Which of the following organisations is the oldest. These are available in two types namely the Magnox and the AGR (advanced gas-cooled reactor). They have been the backbone of the UK's nuclear generation fleet since the 1980s. General Atomic has been developing a gas-cooled reactor system jointly for the USAEC and US Maritime Commission. The neutron moderator of this type of nuclear reactor is graphite. Graphite is typically used to moderate reactions involving natural uranium fuel. graphite, C02; graphite, air; heavy water, C02; 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. Q9. A stage-Ill reactor involves a self-sustaining series of … The high-temperature gas-cooled reactor (HTGR) is similar in concept to the AGR. Several attempts have been made to build reactors of this type, but none has so far entered commercial service. These nuclear plants will be established at. Ideally the neutron flux in reactor should be, Q18. Carbon dioxide coolant removes heat from the reactor core, then travels to a heat exchanger. 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. The first nuclear power plant in India is located at, Q15. 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. Amongst the following, the fissionable materials are . During this period, the GCFR concept was found to be more challenging than liquid-metal-cooled reactors, and none were ever constructed. High Temperature Gas Cooled Reactor (HTGR) provides another solution. We mainly focus each stream of every subject questions and answer papers to enhance skills and measure the Study revolutions. Gas cooled reactor uses following materials as moderator, and coolant, Q10. These reactors use natural or slightly enriched uranium as a fuel. 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. Research reactors have very simple heat-removal systems, as their primary purpose is to perform research and not generate power. Ans: c . In nuclear fission each neutron that causes fission releases, Q8. 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. The nuclear power plant at Tarapur has the following reactor, Q16. Q8. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is, Q9. 36. Gas cooled reactor uses following materials as moderator, and coolant. Which of the following particles is the lightest? Ans: c. 35. Q10. c) Higher. Like helium and CO2, nitrogen is compatible with the graphite that is used as a moderator and structural material in gas cooled reactors. Q5. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is, Q13. The relative properties of these materials are compared below. The Magnox reactor is named after the magnesium Advanced Gas-cooled Reactors (AGR) have been used primarily in UK nuclear generation since the 1980s. Objective Questions and Answer: Thermal Engineering 18, Part 18: Objective questions and answers of Thermal Engineering. Typically-used moderator materials include heavy water, light water, and graphite. d) Lead, H2 . In the Gas Cooled Reactor (GCR), the moderator is graphite. These reactors use C02 like the coolant & graphite like the moderator. 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 compilation is presented of the technical information presently available which bears on the problem of selecting a coolant for the graphite- moderated gascooled reactor. 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. Unlike oxygen, it does not react with carbon (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. Development work on HTGRs started in the mid-1950s both in the United States and in the Federal Republic of Germany. a) Graphite, C02. The fuel, core structure, and coolant in HTGR can all withstand high temperature. Graphite is typically used to moderate reactions involving natural uranium fuel. HTGR uses TRISO coated particle fuel, full ceramic core structure, and helium as coolant. 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. 4.4 SAFETY ASPECTS OF THE PBMR . 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