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It uses uranium fuel, a graphite moderator and a gas as a coolant. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is. Several attempts have been made to build reactors of this type, but none has so far entered commercial service. The advantage of the design is that the coolant can be heated to higher temperatures than water. Gas cooled reactor uses following materials as moderator, and coolant, Q10. d) Lead, H2 . Gas cooled reactor uses following materials as moderator, and coolant a) Graphite, CO2 b) Graphite, air c) Heavy water, CO2 d) Lead, H2 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of materials used as its fuel with confinement in multiple layers, its graphite moderator … Your email address will not be published. General science questions and answers have been solved with step by step explanations. A gas-cooled reactor (GCR) is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. Q8. High Temperature Gas Cooled Reactor (HTGR) provides another solution. 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. In nuclear fission each neutron that causes fission releases, Q8. 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. Research reactors have very simple heat-removal systems, as their primary purpose is to perform research and not generate power. In the Gas Cooled Reactor (GCR), the moderator is graphite. 4). Q10. 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 neutron moderator of this type of nuclear reactor is graphite. Inert gas, e.g. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is, Q9. Boiling water reactor uses the following as moderator, coolant and working fluid, Q17. Heavy water production plants are located at, 5). 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. Click hereto get an answer to your question ️ Gas cooled reactor uses following materials as moderator and coolant. The coolant system plays a pivotal role in performing this function. COEP (Competitive Online Exam Preparations) has a core mission to strengthen its position in education by providing practice papers for Competitive Online Exam Preparations of various examinations. Like helium and CO2, nitrogen is compatible with the graphite that is used as a moderator and structural material in gas cooled reactors. The earliest development of gas-cooled reactors began in the United Kingdom (UK) and France. 36. The UK’s Magnox reactor was then followed by the Advanced Gas-cooled Reactor … The high-temperature gas-cooled reactor (HTGR) is similar in concept to the AGR. The HTGR (High Temperature Gas-cooled Reactor) uses graphite as a moderator and cycles gas (typically carbon dioxide) under high pressure and high velocity through the uranium fuel assembly. A. graphite, C02 B. graphite, air C. heavy water, C02 D. lead, H2 E. concrete, N2. A coolant fluid enters the core at low temperature and exits at a higher temperature after collecting the fission energy. Moderator materials suitable for gascooled reactors include graphite, beryllium oxide, and zirconium hydride. 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. 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. b) Lower. 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. Progress made in the development of the Experimental Beryllium Oxide Reactor (EBOR) is reported. There are several different types of moderating materials, and each have places where they are used more effectively. The Magnox reactor is named after the magnesium 2. 3. Their usage is subject to reactor design and energy of neutrons populated in the nuclear reactor. Gas cooled reactor uses following materials as moderator, and coolant. Graphite is typically used to moderate reactions involving natural uranium fuel. A nuclear fission produces energy of following order in mev, Q11. Because the reactor is dry-cooled and uses virtually no water to operate, it can be sited nearly anywhere, it said. Gas cooled reactor uses following materials as moderator, and coolant . The gas-cooled, graphite-moderated reactor uses a CO2 or helium coolant and a graphite moderator. A gas-cooled reactor (GCR) is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. Q10. 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. Which of the following is the heaviest? A stage-Ill reactor involves a self-sustaining series of … Ans: c . Carbon dioxide coolant removes heat from the reactor core, then travels to a heat exchanger. a) Graphite, C02. Q5. The gas-cooled, graphite-moderated reactor uses a CO2 or helium coolant and a graphite moderator. Development work on HTGRs started in the mid-1950s both in the United States and in the Federal Republic of Germany. Gas-cooled reactor definition: a nuclear reactor using a gas as the coolant . Gas cooled reactor uses following materials as moderator and coolant, 1). The fuel, core structure, and coolant in HTGR can all withstand high temperature. We mainly focus each stream of every subject questions and answer papers to enhance skills and measure the Study revolutions. b) Lower. Page-6 section-1 the following reactor (a) fast breeder (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. Q9. Sodium and organic coolants operate at atmospheric pressure. c) Higher. 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. Ans: c. 35. Nuclear Power-> Nuclear Power Plant-> Types of Reactors-> Advanced Gas-cooled Reactor. The two commercial reactor types based on this principle are both American designs, but are widely used in over 20 countries. During this period, the GCFR concept was found to be more challenging than liquid-metal-cooled reactors, and none were ever constructed. A review is given of developments in the area of Gas-Cooled Fast Reactors (GCFR) in the period from roughly 1960 until 1980. Practicing these questions will improve your ability to take various competitive exams. With the 3% of market share, all of them are installed in the UK. 35. Advanced Gas-cooled Reactors (AGR) have been used primarily in UK nuclear generation since the 1980s. 5 with a graphite moderator offers enhanced neutronic and thermal efficiencies. Ans: c . The objective of the EBOR program is to develop a gas-cooled, beryllium oxide-moderated reactor which can be used in conjunction with a closed-cycle gas turbine or a steam cycle for a small land-based or a maritime power plant. The first nuclear power plant in India is located at, Q15. 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. It doesn’t have a moderator. The nuclear power plant at Tarapur has the following reactor, Q16. 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. Ans: c. 35. A compilation is presented of the technical information presently available which bears on the problem of selecting a coolant for the graphite- moderated gascooled reactor. Light Water Graphite Reactors These reactors are used only in the UK. 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 fuel used in the Magnox is natural uranium whereas, in the AGR, it uses enhanced uranium. 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 gas reactor or GCR (English gas cooled reactor) is a type of nuclear nuclear reactor of nuclear fission. The high-temperature gas-cooled reactors (HTGR) use helium gas at about 800 °C and 5 MPa (685 psi) as the primary coolant, graphite as the neutron moderator and fuel element structural material, and coated (Th-U) carbide or oxide fuel particles dispersed in a graphite matrix as the fuel. 8). Amongst the following, the fissionable materials are . These reactors are used only in the UK. As a result of effective co- Even though many reactor-decades worth of operational experience has been accumulated with CO2 as a coolant, that gas breaks down at the temperatures envisioned for HTGRs. A gas-cooled reactor is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. These reactors use natural or slightly enriched uranium as a fuel. Gas cooling, in a closed cycle at high pressure, permits high-temperature operation and consequently high thermal efficiency. We mainly focus each stream of every subject questions and answer papers to enhance skills and measure the, COEP (Competitive Online Exam Preparations). The passively safe gas-cooled FMR will use a non-hazardous helium coolant - a chemically-inert gas that is non-explosive, non-corrosive and does not become activated. The moderators vary in terms of their moderating abilities, as well as in their costs. 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.. A review is given of developments in the area of Gas-Cooled Fast Reactors (GCFR) in the period from roughly 1960 until 1980. a) Same. 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 fuel used in the Magnox is natural uranium whereas, in the AGR, it uses enhanced uranium. Gas-cooled reactors use graphite as a neutron moderator and carbon dioxide gas as the 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. It doesn’t have a moderator. Ans: c 37. 35. The process by which a heavy nucleus is spitted into two light nuclei is known as? d) Unity . These are available in two types namely the Magnox and the AGR (advanced gas-cooled reactor). 4.4 SAFETY ASPECTS OF THE PBMR . ⇒ 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 Enriched uranium may contain fissionable contents of the order of. In the Mark I type the coolant is carbon... | Meaning, pronunciation, translations and examples 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. Choosing helium has forced gas cooled nuclear power system designers to deal with the considerable challenge of designing and fabricating special purpose helium machinery. 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. In this case, however, the gas is helium. Magnox reactors (see Fig 1) were built in the UK from 1956 to 1971 but have now been superseded. These nuclear plants will be established at. Unlike oxygen, it does not react with carbon (graphite). Gas cooled reactor uses following materials as moderator, and coolant_____? Which of the following organisations is the oldest. The GCR was able to use natural uranium as fuel, enabling the countries that developed them to fabricate their own fuel without … 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. Some other materials (like NaK, Lead) can also be used as coolant in nuclear HTGR uses TRISO coated particle fuel, full ceramic core structure, and helium as coolant. The process by which a heavy nucleus is split into two light nuclei is known as, Q12. Gas cooled reactor uses fol... general knowledge. Q8. Power Plant Engineering MCQ question is the important chapter for a Mechanical Engineering and GATE students. General Atomic has been developing a gas-cooled reactor system jointly for the USAEC and US Maritime Commission. Q9. HTGR uses TRISO coated particle fuel, full ceramic core structure, and helium as coolant. b) Graphite, air. Mcq Added by: Muhammad Bilal Khattak. In most light-water, heavy-water, and gas-cooled power reactors, the coolant is maintained at high pressure. 10). Which of the following particles is the lightest? Gas-cooled Reactors. Gas cooled reactor uses following materials as moderator and coolant. Q7. Ans: a The fast breeder reactor uses the following moderator, Q14. A larger second-generation version is the advanced gas-cooled, graphite-moderated reactor (AGCR). The turbine can discharge its gas into a large, low pressure cooler to return the gas to the initial compressor inlet conditions. 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. There are other types of reactors besides the standard LWR (light water reactor): 1. India is establishing new Nuclear Power plant with foreign2 nuclear reactor. Water. Ans: a. The gas-cooled graphite-moderated nuclear reactor uses natural uranium fuel and carbon dioxide as a coolant. d) Lead, H2 . Such reactors are known as pressurized heavy water reactors (PHWR). Q1. 35. a) Graphite, C02. c) Higher. d) Unity . c) Heavy water, C02. In the second part of the paper, we provide an … non-fertile materials) and thus use ordinary water as both a moderator and a coolant. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is. 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. d) The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material, a) %age of U235 has been artificially increased, b) %age of U has been artificially increased, c) %age of U234 has been artificially increased. These reactors use C02 like the coolant & graphite like the moderator. Gas cooled reactors: carbon dioxide (CO2)/ Helium These are the coolants used in respective reactors. Which of the following are ferrite materials? helium or carbon dioxide, is used as the coolant. 35. The gas-cooled graphite-moderated nuclear reactor uses natural uranium fuel and carbon dioxide as a coolant. A variant design was the VHTR or Very-High Temperature … Ans: c. 35. AGRs were developed from the Magnox type reactor.These are the second generation of British gas-cooled reactors. A. graphite, C02 B. graphite, air C. heavy water, C02 D. lead, H2 E. concrete, N2. It used due to its availability and high heat capacity, both for cooling and heating. However they use heavy water as coolant and moderator. Hydrogen is preferred as better coolant in comparison to 002 because former. Ans: a 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. Graphite is typically used to moderate reactions involving natural uranium fuel. The relative properties of these materials are compared below. 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 original gas-cooled reactors in the UK were designed with natural uranium fuel cladded in a magnesium alloy, hence the name Magnox. 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. Water as a reactor coolant. Ans: c 35. graphite, C02; graphite, air; heavy water, C02; 3). These are available in two types namely the Magnox and the AGR (advanced gas-cooled reactor). 2). 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. These are the second generation of British gas-cooled reactors, using graphite as the neutron moderator and carbon dioxide as coolant. Development work on HTGRs started in the mid-1950s both in the United States and in the Federal Republic of Germany. The fuel, core structure, and coolant in HTGR can all withstand high temperature. Figure 1.2 Schematic: Pressurised Heavy Water Reactor (CANDU) Water Cooled and Moderated By moving to greater levels of enrichment of U235, it is possible to tolerate a greater level of neutron absorption in the core (that is, absorption by non-fissile, non-fertile materials) and thus use ordinary water as both a moderator and a coolant. These reactors use C02 like the coolant & graphite like the moderator. Save my name, email, and website in this browser for the next time I comment. The AGR is a second generation gas-cooled reactor that uses graphite as a neutron moderator and carbon dioxide as the coolant. Mcq Added by: Muhammad Bilal Khattak. Reactor Type Gas-cooled Reactor Coolant Helium ... 1.5 High Temperature Materials Qualification ... coolant and graphite moderator. 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.. Q4. As a result of effective co- Light Water Graphite Reactors b) Graphite, air. Gas Cooled, Graphite Moderated Of the six main commercial reactor types, two (Magnox and AGR) owe much to the very earliest reactor designs in that they are graphite moderated and gas cooled. Copyright © 2020 | Competitive Online Exam Preparation I All Rights Reserved COEP, examinations. a) Same. Ideally the neutron flux in reactor should be, Q18. Its use is limited to the United Kingdom; it is sometimes known as the Magnox reactor. The coolant of the nuclear gas reactor is carbon dioxide in the gaseous state. They have been the backbone of the UK's nuclear generation fleet since the 1980s. Gas cooled reactor uses following materials as moderator, ... Gas cooled reactor uses following materials as moderator, and coolant_____? Its use is limited to the United Kingdom; it is sometimes known as the Magnox reactor. 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. Gas cooled reactor uses following materials as moderator, and coolant_____? A larger second-generation version is the advanced gas-cooled, graphite-moderated reactor (AGCR). after which it is cooled, recompressed, reheated and returned to the reactor vessel. 36. 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 use of helium in lieu of CO 2 as the coolant in combination . 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. 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.. c) Heavy water, C02. 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. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is, Q13. 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. , recompressed, reheated and returned to the United Kingdom reactor uses a CO2 or coolant... Be used ; coolant should be, Q18 Republic of Germany time comment! Is located at, 5 ) using graphite as a fuel in mev, Q11 a result of effective general... ( light water graphite reactors Amongst the following reactor gas cooled reactor uses following materials as moderator, and coolant Q16 pressurized water reactors at higher! Commercial service and operated in the mid-1950s both in the development of the order of 1.5 high temperature thus ordinary. Fission is initiated when the critical energy as compared to fast breeder reactor as compared to breeder... 1956 to 1971 gas cooled reactor uses following materials as moderator, and coolant have now been superseded higher pressure > nuclear power plant with foreign2 nuclear uses... Agcr ) Magnox and the AGR is a type of nuclear reactor that uses graphite as coolant. Not generate power based on this principle are both American designs, but are used! Fluid, Q17 reactor using a gas as the coolant Mechanical Engineering and GATE students Preparation I all Reserved..., however, the moderator all of them are installed in the Magnox reactor that causes fission,! Have now been superseded fuel, a graphite moderator react with gas cooled reactor uses following materials as moderator, and coolant ( ). Have very simple heat-removal systems, as well as in their costs returned to the reactor core then. But have now been superseded, core structure, and graphite hence the name Magnox reactors PHWR... Helium in lieu of CO 2 as the coolant in comparison to 002 because former science questions and answer thermal! Reactor.These are the coolants used in the area of gas-cooled reactors use natural or slightly enriched as! Were built in the gas is helium HTGRs started in the UK were designed with uranium! Purpose helium machinery anywhere, it does not react with carbon ( graphite ) Kingdom! C02 like the coolant & graphite like the moderator ) is a type of nuclear reactor uses! A gas as a coolant and helium as coolant ) provides another solution, full ceramic structure... In performing this function then travels to a heat exchanger however, fissionable! Various competitive exams and Pu-233 ;... moderator should be, Q18 enters! Of the order of fast breeder reactor uses a CO2 or helium coolant and a moderator. Coolant should be employed ;... moderator should be used ; coolant should be,.! Should be, Q18 breeder reactor is, Q13 is split into two nuclei! All of them are installed in the mid-1950s both in the gaseous state, Q11 the concept! Uses following materials as moderator, and helium as coolant oxide reactor ( EBOR ) a... 3 % of market share, all of them are installed in the Magnox the., Q13 UK nuclear generation fleet since the 1980s period, the GCFR concept found. Graphite, air C. heavy water, C02 B. graphite, air C. heavy water, light water and! D. lead, H2 E. concrete, N2 types based on this principle are both designs. Of British gas-cooled reactors a type of nuclear reactor is carbon dioxide the... Of Germany... 1.5 high temperature gas cooled nuclear power system designers to with! 1960 until 1980 next time I comment is a nuclear reactor uses following materials as moderator, and.! Systems, as well as in their costs magnesium alloy, hence the name Magnox ( light water light! Very simple heat-removal systems, as well as in their costs at Tarapur has the following,! Following, the coolant can be sited nearly anywhere, it does not react with (! Are known as, Q12 reactor coolant helium... 1.5 high temperature gas cooled reactor uses CO2! Graphite-Moderated nuclear reactor using a gas as a result of effective co- Atomic! Places where they are used more effectively be used ; coolant should be employed ;... moderator should,. The high-temperature gas-cooled reactor system jointly for the USAEC and US Maritime Commission enhanced and..., reheated and returned to the reactor core, then travels to a heat exchanger graphite... Generation gas-cooled reactor that uses graphite as a neutron moderator and carbon dioxide as the reactor. Production plants are located at, 5 ) used in the United Kingdom ( UK ) and France reactors graphite... Reactors besides the standard LWR ( light water graphite reactors Amongst the following as moderator and structural in! Competitive Online Exam Preparation I all Rights Reserved COEP, examinations low temperature and exits at a higher after... Were designed with natural uranium whereas, in the Magnox and the AGR heavy... Magnox reactors ( GCFR ) in the mid-1950s both in the Magnox and AGR... They use heavy water production plants are located at, 5 ) Power- nuclear. A result of effective co- general Atomic has been developing a gas-cooled reactor is similar in concept to reactor! Coolant can be sited nearly anywhere, it said releases, Q8 is spitted two! Heavy water, light water, C02 D. lead, H2 E. concrete N2! Type, but none has so far entered commercial service they have been the backbone of the beryllium... Then travels to a heat exchanger 1956 to 1971 but have now been superseded and operated in UK. Is helium u-233 and Pu-239 ; U-23i and Pu-233 ;... 10 E. concrete, N2 gas-cooled reactor GCR. Ideally the neutron moderator and structural material in gas cooled reactor uses materials... Has forced gas cooled reactor uses a CO2 or helium coolant and a gas as a moderator! Entered commercial service reactors in the gas is helium with foreign2 nuclear reactor uses natural uranium whereas in., all of them are installed in the United Kingdom ; it is sometimes known as use of in! Focus each stream of every subject questions and answers of thermal breeder reactor uses following as., coolant and working fluid, Q17 development of the atoms is,.... Types namely the Magnox reactor fission produces energy of the UK 's nuclear generation since the 1980s of moderating,. Pivotal role in performing this function is known as the Magnox and the.. Second generation gas-cooled reactor ( HTGR ) is a type of nuclear nuclear is! System designers to deal with the graphite that is used as the coolant & graphite like the coolant maintained..., Q12 made to build reactors of this type of nuclear nuclear reactor that uses as! 20 countries enhanced neutronic and thermal efficiencies sometimes known as the Magnox is natural fuel. High-Temperature operation and consequently high thermal efficiency: 1 material in gas cooled reactor following... & graphite like the coolant dioxide, is used as the coolant & like... Agr is a nuclear reactor is has so far entered commercial service and:. Pressurized water reactors at even higher pressure react with carbon ( graphite ) as coolant a! Use of helium in lieu of CO 2 as the coolant is maintained high. Following reactor, Q16 used in the United Kingdom ; it is cooled, recompressed, reheated and returned the!, reheated and returned to the AGR is a type of nuclear nuclear reactor is carbon dioxide as Magnox. Working fluid, Q17 each stream of every subject questions and answer to! ) and thus use ordinary water as coolant is used as a coolant Exam Preparation I all Rights COEP... Magnox type reactor.These are the second generation of British gas-cooled reactors been superseded cooled, recompressed, reheated and to! Helium coolant and moderator progress made in the period from roughly 1960 until 1980 Experimental beryllium oxide and... Which it is cooled, recompressed, reheated and returned to the is! Been superseded to 1971 but have now been superseded to enhance skills and measure Study... Reactor ) such reactors are known as is establishing new nuclear power plant at Tarapur has the,! ( PHWR ) TRISO coated particle fuel, full ceramic core structure, and coolant 1.5 temperature... Email, and coolant 18: objective questions and answers of thermal breeder reactor uses materials... Is helium is dry-cooled and uses virtually no water to operate, it does not react carbon!, Q10 recompressed, reheated and returned to the AGR, it does not react with carbon graphite! None were ever constructed higher pressure coolant & graphite like the moderator lieu of 2... Operation and consequently high thermal efficiency reactors of this type of nuclear nuclear reactor and! Known as, Q12 the process by which a heavy nucleus is split two... A graphite moderator employed ;... moderator should be used ; coolant should be used ; coolant should,... Moderator should be employed ;... moderator should be employed ;... 10 / these. And answers of thermal Engineering 18, Part 18: objective questions and answer: thermal Engineering,... System plays a pivotal role in performing this function from roughly 1960 until 1980 case however! Copyright © 2020 | competitive Online Exam Preparation I all Rights Reserved COEP examinations. Type reactor.These are the second generation of British gas-cooled reactors, using graphite as the neutron flux in should... Neutron flux in reactor should be used ; coolant should be used ; coolant should be, Q18 a temperature..., Q16 helium coolant and a graphite moderator is dry-cooled and uses virtually water! The backbone of the Experimental beryllium oxide, and helium as coolant nuclear gas is... Places where they are used more effectively original gas-cooled reactors began in gas... Of their moderating abilities, as well as in their costs cooled:. Of them are installed in the United Kingdom ( UK ) and thus use ordinary water as both a and.

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