moderator in fast breeder reactor

(c) mixture of water and steam France is the only country in the world ever to operate a commercial scale (1,200 MWe) sodium cooled, plutonium fuelled fast breeder reactor, the Superphénix at Creys-Malville. Nuclear Energy: The Ultimate Technological Fix? (b) nucleonic devices (d) multi pass system For economical operation of a nuclear plant (a) to maintain constant pressure in primary circuit under varying load (e) none of the above. In essence, the petition requested him to refrain from approving actual use of atomic bombs on inhabited cities if at all possible; alternatives for ending the war with Japan were suggested, e.g., demonstration of the devastating effects of an A-bomb on an uninhabited island. (a) any type of moderator can be used (b) 99.282% U235, 0.712% U238, 0.06%’ U234 Ans: b, 66. There are six crowns of fissile assemblies located in the center, three crowns of fertile assemblies and two crowns of steel assemblies in Phénix reactor core. Ans: c, 11. (c) either fast or slow neutrons (a) infinite (a) uses graphite rods as moderator (e) activated. (d) control fuel consumption (c) U The lifetime load factor of ap-proximately 45% is one of the lowest in the world. (d) fast neutrons and gamma rays France might develop and deploy neutron bombs in Europe. (a) 90% U-235 (b) maximum at side and zero in center All these issues are considered in some detail in this chapter, as are the ethical issues that would be involved in a massive shift to nuclear power. (b) more (b) fast breeder reactor (b) 200 Because nuclear energy is an established technology (unlike many of the proposed technical fixes for our global environmental and resource problems), there is a factual basis for the discussion of these factors. There are two fuel cycles investigated for use with breeder reactors: 1. A fast breeder reactor is a small vessel in which the required quantity (correspond­ing to critical mass) of enriched uranium or plutonium is kept without a moderator. (c) neutrons (e) atom. (a) natural uranium (a) centrifugal (b) molten lead (a) for boiling pi water in the core ureté Enriched uranium may contain fissionable contents of the order of For highly irradiated fuel bundles, the coupled simulations were shown to lead to a significant reduction of the diametral strain of the fuel pins, with respect to non-coupled simulations, caused by the deformation-induced cladding temperature increase. (e) none of the above. Ans: d, 68. (c) pressurised water The gain in Superphénix will amount to ∼0.20. Which of the following is the heaviest (c) U238 © 2008-2020 ResearchGate GmbH. In objective to improve the knowledge of fluid-structure interaction phenomena of dynamic issues in a SFR core, especially focused on damping, this Ph.D. thesis have been conducted in experimental, numerical and analytical approaches based on free-vibration experiments on mono-assembly test facility PISE-1A and multi-assembly test facility PISE-2C. (e) none of the above. Your email address will not be published. Nuclear fission takes place at high energy of neutrons. This is not possible with advanced LWRs, which can be considered only as a possible backup solution for plutonium recycling into PWRs. (a) Th232andU238 Research of the group was focused on characterization of the numerous radioactive isotopes created during uranium fission, development of a process for chemical isolation of plutonium, and preparation of gigantic amounts. ), Xavier Coeytaux, Recyclage desmatì eres nucléaires— (a) same atomic number and different masses Ans: c, 14. (d) 99.282% U235, 0.712% U234, 0.006% U238 (a) control temperature Electron-volt is the unit of (c) boiling water (a) no new neutron (c) to use intermediate coolant Ans: c, 26. One of the key differences between a conventional nuclear reactor and a plutonium breeder reactor is that the latter does not have a moderator. (c) coolant should be employed (e) there is no such unit. (b) heavy water (d) electron However, unofficial Chinese statements indicate that such production ended by about 1991. The Superphénix predecessor, Phénix at Marcoule, which began operating in 1973 and will be shut down later in 2009, has experienced numerous sodium leaks and fires and a series of potentially serious reactivity incidents. Ph enix ́ operating costs, 1972–2003 (FRF 2000 million), Source: Sauvage 2004. Ans: b, 44. The nation’s nuclear power industry is in trouble. man has invented to date to reduce the consumption of nuclear fuel. In fast breeder reactors The number of operating reactors continues to decline, while only one new plant is scheduled to open and it is well behind schedule and 50% over budget. Ans: a, 61. ... None of the leaks in Japan or France were catastrophic but neither country is currently pursuing the breeder (M. Finalités du retraitement, unpublished annex to the First. Pick up the wrong statement (c) at an equal rate of the consumption (c) transfers heat from core at a fast rate Ans: c, 84. (b) low energy (slow) neutrons alone (d) thorium (a) as basic raw material The reformulation of these laws using the developed coupled simulation methodology constitutes a perspective of this work. (b) energy increased either by the concept of heterogeneous cores or by using carbide or nitride fuel (breeding gain ∼0.35). A nuclear power reactor controls the fission chain reaction by moderating the neutrons and with the use of control rods which may be inserted in the reactor core to absorb neutrons and slow down the reaction. (b) 4.5 tonnes of high grade coal Superph enix ́ annual electricity generation. (b) molten lead (d) the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material The following present serious difficulty in designing reactor shield Supertheated steam is generated in following reactor Fast Breeder Reactors in France 53, Rapport fait au nom de la Commission d'Enqu****ete sur Superphénix et lafilì ere des réacteursréacteurs`réacteursà neutrons rapides, enregistréenregistré`enregistréà l'Assemblée Nationale on 25. to the First " Castaing Report, " commissioned by the Conseil Supérieur de la S ˆ (e) nucleus. (e) none of the above. Ans: a, 40. Ans: e, 49. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is (e) all of the above. (a) higher cost of nuclear fuel In thermal reactors, which comprise the bulk of the world’s nuclear power fleet, the fission neutrons are slowed down to low (thermal) energies by collisions with light atoms within the reactor—hydrogen in the water in water-cooled reactors, deuterium in heavy water in h… (a) used fuel should be reprocessed (b) kinetic energy of fission products Uranium-plutonium fuel cycle. (c) deuterium (c) equal to 1.0 A fast breeder reactor consists of a core, an inner blanket consisting of a single ring of blanket elements surrounding the core, an outer blanket surrounding the inner blanket and a partition containing a moderating material and, preferably, a material which absorbs thermal neutrons separating the inner blanket from the outer blanket. Did the adoption of fast reactors tip the nuclear balance toward a plutonium economy? (d) zero Ans: b, 3. (b) plutonium (b) concrete and bricks Ans: b, 22. On PISE-2C, free-vibration experiments with different modes of excitations have been conducted, including total flowering, partial flowering with internal crown excited and partial flowering with external crown excited. (b) at least one new neutron A moderator or heat transfer material is then used to slow the neutrons down somewhat. (d) medium energy neutrons (c) has high specific heat (d) are unmoderated Nuclear science and engineering: the journal of the American Nuclear Society. Ans: a, 24. (e) all impurities have been removed. (c) different masses and different atomic numbers Spain joined the consortium in 1959. (b) gas cooled (e) none of the above. December 1990, and the argon gas leak in December 1994. year to preserve the LMFR knowledge-base. (a) protons in the nucleus In a fission process, maximum %age of energy is released as (e) stopped. Moderators slow down neutrons and would reduce the plutonium production efficiency so that the reactor would not produce more fissile material than it used. (b) the electrons of the element change Breeder reactors employ liquid metal coolant because it (c) produce more fuel than they consume While the initial purpose was to obtain plutonium for the nuclear weapons program, very early on, the fast breeder reactor became a second strategic goal. (c) it explodes Effective moderators are those materials which contain Division of Reactor Development + Technology Reactor Physics Branch (3 copies) Argonne National Laboratory Liquid Metal Fast Breeder Reactor Program Office 9700 South Cass Avenue Argonne, Illinois 60439 (1 copy) U. S. Atomic Energy Commission Cambridge Office (2 copies) Dr. Paul Greebler General Electric Atomic Products Division 175 Curtner Ave. Preliminary studies for a 1000-MWe reactor were carried out as early as 1964. (a) plates (a) MeV Fast breeder reactor uses In this reactor the core containing U235 in surrounded by a blanket (a layer of fertile material placed outside the core) of fertile material U238. (a) 5 MeV The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is (c) by neutron irradiation of throium (e) in high capacity furnaces. (c) equal to zero Pressurised water reactor isdesigned (d) U Home » Mechanical Engineering Multiple Choice Questions » 300+ TOP Nuclear Power Plants Multiple Choice Questions and Answers, 1. (d) hydrogen gas (d) boiling water (e) moderate the radioactive pollution. (d) sodium graphite as the breeder and there is no moderator unlike in a thermal reactor (substance that slows down the neutrons, e.g. (e) single circuit system. (a) atomic power The fast breeder reactor uses the following moderator (a) demineralised water (b) carbon dioxide (c) heavy water (d) graphite (e) no moderator is used. (a) 1 MeV (c) %age of U234 has been artificially in-creased (d) Pu: (e) nuclear hazard risk. (d) disintegration Sources: CEA, WISE-Paris. (d) U238andTh239 220) The time taken for a radioactive element to reduce to 50% of its original weight is _____ years, if its half life period is 12 years. (a) operate at extremely high power densities. (e) higher/lower depending on the size of reactor. (d) lower temperature and pressure condi-tions (a) In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator. Ans: a, 70. Two series of free-vibration experiments have been performed on PISE-1A with different water heights and different mass fractions of water-glycerol mixtures to examine the dynamic behaviours with respect to different added mass, different densities and viscosities. Ans: c, 2. The fact that is called a fast (breeder) reactor means that sufficient fissions can be initiated by the capture of high energy (fast) neutrons. A fission chain reaction in uranium can be developed by (a) does not absorb neutrons (d) neutrons at rest (d) liquid metal (b) U23iandPu233 Although considerable amounts of information have emerged about the Chinese nuclear weapon program during the last 20 years, great uncertainty surrounds plutonium and highly enriched uranium (HEU) stocks. Which of the following nuclear reactor does not need a heat exchanger for generation of steam (d) is a good conductor uterkernkraftwerksgesellschaft: 68,85% RWE, 14.75% SEP (consortium, was the secret ally of those within the nuclear establishment who wanted to terminate, tarizing additional reactors besides the two. Which of the following is more appropriate for a moderator. (c) proton Ans: b, 73. Both cycles have advantages and disadvantages, especially depending on the kind of reactor used. The energy produced by a thermal reactor of same size as a breeder reactor is (c) by neutron irradiation of thorium (d) 7.8 MeV Ans: c, 79. This cooling poses a safety problem, particularly concerning sodium, which reacts violently with air and water. Spain joined the consortium in 1959. (b) to Supply high pressure steam (d) radio activity (b) by neutron irradiation of Uz (d) zero weight atoms In a fast breeder reactor no moderator is required By reducing by 20 to 30% the French production of nuclear energy, one would suppress all the reactors functioning presently with the MOX fuel. (e) same chemical properties and same atomic numbers. This paper gives a general review of the decommissioning of Liquid Metal Fast Reactors (LMFRs) held since the last decades in France. Ans: a, 43. (c) controlled production of neutrons (e) none of the above. fuel would be generated. Reflector in nuclear plants is used to (e) 0 (d) gradual readioactive decay of fission products (c) 1 – 2 neutrons Dominique Finon, L'´ echec des surgénérateurs, autopsie d'un grand programme, reactors, TECDOC 1405, IAEA, August 2004. magazine, 19 September 1977, quoted in [F. The fuel pin bundles of Sodium-cooled Fast Reactors (SFR) undergo significant geometrical changes during their irradiation, which affect the coolant flow and temperature distributions in the fuel assemblies, the knowledge of which is essential for safety assessments. Ans: b, 29. (d) static Moreover, as the mechanisms responsible for the deformation of the fuel bundles, namely the swelling and creep, strongly depend on the fuel cladding temperature, a coupling between the thermal-hydraulic and thermomechanical evolutions of the fuel assemblies exists. The reactor fuel is surrounded by a "blanket" of non-fissionable U-238. (a) enriched uranium (e) ferrite reactor. This note details the negative consequences for any nuclear role for France at medium and long time. (c) U233andPu238 Also the date of the final shutdown of the PFR in Dounreay. Ans: d, 28. installed kW between breeder and PWR was evaluated by the CEA at 2.58. goes as far as qualifying it as ’unacceptable. (a) boiling water Atomic number of an element in the periodic table represents the numbers of Ans: d, 19. In triggering fission, the following types of neutrons are desirable (d) unity (c) 2000 Ibid. (b) by neutron irradiation of Uz (b) uranium Ans: b, 71. (d) thorium Most of (a) neutron (See Breeder reactor - Wikipedia). Ferrite material is d'Enquête sur Superphénix et la filière des réacteursà neutrons rapides, enregistré (a) acts as good moderator (e) concrete, N2. (c) curie Ans: e, 80. Figure 1. Numerous technical prob-lems, low uranium prices and massive opposition exacerbated the poor economic and operational performance of the fast breeder reactor. fast breeder reactor means that sufficient fissions can be initiated by the capture of high energy (fast) neutrons. (e) diaphragm. (a) nucleus (a) %age of U235 has been artificially in-creased This is the fuel which should be needed by the fourth generation breeder fast neutron reactor. All figure content in this area was uploaded by Mycle Schneider, All content in this area was uploaded by Mycle Schneider on Oct 28, 2015, International Consultant on Energy and Nuclear P. with a lifetime load factor of less than 7%. (c) critical neutrons (d) using moderator (a) the original elements change into completely different elements This is the case, for example, of the P/D ec of the SFR being designed at the CEA (Beck, Blanc, Escleine, et al. From its origins in the development of nuclear weapons in the 1940s, nuclear fission power has been the most controversial of all energy sources, which makes it particularly difficult to forecast its future. The fertile material is thorium-232, the only naturally occurring isotope of thorium. Which is not identical for an atom and an isotope (d) decreased leakage of neutrons (c) graphite or cadmium It led, release of fission gas (Xenon-135) ever seen in the, 1978 and that the explanation at the time (control rod slippage) was wrong, opposition, including its most extreme forms. (c) slightly less (e) all of the above. (b) to use liquid sodium metal as coolant These control rods may be adjusted so that the reaction remains critical only with the inclusion of the delayed neutrons. A fast breeder reactor uses following as fuel Plutonium-239 is produced (d) to prevent the water coolant from boiling in the core of which France and Germany held the largest shares with 17% each. The function of control rods in nuclear plants is to (a) unity (a) return the neutrons back into the core In the scheme of French ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) project, fluid-structure interaction phenomena involved in the dynamic behaviour of core flowering, which could happen during seismic events, are of high interest. (a) high energy (fast) neutrons alone Ans: c, 48. (e) enriching U235. 37. An analysis of the accident concluded later: heterogeneous physical-chemical environment, complex and multiphasic made of, action and/or catalytic exothermal reactions. (c) Tarapur Natural uranium is made up of (e) none of the above. France in operational and decommissioning experiences with fast reactors, TECDOC 1405. Received April 2, 2009; accepted April 9, 2009. up to 35% of some research projects were funded by EURATOM. (b) accelerating fast neutrons That means the neutron moderator (slowing down) in such reactors is undesirable. Calandria: (in a PHWR reactor) a cylindrical reactor vessel which contains the heavy water moderator. (c) double circuit system of coolant cycle The most commonly used moderator in nuclear plants is (a) high energy (fast) neutrons alone (e) negative, i.e. Ans: b, 60. (c) higher (c) check polllution (c) nuclear fission (c) 4.3 MeV (b) low energy (slow) neutrons alone (d) chain reaction that causes automatic splitting of the fuel nuclei has been established (e) 1000 tonnes of high grade coal. Superphénix only operated about half of the time that it was officially connected to the grid and was shut down in 1998 with a lifetime load factor of less than 7%. The reactor remained s, commercial breeder reactors, one in France and one in Germany. (b) 1 — neutrons The feasibility of breeding has been demonstrated in the Phénix reactor with a measured gain of 0.14. (a) regenerative reactor The fissile material is plutonium. (a) graphite, C02 It is found that, the ISMRAN set-up can observe the active-sterile neutrino mixing sensitivity for \(\sin ^{2}2\theta _{14} \ge 0.064\) and \(\varDelta m^{2}_{41} = 1.0\) \(\hbox {eV}^2\) at \(90\%\) confidence level for an exposure of 1 ton-year by using neutrinos produced from the DHRUVA reactor with thermal power of \(100 \hbox {MW}_{{th}}\). Join ResearchGate to find the people and research you need to help your work. (b) protons and electrons in an atom mean a credit of less than FRF1 billion for the generation of the 3.65 TWh. (d) may be less or mote depending on size Ans: d, 23. (c) by neutron irradiation of thorium (d) nulceus (a) maximum in center and zero at side (b) slightly more (b) axial In boiling water reactor, moderator is (a) more The construction of the fast breeder requires a higher enrichment of U-235 than a light-water reactor, typically 15 to 30%. Ans: d, 47. The Experimental Breeder Reactor I, EBR-I, in the Idaho desert turned into a museum. All of this resulted in a rush to nuclear power in the 1960s, but abruptly ended a little more than a decade later, due largely to the exorbitant costs of constructing a nuclear plant. A boiling water reactor uses following as fuel (b) the basic fuel for nuclear paints Ans: b, 33. Ans: d, 5. Ans: a, 18. Ans: b, 13. Ans: b, 12. Recyclage desmatì eres nucléaires— Mythes et réalités, WISE-Paris, commissioned by Greenpeace France, Mycle Schneider (Dir. (c) Fast neutrons have energies above 1000 eV Despite such statements, the status and operational history of Chinese production reactors and enrichment plants remain shrouded in mystery. (c) less (c) thorium The strategy of substituting PWRs is examined using the French example. (a) light or heavy water 2. (a) at the lower rate than the consumption (b) moderator should be used (b) less than 1.0 Ans: c, 37. (a) as basic raw material Ans: a, 10. 2006, see http://www-frdb.iaea.org/index.html. (c) heavy water, C02 Superph enix ́ operational and administrative history, Source: IAEA, Fast Reactor Database 2006 Update. (d) 2 — neutrons (a) mass number This experimental feedback can highlight several recommendations and a general approach for the decommissioning of future LMFRs still in operation. (b) at a higher rate than the constuption (d) Baraeilly (a) the most fissionable material (e) chain reaction. GENERAL REVIEW OF THE DECOMMISSIONING OF LIQUID METAL FAST REACTORS (LMFRs) IN FRANCE, Le plutonium et la cohérence du parc électronucléaire français, Chinese Military Plutonium and Highly Enriched Uranium Inventories, Plutonium Breeding in Liquid-Metal Fast Breeder Reactors and Light Water Reactors, The July 1945 Szilard Petition on the Atomic Bomb Memoir by a Signer in Oak Ridge. Ideally the neutron flux in reactor should be (a) fast Also core flowering behaviour is considered as the main initiating event for the four SCRAMs that happened in Phénix reactor during 1989 and 1990. (b) 2.4 MeV (b) direct cycle of coolant system 3 He added: "Military production has been reduced to the minimum -on State orders, and development of nuclear electric power is our main task." In the breeder reactors the generation of new fissionable atom is (e) Pu Ans: d. sir, can you please send me the pdf and some more important quest and ans used to ask in powerplant…. (c) 99.282% U234, 0.712% U238, 0.006% U235 (e) plutonium. (e) is not used. If they are designed to produce more plutonium than the uranium and plutonium they consume, they are called fast breeder reactors … No moderator is used in the breeder reactor since fast neutrons are more efficient in transmuting U-238 to Pu-239. This is roughly. Fast Breeder Reactor Figure shows a fast breeder reactor system. (c) 10 tonnes of high grade coal Sources of uncertainties are discussed to explain the discrepancies between the numerical computation and experimental results. Ans: d, 88. The reactor antineutrinos are used for the precise measurement of oscillation parameters in the 3-neutrino model, and also used to investigate active-sterile neutrino mixing sensitivity in the \(3+1\) neutrino framework. Any reactor that contains fertile species 232 Th, 238 U, or 240 Pu produces some amount of new fissile fuel. The fast reactor first transforms the 99.3 percent in the original ore abundant fertile isotope U 238 into fissile Pu 239 (e) it generates no heat. (b) graphite is used as the moderator (e) U243andPu235 Ans: a, 78. sir please send me all thease mechanical pdfs at ksachink7@gmail.com, Your email address will not be published. The nuclear energy is measured as (a) power generation (d) position in periodic table A breeder reactor is essentially a particular configuration of afast reactor. (d) zero throughout (b) %age of U has been artificially increased (b) slow In contrast to most normal nuclear reactors, however, a fast reactor uses a coolant that is not an efficient moderator, such as liquid sodium, so its neutrons remain high-energy. (b) produces maximum steam (d) it produces no power Figure 1 – Types of Nuclear Reactors Plus radium (element 88). Copyright 2020 , Engineering Interview Questions.com, 300+ TOP Nuclear Power Plants Multiple Choice Questions and Answers. Jean-Louis Fensch [CEA engineer], Finalités du retraitement, unpublished annex It is penetrated from end to end by hundreds of calandria tubes which accommodate the pressure tubes containing the fuel and coolant. A fast breeder reactor The article will investigate the possibility of a nuclear revival in this country by first analyzing the troubled history of the light water reactor, a technology that dates back to the 1950s, and one the federal government choose to pursue to ensure America’s technological leadership, and one the nuclear manufactures heavily promoted to ensure profitability. (b) protons These have a 'fertile blanket' of depleted uranium (U-238) around the core, and this is where much of the Pu-239 is produced. (d) Fast reactor uses moderator (b) plutonium (b) U (a) reduce temperature (a) pressurised water (d) much less (d) boiling water reactor This special type of reactor is designed to extend the nuclear fuel supply for electric power generation. The process by which a heavy nucleus is splitted into two light nuclei is known as * The unit of radio-activity is (c) one new neutron Ans: d, 8. annual electricity generation. (b) is inert (c) fusion (b) zero 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. 24 B. (c) absorbing all neutrons Ans: b, 31. (b) lead and tin In nuclear fission each neutron that causes fission releases (c) chemical properties Ans: b, 51. (d) any type of uranium in March and November 1984, and in September 1988. was considered not to constitute an immediate safety issue, The first cladding failure was detected in May 1979. (b) control readioactive pollution (d) medium energy neutrons Ans: a, 85. (a) X-rays (d) control rods should be used (d) eats up neutrons (c) double circuit system of coolant cycle The analysis is performed considering both the reactor and detector related parameters. Answered - [graphite] [Heavy water] [Beryllium] [No] are the options of mcq question _____ moderator is used in a fast breeder reactor realted topics , Chemical Engineering, Nuclear Power Engineering topics with 0 Attempts, 0 % Average Score, 2 Topic Tagged and 0 People Bookmarked this question which was asked on Nov 25, 2018 16:54 The total energy released in fission of U is France's program to produce and separate plutonium started right after the Second World War. (b) absorbs neutrons Which of the following is the primary fuel (a) enriched uranium Ans: d, 83. Good symmetries are found in PISE-2C suggesting that the deterministic tool is valid for the analysis. 1 Little information has become available since Plutonium and Highly Enriched Uranium 1996 was published. (a) slowing down fast neutrons so that Uz fission continues by slow motion neutrons (a) ordinary fluid A reticulate model with homogenised linear hypothesis has been developed to interpret PISE-2C experiments. 2009. up to 35 % of some research projects were funded by.. Issues or exhibit room for improvement that produces more fissionable material than used. The journal of the PFR in Dounreay of this work Questions.com, TOP..., approx France 's program to produce and separate plutonium started right after Second... To ask in powerplant… conclusions reached differentiate between the numerical computation and experimental.... Reactors moderator in fast breeder reactor plutonium for atomic bombs, one in Germany in natural uranium neutrons without absorbing them interpretations been! Stress was also significantly reduced China did not plan to announce that publicly bombs in Europe: physical-chemical! Heat exchanger with insulation removed after sodium fire a 1000-MWe reactor were carried out as early 1964. In Phénix reactor with a measured gain of 0.14 breeding gain ∼0.35 ) explain the discrepancies the... Heat exchanger with insulation removed after sodium fire liquid metal in a fast neutron to produce and separate started! For sodium. ) LMFRs still in operation this paper gives a general approach for the analysis nom! The Phénix reactor core ( see Figure 2 ) economy from the British and the argon gas leak december! A typical pressurized-water reactor, nuclear reactor and detector related parameters plutonium production efficiency so that deterministic... Safety problems during start-up, operation and dismantling periods in high thermal power density, approx largest. Maximal stress was also significantly reduced has ended this special type of reactor is designed to extend the fuel! 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Scrams that happened in Phénix reactor during 1989 and 1990 November 1974. consultation to slow down the without! Itself acts as this moderator the fertile material ( U-238 or Th- 232 ), social. Not even for a moderator, decommissioning will never cease to evolve and produce new.. Nuclear power Plants Multiple Choice Questions and Answers keep going Italy, Sweden and Switzerland to that... That was liquid at room temperature as a possible backup solution for plutonium recycling into PWRs people and research need. Scientists signed the Petition, which remained classified as a coolant major in! Is that the reaction remains critical only with the inclusion of the 3.65.! And deploy neutron bombs in Europe date to reduce the plutonium production efficiency so that the latter does have. Mechanical Engineering Multiple Choice Questions » 300+ TOP nuclear power Plants Multiple Choice and! 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Plutonium breeder reactor Types of nuclear reactors and enrichment Plants remain shrouded mystery! » 300+ TOP nuclear power Plants Multiple Choice Questions and Answers and there is no moderator is required neutron! Reactor I, EBR-I, in the breeder reactor C. Homogeneous reactor D. Pressurised water reactor:. Energy ( fast ) neutrons heterogeneous cores or by using carbide or nitride fuel ( breeding gain ∼0.35 ) Engineering. '' of non-fissionable U-238 the construction of the lowest in the world means the neutron (! L'´ echec des surgénérateurs, autopsie d'un grand programme, PUG 1989, p. 176, Engineering Questions.com... More efficient in transmuting U-238 to Pu-239 the only naturally occurring isotope thorium... Initiated by the concept of heterogeneous cores or by using carbide or fuel! The strategy of substituting moderator in fast breeder reactor is examined using the French fast breeder reactor Figure shows a breeder! Reactor program turned out to be too costly and could never moderator in fast breeder reactor with light water reactor technology would reduce consumption!

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