more heat, the control rods are lifted out of the uranium bundle (thus absorbing fewer neutrons). The materials used for control rods must have very high absorption capacity for … Required fields are marked *. The control rod would have a tendency to absorb neutron which is What is a sample Christmas party welcome address? The control rods of nuclear power plants are the elements that allow regulating the power of the reactor. Answer : The main function of the control rods in a nuclear power plant is to absorb the unwanted extra neutrons emitted after the nuclear fission reaction, as to slow down or completely shut down the reaction in case of certain emergencies. 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. D. control fuel consumption Explanation: The function of control rod is to control the rate of nuclear reaction by absorption extra release neutrons. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL … Nuclear reactors use control rods (Figure \(\PageIndex{5}\)) to control the fission rate of the nuclear fuel by adjusting the number of slow neutrons present to keep the rate of the chain reaction at a safe level. How long will the footprints on the moon last? It is an essential element in reactor safety. That’s really not the case.A The function of control rods in nuclear plants is to (a) control temperature (b) control radioactive pollution (c) control absorption of neutron (d) control fuel consumption (e) none of the above. Page-11 section-1 Page-11 section-1 Learn Power Plant Engineering MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The other function of the fuel rods is to set up the geometry of a reactor. 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. Copyright © 2020 Multiply Media, LLC. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning. The moderator and control rods together So by inserting control rods such as Cadmium or Boron rods the reaction rate can be reduced. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. The control rod would have a tendency to absorb neutron which is the key for nuclear fission. The function of control rods in nuclear plants is to_____? They can respond very quickly to the grid requirements. This series of reactions can be made to occur inside an operating nuclear reactor by replacing some of the control rods with rods of U-238. So by inserting control rods such as Cadmium or Boron rods the reaction rate can be reduced. By absorbing the neutrons the control rods decrease the chain reaction. The control rods: normally made of Boron, these help control the fission reaction. 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 does contingent mean in real estate? C. control absorption of neutron Subcritical means that each reaction does not produce a sufficient amount of reactions for power generation. (b) To utilize the energy liberated in the form of kinetic energy. Your email address will not be published. The function of control rods in nuclear plants is to (a) control temperature (b) control readioactive pollution (c) control absorption of neutron (d) control fuel consumption (e) none of the above. B. control readioactive pollution But only if there is enough fissionable material nearby to set up a critical mass. * In some PWR reactors, special control rods are used to enable the core to sustain a low level of power efficiently. 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. Control rods are made of boron, cadmium, hafnium, or other elements that are able to absorb neutrons. Ans: c. 58. Control rods are tools which are used to control the chain reaction which occurs inside a nuclear reactor. Let's look at that. Biological Shield: The whole of the reactor is enclosed in a biological shield to prevent the escape or … The control rod would have a tendency to absorb neutron which is the key for nuclear fission. It would take about 20 such breeder reactors to produce enough fuel to operate one additional reactor. When did organ music become associated with baseball? the key for nuclear fission. To reduce heat, they are lowered into the uranium bundle. The rods can also be lowered completely int… What is the function of a control rod in a nuclear power plant? (adsbygoogle = window.adsbygoogle || []).push({}); PakMcqs.com is the Pakistani Top Mcqs website, where you can find Mcqs of all Subjects, You can also Submit Mcqs of your recent test and Take online Mcqs Quiz test. Most people believe that the concepts behind nuclear power plants are tremendously complex. Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. Without them, the reactor power would increase uncontrollably. In other words, every time an atom hits a neutron it splits and emits one or two more neutrons. What are some samples of opening remarks for a Christmas party? Who is the longest reigning WWE Champion of all time? Your email address will not be published. The nuclear reactions that take place inside a fission reactor happen in a chain. Chain reaction is controlled either by removing or inserting neutron absorbing materials. The main function of this is to soak up the neutrons. What are the release dates for The Wonder Pets - 2006 Save the Ladybug? Mcq Added by: Muhammad Bilal Khattak. What is the function of the control rods in the entire fission reactor proccess? CRDMs may either function off of an electric motor or hydraulically. Power Plant Engineering MCQ question is the important chapter for a Mechanical Engineering and GATE students. Control rods or blades These are made with neutron-absorbing material such as cadmium, hafnium or boron, and are inserted or withdrawn from the core to control the rate of reaction, or to halt it. Why don't libraries smell like bookstores? Raising and lowering the control rods allow operators to control the rate of the nuclear reaction. How many candles are on a Hanukkah menorah? off the rods the rate of reaction would increase. © Copyright 2016-2020 - www.PakMcqs.com/. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. As the nuclear decay process proceeds inside the reactor, it produces more fuel than it uses. If we take … IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. A coolant fluid enters the core at low temperature and exits at a higher temperature after collecting the fission energy. 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. E. none of the above. The energy released during a nuclear reaction in a power plant is directly used to _____. The nuclear fission chain reaction is the fundamental process by which nuclear reactors produce usable energy. So by inserting control rods such as The coolant: This is a liquid or gas that transfers energy from reactor to the heat exchanger. This then enables the Uranium … Control rods moderate the speed of the reaction, ensuring that it takes place in a way which is safe and sustainable. The use of breeder reactors would extend the fuel … 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. Nuclear Power Plants Nuclear Power Plants . They are long rods that the operator remotely inserts into the reactor. What is the function of a control rod in a nuclear power plant. Nuclear reactor - Nuclear reactor - Coolant system: The function of a power reactor installation is to extract as much heat of nuclear fission as possible and convert it to useful power, generally electricity. Left unchecked, the chain reaction can quickly spiral out of control, causing the reactor to explode. The neutrons initiate and build the chain (and are better at doing that if they slow down). These plants have the capability to make power maneuvering between 30% and 100% of rated power, with a slope up to 5% of rated power per minute. 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. In order to fulfill these requirements without introducing a large perturbation of the Material nearby to set up the geometry of a nuclear reactor ’ s power nuclear reactor rod to! 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