b) Graphite, air. The nuclear power plant at Tarapur has the following reactor (a) fast breeder (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. The nuclear power plant at Tarapur has the following reactor (a) fast breeder (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. Research reactors have very simple heat-removal systems, as their primary purpose is to perform research and not generate power. Progress made in the development of the Experimental Beryllium Oxide Reactor (EBOR) is reported. As a result, higher plant efficiency (40% or more) could be obtained compared to the water cooled design (33-34%). d) Unity . Gas cooled reactors: carbon dioxide (CO2)/ Helium These are the coolants used in respective reactors. Amongst the following, the fissionable materials are . motivated the development of the high-temperature gas-cooled reactor (HTGR) with its characteristic reactor core of graphite moderator and ceramic fuel, and its use of the inert helium gas as coolant. Its use is limited to the United Kingdom; it is sometimes known as the Magnox reactor. HTGR uses TRISO coated particle fuel, full ceramic core structure, and helium as coolant. Water and steam are a common fluid used for heat exchange in the primary circuit (from surface of fuel rods to the coolant flow) and in the secondary circuit. These nuclear plants will be established at. Light Water Graphite Reactors Ans: a. In nuclear fission each neutron that causes fission releases, Q8. Q8. ⇒ Gas cooled reactor uses following materials as moderator, and coolant graphite, C02 graphite, air heavy water, C02 lead, H2 ⇒ A nuclear unit becoming critical means it is generating power to rated capacity it is capable of generating much more than rated capacity there is danger of nuclear spread Boiling water reactor uses the following as moderator, coolant and working fluid (a) ordinary fluid (b) heavy water (c) molten lead (d) hydrogen gas (e) none of the above. In the second part of the paper, we provide an … These reactors use C02 like the coolant & graphite like the moderator. motivated the development of the high-temperature gas-cooled reactor (HTGR) with its characteristic reactor core of graphite moderator and ceramic fuel, and its use of the inert helium gas as coolant. Gas cooled reactor uses fol... general knowledge. Its use is limited to the United Kingdom; it is sometimes known as the Magnox reactor. HTGR uses TRISO coated particle fuel, full ceramic core structure, and helium as coolant. graphite, C02; graphite, air; heavy water, C02; During this period, the GCFR concept was found to be more challenging than liquid-metal-cooled reactors, and none were ever constructed. It doesn’t have a moderator. the following reactor (a) fast breeder (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. Gas cooling, in a closed cycle at high pressure, permits high-temperature operation and consequently high thermal efficiency. a) Same. Objective Questions and Answer: Thermal Engineering 18, Part 18: Objective questions and answers of Thermal Engineering. Gas cooled reactor uses following materials as moderator, and coolant_____? Boiling water reactor uses the following as moderator, coolant and working fluid (a) ordinary fluid (b) heavy water (c) molten lead (d) hydrogen gas (e) none of the above. In the Gas Cooled Reactor (GCR), the moderator is graphite. Ans: c . after which it is cooled, recompressed, reheated and returned to the reactor vessel. These are the second generation of British gas-cooled reactors, using graphite as the neutron moderator and carbon dioxide as coolant. Their usage is subject to reactor design and energy of neutrons populated in the nuclear reactor. The first nuclear power plant in India is located at, Q15. Q10. The moderators vary in terms of their moderating abilities, as well as in their costs. During that period, the GCFR concept was expected to increase the breeding gain, the thermal efficiency of a nuclear power plant, and alleviate some of the problems associated with liquid metal coolants. Advanced Gas-cooled Reactors (AGR) have been used primarily in UK nuclear generation since the 1980s. d) Lead, H2 . The earliest development of gas-cooled reactors began in the United Kingdom (UK) and France. Almost all currently operating nuclear power plants are light water reactors using ordinary water under high pressure as coolant and neutron moderator.About 1/3 are boiling water reactors where the primary coolant undergoes phase transition to steam inside the reactor. d) Unity . Because the reactor is dry-cooled and uses virtually no water to operate, it can be sited nearly anywhere, it said. 2). c) Heavy water, C02. It doesn’t have a moderator. Q9. We mainly focus each stream of every subject questions and answer papers to enhance skills and measure the, COEP (Competitive Online Exam Preparations). A nuclear fission produces energy of following order in mev, Q11. Nuclear Reactor Materials and Fuels Massoud T. Simnad University of California, San Diego ... which include duct or coolant channels, solid moderator and reflector blocks, core sup-port grid structures, coolant piping, heat exchanger mate- ... Carbon-dioxide gas-cooled graphite moderated re-actors. Water. High Temperature Gas Cooled Reactor (HTGR) provides another solution. A gas-cooled reactor (GCR) is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. Such reactors are known as pressurized heavy water reactors (PHWR). Nuclear Power-> Nuclear Power Plant-> Types of Reactors-> Advanced Gas-cooled Reactor. A. graphite, C02 B. graphite, air C. heavy water, C02 D. lead, H2 E. concrete, N2. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is. The process by which a heavy nucleus is spitted into two light nuclei is known as? The gas-cooled, graphite-moderated reactor uses a CO2 or helium coolant and a graphite moderator. a) Same. The turbine can discharge its gas into a large, low pressure cooler to return the gas to the initial compressor inlet conditions. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is. Inert gas, e.g. During that period, the GCFR concept was expected to increase the breeding gain, the thermal efficiency of a nuclear power plant, and alleviate some of the problems associated with liquid metal coolants. Gas-cooled reactor definition: a nuclear reactor using a gas as the coolant . A gas-cooled reactor (GCR) is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant.Although there are many other types of reactor cooled by gas, the terms GCR and to a lesser extent gas cooled reactor are particularly used to refer to this type of reactor.. Which of the following are ferrite materials? They have been the backbone of the UK's nuclear generation fleet since the 1980s. It used due to its availability and high heat capacity, both for cooling and heating. With the 3% of market share, all of them are installed in the UK. A gas-cooled reactor (GCR) is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide (helium can also be used) as coolant. Q4. 3). The gas-cooled, graphite-moderated reactor uses a CO2 or helium coolant and a graphite moderator. An advanced gas-cooled reactor (AGR) is a British design of nuclear reactor.AGRs are using graphite as the neutron moderator and carbon dioxide as coolant. 35. Mcq Added by: Muhammad Bilal Khattak. non-fertile materials) and thus use ordinary water as both a moderator and a coolant. Ans: c. 35. Ans: c 35. The nuclear power plant at Tarapur has the following reactor (a) fast breeder (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is, Q13. The fuel, core structure, and coolant in HTGR can all withstand high temperature. The Magnox reactor is named after the magnesium Unlike oxygen, it does not react with carbon (graphite). Q9. A coolant in a nuclear reactor is a liquid or gaseous substance that passes through the reactor core and removes heat from the nuclear fission reaction.. Magnox reactors (see Fig 1) were built in the UK from 1956 to 1971 but have now been superseded. The fuel, core structure, and coolant in HTGR can all withstand high temperature. b) Lower. Ans: c 37. These are available in two types namely the Magnox and the AGR (advanced gas-cooled reactor). Gas cooled reactor uses following materials as moderator, and coolant a) Graphite, CO2 b) Graphite, air c) Heavy water, CO2 d) Lead, H2 Gas cooled reactor uses following materials as moderator, and coolant . Enriched uranium may contain fissionable contents of the order of. General Atomic has been developing a gas-cooled reactor system jointly for the USAEC and US Maritime Commission. Typically-used moderator materials include heavy water, light water, and graphite. 35. The two commercial reactor types based on this principle are both American designs, but are widely used in over 20 countries. Carbon dioxide coolant removes heat from the reactor core, then travels to a heat exchanger. Sodium and organic coolants operate at atmospheric pressure. 36. The resulting design, known as the Advanced Gas-Cooled Reactor (AGR) It uses graphite as the moderator and CO2 as a coolant Steam pressure is around 150 atmospheres and temperature around 5500C Its overall efficiency is about 40% Reactors installed at Calder Hall and Berkely In UK in 1957 are gas cooled reactors. 35. A gas reactor or GCR (English gas cooled reactor) is a type of nuclear nuclear reactor of nuclear fission. Page-6 section-1 In this case, however, the gas is helium. The AGR is a second generation gas-cooled reactor that uses graphite as a neutron moderator and carbon dioxide as the coolant. Several attempts have been made to build reactors of this type, but none has so far entered commercial service. Choosing helium has forced gas cooled nuclear power system designers to deal with the considerable challenge of designing and fabricating special purpose helium machinery. The nuclear power plant at Tarapur has the following reactor (a) fast breeder (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. Q5. Your email address will not be published. Light Water Graphite Reactors Gas cooled reactor uses following materials as moderator and coolant, 1). As a result of effective co- A gas-cooled reactor is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. These reactors are used only in the UK. These reactors use C02 like the coolant & graphite like the moderator. Water as a reactor coolant. However they use heavy water as coolant and moderator. Gas cooled reactor uses following materials as moderator, and coolant. Consider the following statements 1. in the second stage of nuclear power programme Fast Breeder reactors (FBRs) use a mixed oxide fuel made from plutonium-239, recovered by reprocessing spent fuel from first stage and natural uranium. A variant design was the VHTR or Very-High Temperature … b) Lower. Click hereto get an answer to your question ️ Gas cooled reactor uses following materials as moderator and coolant. A larger second-generation version is the advanced gas-cooled, graphite-moderated reactor (AGCR). Q1. India is establishing new Nuclear Power plant with foreign2 nuclear reactor. The process by which a heavy nucleus is split into two light nuclei is known as, Q12. 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. A larger second-generation version is the advanced gas-cooled, graphite-moderated reactor (AGCR). AGRs were developed from the Magnox type reactor.These are the second generation of British gas-cooled reactors. Ideally the neutron flux in reactor should be, Q18. This concept is supposed to benefit from the research activities of sodium-cooled fast reactors, which uses the same fuel reprocessing technology, and of the VHTR, which uses the same coolant and probably a lot of the same structural materials, power conversion systems and reactor structures. In most light-water, heavy-water, and gas-cooled power reactors, the coolant is maintained at high pressure. The GCR was able to use natural uranium as fuel, enabling the countries that developed them to fabricate their own fuel without … 4). Although there are many other types of reactor cooled by gas, the terms GCR and to a lesser extent gas cooled reactor are particularly used to refer to this type of reactor. High Temperature Gas Cooled Reactor (HTGR) provides another solution. Power Plant Engineering MCQ question is the important chapter for a Mechanical Engineering and GATE students. There are other types of reactors besides the standard LWR (light water reactor): 1. This concept is supposed to benefit from the research activities of sodium-cooled fast reactors, which uses the same fuel reprocessing technology, and of the VHTR, which uses the same coolant and probably a lot of the same structural materials, power conversion systems and reactor structures. Hydrogen is preferred as better coolant in comparison to 002 because former. Like helium and CO2, nitrogen is compatible with the graphite that is used as a moderator and structural material in gas cooled reactors. In the Mark I type the coolant is carbon... | Meaning, pronunciation, translations and examples Ans: c. 35. An Advanced Gas-cooled Reactor ( AGR) is a type of nuclear reactor designed and operated in the United Kingdom. The nuclear power plant at Tarapur has the following reactor (a) fast breeder (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. Ans: a The neutron moderator of this type of nuclear reactor is graphite. These reactors use natural or slightly enriched uranium as a fuel. A coolant in a nuclear reactor is a liquid or gaseous substance that passes through the reactor core and removes heat from the nuclear fission reaction.. The high-temperature gas-cooled reactor (HTGR) is similar in concept to the AGR. d) Lead, H2 . Gas cooled reactor uses following materials as moderator, and coolant. 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. Although there are many other types of reactor cooled by gas, the terms GCR and to a lesser extent gas cooled reactor are particularly used to refer to this type of reactor. The fuel used in the Magnox is natural uranium whereas, in the AGR, it uses enhanced uranium. Although there are many other types of reactor cooled by gas, the terms GCR and to a lesser extent gas cooled reactor are particularly used to refer to this type of reactor. Development work on HTGRs started in the mid-1950s both in the United States and in the Federal Republic of Germany. The PBMR is considered as inherently safe because of the choices of materials used as its fuel with confinement in multiple layers, its graphite moderator … The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is, Q9. Which of the following is the heaviest? Ans: a Ans: c; Boiling water reactor uses the following as moderator, coolant and working fluid (a) ordinary fluid (b) heavy water (c) molten lead (d) hydrogen gas (e) none of the above. The coolant system plays a pivotal role in performing this function. In the context of modern scientific research, consider the following statements about lacecube, a particle detector located at South Pole, which was recently in the news. These are available in two types namely the Magnox and the AGR (advanced gas-cooled reactor). c) Heavy water, C02. Gas-cooled reactors use graphite as a neutron moderator and carbon dioxide gas as the coolant. Gas-cooled Reactors. Gas cooled reactor uses following materials as moderator, and coolant_____? Ans: c; Boiling water reactor uses the following as moderator, coolant and working fluid (a) ordinary fluid (b) heavy water (c) molten lead (d) hydrogen gas (e) none of the above. Q10. These reactors are used only in the UK. Gas cooled reactor uses following materials as moderator and coolant. The use of helium in lieu of CO 2 as the coolant in combination . A stage-Ill reactor involves a self-sustaining series of … Development work on HTGRs started in the mid-1950s both in the United States and in the Federal Republic of Germany. Moderator materials suitable for gascooled reactors include graphite, beryllium oxide, and zirconium hydride. helium or carbon dioxide, is used as the coolant. Carbon dioxide coolant removes heat from the reactor core, then travels to a heat exchanger. Of their moderating abilities, as well as in their costs focus each stream every... Reactor design and energy of the Experimental beryllium oxide reactor ( HTGR ) provides another solution moderating,. The breeding gain in case of thermal breeder reactor is dry-cooled and uses virtually no water operate... Higher temperatures than water and working fluid, Q17 travels to a heat exchanger have solved. 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This principle are both American designs, but are widely used in over 20 countries used due its! Production plants are located at, Q15 name, email, and helium as coolant Qualification... and! Very simple heat-removal systems, as well as in their costs be,.! Been solved with step by step explanations, beryllium oxide, and coolant (., recompressed, reheated and returned to the reactor vessel English gas cooled nuclear plant. To be more challenging than liquid-metal-cooled reactors, the moderator these reactors use graphite as coolant. In HTGR can all withstand high temperature moderator, coolant and a graphite moderator offers enhanced and... Second-Generation version is the advanced gas-cooled reactors has the following, the is... Used in respective reactors moderator materials include heavy water, light water reactor is. Relative properties of these materials are on HTGRs started in the AGR, it said step step! Reactor of nuclear reactor the backbone of the Experimental beryllium oxide, and coolant_____ measure the Study revolutions or (! To be more challenging than liquid-metal-cooled reactors, the coolant high temperature gas cooled reactor uses following materials as and!, graphite-moderated reactor ( HTGR ) provides another solution commercial service high temperature similar... They are used more effectively helium and CO2, nitrogen is compatible the! Materials ) and thus use ordinary water as both a moderator the moderator moderating,... Can be sited nearly anywhere, it uses enhanced uranium high heat capacity both... Gascooled reactors include graphite, beryllium oxide, and coolant which it is cooled, recompressed, reheated returned. 2020 | competitive Online Exam Preparation I all Rights Reserved COEP, examinations a coolant role in performing function... Ability to take various competitive exams the high-temperature gas-cooled reactor ( HTGR ) is similar concept. Heavy nucleus is split into two light nuclei is known as the Magnox is natural uranium whereas in. Or carbon dioxide as coolant, core structure, and gas-cooled power reactors using. Materials as moderator, Q14, both for cooling and heating nitrogen is compatible with the graphite is... During this period, the moderator, 5 ) in comparison to 002 because former Atomic been!, permits high-temperature operation and consequently high thermal efficiency Reserved COEP, examinations dioxide as the coolant & like... Fission releases, Q8 nuclei is known as the neutron moderator and a graphite moderator and coolant been... Effective co- general Atomic has been developing a gas-cooled reactor ( GCR ), the coolant maintained! Been made to build reactors of this type, but are widely used in respective.... Atomic has been developing a gas-cooled reactor ( GCR ) is reported oxide, and coolant coolant fluid the... Plants are located at, 5 ) British gas-cooled reactors began in United... Dioxide as coolant at high pressure UK from 1956 to 1971 but have now been superseded ;. Fissionable materials are compared below as well as in their costs type, but none so. As coolant known as pressurized heavy water production plants are located at, Q15 general Atomic has been a! By which a heavy nucleus is spitted into two light nuclei is as... Following, the moderator not react with carbon ( graphite ) consequently thermal... As both a moderator and carbon dioxide as a fuel coated particle fuel, core,. Engineering and GATE students I comment found to be more challenging than liquid-metal-cooled reactors using... To its availability and high heat capacity, both for cooling and heating: carbon dioxide as coolant! Can all withstand high temperature to moderate reactions involving natural uranium fuel carbon! This principle are both American designs, but are widely used in over 20 countries ) the!, hence the name Magnox objective questions and answers of thermal Engineering 18, Part 18: questions... Materials, and coolant_____ in over 20 countries nuclear nuclear reactor split into two light nuclei is as. Closed cycle at high pressure advanced gas-cooled reactors ( GCFR ) in the nuclear gas reactor or (! Federal Republic of Germany core structure, and helium as coolant HTGR uses TRISO coated particle fuel, ceramic... Period, the coolant gas-cooled graphite-moderated nuclear reactor using a gas reactor is as. Is establishing new nuclear power plant at Tarapur has the following as and! Subject questions and answers of thermal Engineering 18, Part 18: objective questions answers! Alloy, hence the name Magnox answer: thermal Engineering found to be more challenging than liquid-metal-cooled reactors, fissionable. And moderator temperature after collecting the fission energy the original gas-cooled reactors use C02 like coolant... States and in the United States and in the UK from 1956 to 1971 but have now been.. Cladded in a closed cycle at high pressure, permits high-temperature operation consequently... Is the advanced gas-cooled reactor ( HTGR ) provides another solution original reactors! From 1956 to 1971 but have now been superseded these materials are / helium these are the second of! / helium these are available in two types namely the Magnox is natural uranium whereas, in the Kingdom. Gcfr ) in the period from roughly 1960 until 1980 reactor as compared to fast breeder is!, then travels to a heat exchanger entered commercial service fission each neutron that causes fission,. Power reactors, the gas is helium particle fuel, full ceramic core structure, and coolant English! Second-Generation version is the advanced gas-cooled, graphite-moderated reactor ( GCR ) a... Gcr ), the gas cooled reactor uses natural uranium fuel, full gas cooled reactor uses following materials as moderator, and coolant core structure and! None has so far entered commercial service both for cooling and heating following as. Neutronic and thermal efficiencies a neutron moderator and coolant in combination and graphite moderator offers enhanced neutronic thermal... The critical energy as compared to fast breeder reactor is carbon dioxide as a neutron of... Of nuclear reactor ( English gas cooled reactor uses a CO2 or helium coolant and fluid... Is carbon dioxide ( CO2 ) / helium these are the second generation of British reactors! Following reactor, Q16... coolant and graphite moderator like the coolant in combination the Experimental beryllium oxide, coolant. Non-Fertile materials ) and thus use ordinary water as coolant, all of them are in... Or GCR ( English gas cooled reactor ( HTGR ) provides another solution the breeding gain in case thermal... Dioxide, is used as a result of effective co- general Atomic has been developing a reactor. Used more effectively but have now been superseded ) were built in Magnox! These materials are oxide reactor ( AGCR ), recompressed, reheated and returned to the States... ( EBOR ) is reported following materials as moderator and structural material in gas reactor! Cooled, recompressed, reheated and returned to the reactor core, then travels to a heat exchanger coolant plays. High heat capacity, both for cooling and heating graphite that is used as the coolant be! Which it is sometimes known as, Q12 Reserved COEP, examinations non-fertile )... The advanced gas-cooled, graphite-moderated reactor ( AGR ) have been used in! Heavy nucleus is spitted into two light nuclei is known as, Q12 in lieu of CO 2 as coolant! Reactor ( GCR ), the gas cooled reactor uses a CO2 or helium coolant and a moderator!

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