# moderator in fast breeder reactor

Most of (a) as basic raw material (b) ferrite rod Fast breeder reactor C. Homogeneous reactor D. Pressurised water reactor ANS:- B. Fast neutron reactors use mainly plutonium as nuclear fuel. mean a credit of less than FRF1 billion for the generation of the 3.65 TWh. (d) artificially 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%. (b) accelerating fast neutrons Enriched uranium may contain fissionable contents of the order of (b) direct cycle of coolant system (b) by neutron irradiation of Uz A fission chain reaction in uranium can be developed by (b) boiling water (c) heavy water Nucléaire, October 1982. (e) all impurities have been removed. Ans: a, 6. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. (b) maximum at side and zero in center (c) U-235 (a) slowing down fast neutrons so that Uz fission continues by slow motion neutrons The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is (c) the molecules rearrange themselves to form other molecules This cooling poses a safety problem, particularly concerning sodium, which reacts violently with air and water. (e) increases rate of reaction in core. (b) enriched uranium (d) cause collision with the fast moving neutrons to reduce their speed (e) moderate the radioactive pollution. (b) lead and tin Ans: d, 7. Ans: a, 43. (d) thick galvanised sheets (e) unpredictable. Ans: c, 58. (a) the original elements change into completely different elements (d) fast neutrons and gamma rays (e) atom. Ans: d, 8. (b) U (c) breeder reactor Ans: c, 48. The fast reactor first transforms the 99.3 percent in the original ore abundant fertile isotope U 238 into fissile Pu 239 (a) boiling water (c) chemical properties Breeder reactors producing uranium 233 out of thorium can breed with thermal neutrons and do use moderators. Ans: d, 83. (d) graphite (e) none of the above. a month from 9 October to 8 November 1974. consultation to slow them down; the latter can be qualiﬁed as minimal. The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be (b) atomic number In this conservative approach, the thermal-hydraulic simulations are conducted without considering the geometrical deformation, and the resulting temperature distributions are used as input for the thermomechanical simulations. (c) control the reaction Also the date of the final shutdown of the PFR in Dounreay. (a) Co2 (c) U235andPu235 (d) liquid metal cooled (d) multi pass system Unlike the other declared nuclear weapon states, China has yet to officially state that its production of fissile materials for weapons has ended. (d) thorium (c) critical neutrons (b) U-238 (d) using moderator Which of the following can be used as a coolant in nuclear plant Ans: c, 39. (a) maximum in center and zero at side (e) 2 x 105. The fissionable fuel core is surrounded by a blanket of fertile material (U-238 or Th- 232). (a) splitting (c) %age of U234 has been artificially in-creased (b) beta particles He further indicated that China did not plan to announce that publicly. Unfortunately, these objectives had to be limited to a conversion ratio of 0.9 for safety reasons, and it is not certain whether operation will be rewarding economically. (b) control readioactive pollution In addition, the thermal-hydraulic boundary conditions used in the CFD simulations, such as the sodium mass flow rate through the bundle, are also automatically adjusted to account for the deformation.Study cases consisting of bundles of 7 and 19 wire-wrapped fuel pins, with geometrical characteristics and boundary conditions representative of fourth generation SFRs, were analyzed in order to gain insight on the effects of the coupling. Cooling is achieved with sodium or with molten lead. (a) fast (c) reciprocation (e) blanket of thorium. (a) does not absorb neutrons Ans: d, 19. The size of the reactor is said to be critical when Ans: a, 4. This special type of reactor is designed to extend the nuclear fuel supply for electric power generation. The main interest of shielding in nuclear reactor is protection against A fast breeder reactor 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. Boiling water reactor employs Ans: b, 3. A boiling water reactor uses following as fuel This is the fuel which should be needed by the fourth generation breeder fast neutron reactor. (a) enriched uranium 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. (a) kinetic energy of neutrons 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. (b) concrete and bricks Driving forces will be the development of parallel industries (e.g. (b) heavy weight atoms Fast Breeder Reactors in France 53, Rapport fait au nom de la Commission d'Enqu****ete sur Superphénix et lafilì ere des réacteursréacteursréacteursà neutrons rapides, enregistréenregistréenregistréà l'Assemblée Nationale on 25. (e) reflector should be used. Ans: a, 20. fuel would be generated. (b) kinetic energy of fission products Additionally, neutronic simulations were conducted in order to verify that, in nominal operational conditions, its coupling with thermal-hydraulics and thermomechanics is of minor importance. The presence of reflector in nuclear power plants results in (c) graphite or cadmium (d) 99.282% U235, 0.712% U234, 0.006% U238 (a) In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator. Ans: a, 85. (a) used fuel should be reprocessed (d) multi pass system (a) graphite, C02 (b) low energy (slow) neutrons alone (c) thermal neutrons (d) Pu: A. (e) negative, i.e. The fast reactor has no moderator and relies on fast neutrons alone to cause fission, which for uranium is less efficient than using slow neutrons. (d) neutrons and gamma rays However, unofficial Chinese statements indicate that such production ended by about 1991. (a) X-rays Ans: a, 40. Lez Durance Cedex, France in operational and decommissioning experiences with fast Breeder reactor, nuclear reactor that produces more fissionable material than it consumes to generate energy. (a) plates (c) slightly less U238 will undergo fission by In a fast breeder reactor no moderator is required. (d) initiated (b) axial (c) 3 One of the key differences between a conventional nuclear reactor and a plutonium breeder reactor is that the latter does not have a moderator. Nuclear Energy: The Ultimate Technological Fix? (d) radio activity These have a 'fertile blanket' of depleted uranium (U-238) around the core, and this is where much of the Pu-239 is produced. reactors, TECDOC 1405, IAEA, August 2004. Operational History of France’s Ph enix ́ breeder reactor, 1974–2002 (Na is the chemical symbol for sodium.). (a) 5 MeV (b) 10 MeV (a) increased production of neutrons (c) U238andPu239 (b) graphite is used as the moderator upgrades between 1997 and 2003 (see Figure 5). (b) high initial cost Ans: b, 60. This furthermore conveys how the usage of plutonium made criticism of nuclear power both systematic and inclusive by tying together technological, political, and social risks and establishing a common bond between anti-breeder policies and environmental concerns. heavy water). (c) 1 – 2 neutrons (a) lead or concrete (a) natural uranium 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. 2. (b) pallets Thorium-uranium fuel cycle. (d) static Ans: a, 41. Edge effects are not found to have an important impact on the dynamic behaviours of the system. (b) to use liquid sodium metal as coolant electronics, robotics), new social expectations, political priorities, and cost constraints making a virtue of necessity. (b) fast breeder reactor These control rods may be adjusted so that the reaction remains critical only with the inclusion of the delayed neutrons. A reactor capable of converting a ferrite material into fissile isotopes is called (d) electrons in the atom (b) Slow or thermal neutrons have energy of the order or 0.025 eV Ans: a, 6. Numerous technical prob-lems, low uranium prices and massive opposition exacerbated the poor economic and operational performance of the fast breeder reactor. Figure 1. (e) there is no such unit. Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal (d) MeV (b) 1-25% (c) uniform throughout One which International Panel on Fissile Materials, Princeton University. 37. (c) to use intermediate coolant If they are designed to produce more plutonium than the uranium and plutonium they consume, they are called fast breeder reactors â¦ No moderator is used in the breeder reactor since fast neutrons are more efficient in transmuting U-238 to Pu-239. 1 Little information has become available since Plutonium and Highly Enriched Uranium 1996 was published. One gram of uranium will produce energy equivalent to approximately (b) infra-red rays The reactor remained s, commercial breeder reactors, one in France and one in Germany. (d) unity European cooperation was another goal and the EURO-CHEMIC consortium was created in 1957 with the participation of 10 countries of which France and Germany held the largest shares with 17% each. Ans: d, 87. (e) all of the above. 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. (e) use water as coolant. (e) nucleus. (e) AMU. Hague facilities separated about 17 tons of plutonium in 1997. Ans: c, 84. Breeder reactor has a conversion ratio of A fast neutron reactor is a nuclear reactor in which the fission chain reaction is sustained by fast neutrons. Which is not identical for an atom and an isotope ... 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. Which of the following is the primary fuel (c) either fast or slow neutrons equivalent of one reactor core (see Figure 2). Jean-Louis Fensch [CEA engineer], Finalités du retraitement, unpublished annex (c) deuterium (c) has high specific heat Conventional reactors use uranium as fuel and produce some plutonium. (a) greater than 1.0 (a) fast moving (c) equal to zero (b) carbon dioxide Ph enix ́ operating costs, 1972–2003 (FRF 2000 million), Source: Sauvage 2004. Electron-volt is the unit of (e) none of the above. (d) 168 MeV (d) U R&D LMFRs Knowledge Preservation French Project, CEA, Saint-Paul-Lez Durance Cedex, France in operational and decommissioning experiences with fast reactors. (a) 20 It is also observed that, there is a significant improvement of the active-sterile neutrino mixing parameter $$\sin ^{2}2\theta _{14}$$ to $$\sim$$ 0.03 at the same $$\varDelta m^{2}_{41}$$ by putting the ISMRAN detector set-up at a distance of 20 m from the compact proto-type fast breeder reactor facility with thermal power of 1250 $$\hbox {MW}_{{th}}$$. The Experimental Breeder Reactor I, EBR-I, in the Idaho desert turned into a museum. (d) electromagnetic Pressurised water reactor isdesigned (b) gas cooled (c) pure uranium Ans: c, 86. (e) Pu Ferrite material is (a) is lighter (b) zero (c) same (a) protons in the nucleus (d) artificially (a) nucleus (d) 20,000 (b) to Supply high pressure steam 36. (c) a, P, and y rays (b) 2.4 MeV (b) proton Ans: a, 18. (e) decrease of speed of neutrons. (c) by neutron irradiation of thorium In this reactor no moderator is used. Ans: e, 80. (d) liquid sodium metal (e) graphite. (c) accelerates neutrons R. Galley, C. Bataille, Rapport fait au nom de la Commission d'Enqu****ete sur Ans: d, 21. Ans: a, 69. Any reactor that contains fertile species 232 Th, 238 U, or 240 Pu produces some amount of new fissile fuel. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as PUG 1989, p. 176. Ans: d, 47. 500kW l-1 or more5, requiring efficient cooling medium. A. Candu reactor B. campaign. Ans: d, 88. Amongst the following, the fissionable materials are A breeder reactor is essentially a particular configuration of afast reactor. (b) electron 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. 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. (c) exactly balanced by the loss of neutrons through leakage (d) all of the above There are two categories of breeder reactors, based on the speed of the neutrons. The article then discusses the chances of a nuclear comeback, focusing on new reactor designs, which are less complex and cheaper to construct but will be dependent upon how seriously global warming is viewed by the public and elected officials. Ans: a, 61. Access scientific knowledge from anywhere. (c) basic raw material for nuclear plants Join ResearchGate to find the people and research you need to help your work. Good symmetries are found in PISE-2C suggesting that the deterministic tool is valid for the analysis. (c) it explodes (e) equal to infinity. (d) hydrogen gas (a) coolant itself Ans: b, 46. (b) pressurised water Ans: a, 36. (c) 10 tonnes of high grade coal (c) by neutron irradiation of throium ´ echec des surgénérateurs, autopsie d'un grand programme. The following present serious difficulty in designing reactor shield Ans: a, 55. (a) higher cost of nuclear fuel (c) neutrons (a) no new neutron Received April 2, 2009; accepted April 9, 2009. up to 35% of some research projects were funded by EURATOM. The coolant used in boiling water reactor is Ans: c, 2. (e) moderator is dispensed with. (d) electron (c) neutrons in the nucleus Breeder reactors actually produce more â¦ (d) eats up neutrons (e) U-239. (d) the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material The most commonly used moderator in nuclear plants is (c) controlled production of neutrons (e) many-fold neutrons. The reformulation of these laws using the developed coupled simulation methodology constitutes a perspective of this work. All rights reserved. (a) fast breeder Uranium-233 is produced Nuclear science and engineering: the journal of the American Nuclear Society. (d) zero (e) kWhr. Required fields are marked *. (b) molten lead The reactor fuel is surrounded by a "blanket" of non-fissionable U-238. It summarizes the main steps to process the decommissioning of RAPSODIE and SUPERPHÉNIX. Ans: a, 70. Which of the following is more appropriate for a moderator. Ans: b, 66. 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. Most of these countries had nuclear weapons programs or ambitions at some point. (d) uses ferrite material as moderator (e) none of the above. 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. (e) it produces tremendous power. Plutonium-239 is produced (c) graphite rod In fast breeder reactors a) Any type of moderator can be used b) Graphite is used as the moderator c) Heavy water is used as the moderator d) Moderator is dispensed with ... A fast-breeder nuclear reactor produces more fuel than it consumes, while generating energy. Ans: c, 42. (c) 99.282% U234, 0.712% U238, 0.006% U235 (e) single circuit system. The function of control rods in nuclear plants is to Ans: c, 11. safety problems during start-up, operation and dismantling periods. (b) slightly more * Corresponding numerical interpretations have been conducted with 3D Navier-Stokes model in CAST3M code. Ans: d, 68. (c) voltage (a) same Ans: b, 53. In 1994, for example, Jiang Xinxiong, then-general manager of the China National Nuclear Corporation, said that "most of the nuclear factories are closed or have stopped operation." (c) pins (e) none of the above. Did the adoption of fast reactors tip the nuclear balance toward a plutonium economy? Ans: b, 32. The unit of radio-activity is The fertile material is uranium-238, the major isotope in natural uranium. But like any other industry, decommissioning will never cease to evolve and produce new achievements. 219) Which of the following may not need a moderator? (a) natural uranium Ans: d, 5. Ans: b, 89. The risk of radioactive hazard is greatest in the turbine with following reactor (c) carbon dioxide (c) there is danger of nuclear spread Chinese officials have stated for almost two decades that operations at its military nuclear production facilities were being scaled back in order to concentrate on civilian nuclear power. This is not possible with advanced LWRs, which can be considered only as a possible backup solution for plutonium recycling into PWRs. Ans: d, 16. Moderators are used to slow down the neutrons without absorbing them. (c) Tarapur The energy required to be applied to a radioactive nucleus for the emission of a neutron is (d) medium energy neutrons (e) enriching U235. (d) protons and neutrons in a nucleus Ans: b, 12. This paper gives a general review of the decommissioning of Liquid Metal Fast Reactors (LMFRs) held since the last decades in France. to the First " Castaing Report, " commissioned by the Conseil Supérieur de la S ˆ (a) plutonium (e) carbon tetrachloride. The process by which a heavy nucleus is splitted into two light nuclei is known as (e) uses pressurised water as moderator. Fast breeder reactors which use uranium-238 as fuel and thermal breeder reactors which use thorium-232 as fuel. (a) infinite Ans: d. sir, can you please send me the pdf and some more important quest and ans used to ask in powerplant…. Enriched uranium is one in which Ans: e, 9. Issues of New Technological Trends in Nuclear Power Plant (NPPs) for Standardized Breakdown Structure, Development of a thermal-hydraulics/thermomechanics coupling model for the evaluation of the behavior of SFR fuel assemblies under irradiation, Analysis of fluid-structure interaction in a sodium fast reactor core : experimental, theoretical and numerical evaluation of damping and frequencies, Reckless Proliferation and Guardianship Proliferation: The Fast Breeder Nuclear Reactor and the Plutonium Economy, Sensitivity to sterile neutrino mixing using reactor antineutrinos. (a) electrons (a) gas cooled France's program to produce and separate plutonium started right after the Second World War. (d) may be less or mote depending on size Ans: a, 56. Which of the following particles is the lightest (e) to eliminate the coolant loop of the pressurised water. and discharge fuel from the reactor core. 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. (d) meson Ans: b, 51. proximately 45% is one of the lowest in the world. (b) direct cycle of coolant system (b) U233andPu239 (d) 1-75% (a) pressurised water Spain joined the consortium in 1959. (b) liquid metal cooled The lifetime load factor of ap-proximately 45% is one of the lowest in the world. (c) thorium (d) zero throughout (e) mercury. turned it into 180 cubic meters of concentrated sodium hydroxide. 3 He added: "Military production has been reduced to the minimum -on State orders, and development of nuclear electric power is our main task." Ans: d, 76. (a) the most fissionable material (d) any one of the above (d) there is no such criterion The fast breeder reactor uses the following moderator (a) demineralised water (b) carbon dioxide (c) heavy water (d) graphite (e) no moderator is used. (d) medium energy neutrons Ans: e, 27. Natural uranium is made up of Fast breeder reactor uses (e) nuclear hazard risk. (c) thorium 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. Reactors designed for propulsion applications are designed for (e) in high capacity furnaces. Ans: d, 28. (b) same chemical properties but different atomic numbers (b) heavy water (c) U233andPu238 Supertheated steam is generated in following reactor Superphénix et lafilì ere des réacteursréacteursréacteursà neutrons rapides, enregistréenregistréenregistréà l'Assemblée The objective of this thesis is to define a new methodology for the evaluation of the behavior of SFR fuel bundles under irradiation that considers the coupling between their thermal-hydraulic and thermomechanical evolutions.To this end, a new numerical coupling has been developed between the industrial Computational Fluid Dynamics (CFD) code STAR-CCM+ and DOMAJEUR2, a finite element code dedicated to the modeling of the thermomechanical behavior of SFR fuel assemblies under irradiation. Ans: a, 10. Liquid metal (a) power generation (a) 1 Ans: a, 38. (a) uses graphite rods as moderator Source: IAEA, Fast Reactor Database 2006 Update. Unlike the novel approach developed in this work, the preexisting simulation tool employs a simplified thermal-hydraulic model and does not consider the impact of the deformation on the coolant mass flow rate, which was found to be of major importance. In a fission process, maximum %age of energy is released as (a) same (b) graphite, air (b) electron-ampere (e) 11 MeV. (a) as basic raw material (d) neutrons at rest France might develop and deploy neutron bombs in Europe. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is This memoir describes activities in Oak Ridge and documents the history of the ill-fated secret Szilard Petition addressed to President Truman. (d) boiling water (e) none of the above. (b) moderator should be used A pressurised water reactor employs pressuriser for the following application Which of the following nuclear reactor does not need a heat exchanger for generation of steam (a) Kota In a fast breeder reactor no moderator is required (e) in high capacity furnaces. (b) curie © 2008-2020 ResearchGate GmbH. Ans: e, 82. (a) for boiling pi water in the core The so-called $$3+1$$ scenario is considered for active-sterile neutrino mixing, which leads to projected exclusion curves in the sterile neutrino mass and mixing angle plane. Ans: b, 44. 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%. (b) the basic fuel for nuclear paints (a) 1 MeV (b) plutonium Controversy has embroiled all aspects of nuclear power: the safety of reactors, the extent of uranium resources, the effects on health of low levels of ionising radiation, the likelihood of nuclear weapons proliferation, and the effectiveness of various nuclear waste disposal methods. In a typical pressurized-water reactor, the water itself acts as this moderator. The fast breeder reactor uses the following moderator (a) demineralised water (b) carbon dioxide (c) heavy water (d) graphite (e) no moderator is used. Half life of a radioactive isotope corresponds to the time required for half of the following to decay Hence a fast reactor usually uses plutonium as its basic fuel, since it fissions sufficiently with fast neutrons to keep going. A nuclear fission produces energy of following order in MeV (a) electron-volt (c) U (b) uranium (c) proton 2000. (b) energy Fast Breeder Reactor Figure shows a fast breeder reactor system. (e) black carbon papers. Your email address will not be published. (e) it generates no heat. In nuclear fission each neutron that causes fission releases (a) at the lower rate than the consumption (c) heavy water, C02 (c) double circuit system of coolant cycle (d) any type of uranium In this way the breeder reactor can produce both energy and more fuel. Since they do not require any moderator, their core is 10 times more compact than those of conventional civilian reactors. As Argonne explains it, when an atom in a nuclear reactor âfissionsââor splits into several smaller fragmentsâneutrons are released at high energy (fast speeds). (d) depends on other considerations In the past, this coupling has been neglected, and a more conservative approach has been preferred. (c) double circuit system of coolant cycle Recently, the old idea of breeding in advanced pressurized water reactors (PWRs) has been taken up again with the objective of attaining a gain of 0.05. (e) natural uranium. (b) shield the radioactivity completely (c) higher Ans: d, 52. 1 The first reprocessing plant, the "plutonium factory" (usine de plutonium) UP1 was started up in Marcoule in 1958 and the first proposal for the experi-mental fast reactor Rapsodie was drawn up that year. (a) light weight atoms (d) MW Superph enix ́ annual electricity generation. Ans: c, 50. (b) the electrons of the element change fast breeder reactor means that sufficient fissions can be initiated by the capture of high energy (fast) neutrons. Ph enix ́ heat exchanger with insulation removed after sodium fire. (d) more than one new neutrons It is penetrated from end to end by hundreds of calandria tubes which accommodate the pressure tubes containing the fuel and coolant. In the present work, we study the feasibility of sterile neutrino search with the indian scintillator matrix for reactor anti-neutrino (ISMRAN) experimental set-up using electron antineutrinos ($${\overline{\nu }}_e$$) produced from reactor as a source. U235 will undergo fission by (b) extract heat from nuclear reaction A nuclear unit becoming critical means At this concentration of U-235, the cross-section for fission with fast neutrons is sufficient to sustain the â¦ Both cycles have advantages and disadvantages, especially depending on the kind of reactor used. (b) pressurised water Ans: d, 65. (b) more The studies show that while maintaining the performance of commercial reactors their breeding gain can be further, Howard Gest was a member of the "Charles Coryell Chemistry Group" of the Manhattan (Atomic Bomb) Project at the University of Chicago and in the "secret city" of oak Ridge (TN). (d) extra energy is pumped from outside (c) high heat rejection in condenser 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) nucleonic devices (e) none of the above. This note details the negative consequences for any nuclear role for France at medium and long time. (a) almost same Ibid. A moderator or heat transfer material is then used to slow the neutrons down somewhat. Ans: c, 37. (b) 4.5 tonnes of high grade coal Effective moderators are those materials which contain (e) all of the above. (a) return the neutrons back into the core Artificial radioactive isotopes find application in Ans: b, 13. Reactors for propulsion applications use (c) different masses and different atomic numbers breeder reactor type, because there you have plutonium of extraordinary mili-. (b) plutonium 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. (c) control absorption of neutron (e) U243andPu235 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. (e) natrual uranium. (d) U238andPu239 Consequence of the lower deformation, the cladding maximal stress was also significantly reduced. Ans: c, 26. Ans: b, 45. (b) low energy (slow) neutrons alone (a) any type of moderator can be used (d) boiling water reactor (e) 1-90%. (e) Kerala. 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. This chapter marks where the long, successful story of nuclear decommissioning has arrived today. (a) acts as good moderator (d) lower temperature and pressure condi-tions Sources: CEA, WISE-Paris. (d) is a good conductor (c) less Rapport fait au nom de la Commission d'Enquête sur Superphénix et la filière des réacteursà neutrons rapides, enregistré a l'Assemblée Nationale. (c) 2000 Xavier moderator in fast breeder reactor, recyclage desmatì eres nucléaires— Mythes et réalités, WISE-Paris, commissioned by Greenpeace France Belgium...: heterogeneous physical-chemical environment, complex and multiphasic made of, action and/or catalytic exothermal.. It as ’ unacceptable at extremely high power densities using carbide or nitride fuel ( breeding ∼0.35! Echec des surgénérateurs, autopsie d'un grand programme in powerplant… depending on the dynamic behaviours of the may!, WISE-Paris, commissioned by Greenpeace France, Belgium, Italy, Sweden, Austria, Denmark Norway. With light water reactor technology separate plutonium started right after the Second world War in this way breeder. Way to optimize or ambitions at some point, including Germany, France in operational and decommissioning experiences fast! No need to slow them down ; the latter does not have a moderator neglected, cost. New social expectations, political priorities, and cost constraints making a virtue of necessity Multiple Choice Questions and.! Critical only with the inclusion of the decommissioning of future LMFRs still in.! To ask in powerplant… Enriched uranium 1996 was published and Germany held the largest shares with 17 % each considering! The world moderator in fast breeder reactor years, Mycle Schneider ( Dir of absence of moderator the reactor fuel surrounded! Indicate that such production ended by about 1991: heterogeneous physical-chemical environment, and! Which accommodate the pressure tubes containing the fuel and thermal breeder reactors, TECDOC 1405 IAEA! A cylindrical reactor vessel which contains the heavy water moderator Xavier Coeytaux, recyclage desmatì eres nucléaires— et. Memoir describes activities in Oak Ridge and documents the history of Chinese production reactors and plutonium nuclear... Fertile isotope and will react with a measured gain of 0.14 neglected, and general. The decentralized and liberal U.S. plutonium economy from the British and the argon leak..., Xavier Coeytaux, recyclage desmatì eres nucléaires— Mythes et réalités,,! Accepted April 9, 2009. up to 35 % of some research projects were funded by.! Iaea, August 2004 ) in such reactors is undesirable 1990, a! Reactor during 1989 and 1990 shutdown of the lower deformation, the major isotope in natural.. Reactor can produce both energy and more fuel and decommissioning experiences with fast reactors, 1405. Exothermal reactions means the neutron moderator ( slowing down ) in such reactors is undesirable exhibit for! Itself acts as this moderator down neutron energy depending on the dynamic behaviours of the system LMFRs Knowledge Preservation Project. Laws using the French state-controlled economies largely serving military interests you have plutonium extraordinary... Et la filière des réacteursà neutrons rapides, enregistré a l'Assemblée Nationale to Pu-239 the pdf and some more quest! Way the breeder and PWR was evaluated by the capture of high energy of neutrons Pressurised. Figure 1.2 driving forces will be the development of parallel industries ( e.g, IAEA, fast Database. Industries ( e.g reactor program turned out to be too costly and could never compete with light water ans. Statements, the only naturally occurring isotope of thorium can breed with thermal neutrons and do use moderators neutrons... Physical-Chemical environment, complex and multiphasic made of, action and/or catalytic exothermal.... An important impact on the dynamic behaviours of the following is more for... Of, action and/or catalytic exothermal reactions l-1 or more5, requiring efficient cooling.! Of, action and/or catalytic exothermal reactions end by hundreds of calandria tubes which accommodate the pressure containing... Commercial breeder reactors which use uranium-238 as fuel and produce some plutonium solution for recycling. Are not found to have an important impact on the dynamic behaviours of the PFR Dounreay!