The use of helium in lieu of CO 2 as the coolant in combination . These reactors are used only in the UK. 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. Typically-used moderator materials include heavy water, light water, and graphite. 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. ⇒ 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 35. Magnox reactors (see Fig 1) were built in the UK from 1956 to 1971 but have now been superseded. c) Heavy water, C02. 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. Mcq Added by: Muhammad Bilal Khattak. Its use is limited to the United Kingdom; it is sometimes known as the Magnox reactor. Ans: a It uses uranium fuel, a graphite moderator and a gas as a coolant. The fuel, core structure, and coolant in HTGR can all withstand high temperature. b) Lower. non-fertile materials) and thus use ordinary water as both a moderator and a coolant. Ans: a A larger second-generation version is the advanced gas-cooled, graphite-moderated reactor (AGCR). Choosing helium has forced gas cooled nuclear power system designers to deal with the considerable challenge of designing and fabricating special purpose helium machinery. 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. Your email address will not be published. d) Lead, H2 . 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. 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. 36. 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. There are several different types of moderating materials, and each have places where they are used more effectively. 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. 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. Q9. In most light-water, heavy-water, and gas-cooled power reactors, the coolant is maintained at high pressure. Gas-cooled Reactors. Q8. 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. 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. A gas-cooled reactor is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. 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. In the Gas Cooled Reactor (GCR), the moderator is graphite. The Magnox reactor is named after the magnesium Reactor Type Gas-cooled Reactor Coolant Helium ... 1.5 High Temperature Materials Qualification ... coolant and graphite moderator. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is, Q13. These reactors are used only in the UK. Nuclear Power-> Nuclear Power Plant-> Types of Reactors-> Advanced Gas-cooled Reactor. Enriched uranium may contain fissionable contents of the order of. Q10. c) Higher. These are available in two types namely the Magnox and the AGR (advanced gas-cooled reactor). The neutron moderator of this type of nuclear reactor is graphite. b) Lower. Several attempts have been made to build reactors of this type, but none has so far entered commercial service. 3). 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 variant design was the VHTR or Very-High Temperature … A review is given of developments in the area of Gas-Cooled Fast Reactors (GCFR) in the period from roughly 1960 until 1980. 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. Some other materials (like NaK, Lead) can also be used as coolant in nuclear 8). 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. Gas-cooled Reactors. Gas cooled reactor uses following materials as moderator, ... Gas cooled reactor uses following materials as moderator, and coolant_____? In this case, however, the gas is helium. These reactors use natural or slightly enriched uranium as a fuel. 35. We mainly focus each stream of every subject questions and answer papers to enhance skills and measure the, COEP (Competitive Online Exam Preparations). 2). Gas-cooled reactors use graphite as a neutron moderator and carbon dioxide gas as the coolant. In the second part of the paper, we provide an … Ans: c . 4.4 SAFETY ASPECTS OF THE PBMR . 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. The relative properties of these materials are compared below. Graphite is typically used to moderate reactions involving natural uranium fuel. We mainly focus each stream of every subject questions and answer papers to enhance skills and measure the Study revolutions. U-233 and Pu-239; U-23i and Pu-233; ... moderator should be used; coolant should be employed; ... 10. Practicing these questions will improve your ability to take various competitive exams. Heavy water production plants are located at, 5). d) Lead, H2 . c) Heavy water, C02. Which of the following are ferrite materials? d) Unity . 36. Q8. Gas cooled reactor uses following materials as moderator, and coolant. 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. The gas-cooled graphite-moderated nuclear reactor uses natural uranium fuel and carbon dioxide as a coolant. b) Graphite, air. Graphite is typically used to moderate reactions involving natural uranium fuel. The gas-cooled, graphite-moderated reactor uses a CO2 or helium coolant and a graphite moderator. General Atomic has been developing a gas-cooled reactor system jointly for the USAEC and US Maritime Commission. India is establishing new Nuclear Power plant with foreign2 nuclear reactor. a) Graphite, C02. Gas cooled reactor uses fol... general knowledge. Copyright © 2020 | Competitive Online Exam Preparation I All Rights Reserved COEP, examinations. Ans: c 37. A gas-cooled reactor (GCR) is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. Click hereto get an answer to your question ️ Gas cooled reactor uses following materials as moderator and coolant. It used due to its availability and high heat capacity, both for cooling and heating. Gas cooled reactor uses following materials as moderator, and coolant, Q10. 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. 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. There are other types of reactors besides the standard LWR (light water reactor): 1. Gas cooling, in a closed cycle at high pressure, permits high-temperature operation and consequently high thermal efficiency. HTGR uses TRISO coated particle fuel, full ceramic core structure, and helium as coolant. In nuclear fission each neutron that causes fission releases, Q8. Like helium and CO2, nitrogen is compatible with the graphite that is used as a moderator and structural material in gas cooled reactors. 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. The coolant of the nuclear gas reactor is carbon dioxide in the gaseous state. These reactors use C02 like the coolant & graphite like the moderator. The first nuclear power plant in India is located at, Q15. High Temperature Gas Cooled Reactor (HTGR) provides another solution. To your question ️ gas cooled reactor uses following materials as moderator, coolant and graphite as better coolant HTGR... And coolant_____ high-temperature operation and consequently high thermal efficiency, light water reactor uses following materials moderator... 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