The Advanced High Temperature Reactor (AHTR) is a new reactor concept that combines four existing technologies in a new way: - Coated particle graphite matrix nuclear fuels (traditionally used for helium cooled reactors). Course Hero, Inc. d) Artificially . Breeder reactors employ liquid metal coolant because it transfers heat from core at a fast rate It has a large specific heat so that it is an efficient heat-transfer fluid. Terms. This is easier to be obtained than uranium 235 because uranium 238 occurs naturally in nature, which is used as fuel in the general nuclear reactor. ⇒ Breeder reactors employ liquid metal coolant because it acts as good moderator produces maximum steam transfers heat from core at a fast rate breeds neutrons ⇒ Fast breeder reactor uses boiler direct cycle of coolant system double circuit system of coolant cycle multi pass system ⇒ Superheated steam is generated in following reactor boiling water gas cooled pressurized water all of … 9. Plutonium-239 fission with fast neutrons produces an average of 3.04 neutrons per fission, more than any other type of fission. 11. Superheated steam is generated in gas cooled reactor. A fast breeder reactor has no moderator. Ans: b 60. Answer & Solution Discuss in Board Save for Later 12. Thus this reactor is important because it breeds fissionable material from fertile material U238 available in large quantities. Ans: b. ADDITIONAL LIQUID METAL REACTORS ... (650°C) fast breeder re-actor utilizing plutonium as the fuel . Ans c 58 Breeder reactors employ liquid metal coolant because it a acts as good, 58. A. acts as good moderator B. produces maximum steam C. transfers heat from core at a fast rate D. breeds neutrons E. increases rate of reaction in core. A fast breeder reactor uses highly enriched fuel i.e. Around 70% of the uranium 238 is used as fuel in breeder reactors. It uses graphite as moderator, metallic uranium, fuel clad in magnesium alloy cans and Co, coolant. Ans: b . This preview shows page 90 - 93 out of 106 pages. Its special features are: (i) Elimination of pressure on reactor and primary circuit due to high boiling point of liquid metal, (ii) Steam generation at high pressure and temperature, Fast breeders do not require moderationsince the neutrons need to be moving fast, whereas thermal breeders make us of moderation to achieve slower-moving neutrons. These two thoughts became the drivers behind the idea of a liquid metal fast breeder reactor (LMFBR). ME430_Fall2018_Assignment_01_solution.pdf, Electrical_Engineering_Objective_Type_by.pdf, University of Cebu - Main Campus • BSME ME415, Air University, Islamabad • ELECTRICAL 1023, Vaageswari College Of Engineering • ECE 04, RRB Mechanical Engineer solved Model paper 2.pdf, Polytechnic University of the Philippines, Mapúa Institute of Technology • MME ME154, Biju Patnaik University of Technology • MECHANICAL 0801222329, Polytechnic University of the Philippines • BSME 101, Copyright © 2020. 12. 58. Ans: c . The plutonium-239 is then bombarded with high-speed neutrons. properties of liquid metal coolants for GEN-IV Sodium, lead, lead-bismuth eutectic (and bismuth) Vitaly Sobolev November 2010 (rev. Under current market conditions, a successful breeder concept will be one that maximizes the owner’s return on investment in the atomic plant as an electrical power production machine. 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. The most promising type of breeder reactor is the Liquid Metal Fast Breeder Reactor (LMFBR), which operates by using liquid sodium as its coolant, and breeds plutonium from uranium-238. 25-1. liquid METAL FUEL GAS-COOLED REACTOR* ... gas coolant because it is inert and has better heat-transfer properties than This preview shows page 71 - 74 out of 441 pages. The steam is used in a direct cycle. (iii) It should not be expensive to fabricate. The power density in a fast breeder reactor is considerably higher than in normal reactors. 9. A liquid metal fast breeder reactor is so named because during conversion of the fertile material into fissile material use is made of high-energy ("fast") neutrons and the coolant employed is sodium, which remains in the liquid state ("liquid metal") at the prevailing high working temperatures. Liquid metal cooling has not been abandoned by the nuclear industry, and I'm not sure where you got the idea that it had. Ans: c. 59. In the breeding of plutonium fuel in breeder reactors, an important concept is the breeding ratio, the amount of fissile plutonium-239 produced compared to the amount of fissionable fuel (like U-235) used to produced it. Breeder reactors employ liquid metal coolant because it. Ans: c 59. It is a, heavy water moderated pressure tube reactor using ordinary water as coolant in the boiling. Solid- fuel for nuclear reactions may be fabricated into various small shapes such, 68. 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