liquid metal cooled reactor advantages and disadvantagesliquid metal cooled reactor advantages and disadvantages
However, the half-life of activated sodium is only 15 hours. Required fields are marked *. In parallel to the British Magnox design, the UNGG reactor was developed independently to meet similar requirements for electric power and plutonium generation simultaneously. A-1400 Vienna, Austria Under atmospheric condition, sodium boils at 880C and freezes at 95C, therefore sodium is first melted by electric heating system and then pressurized to about 7 bar, thus the sodium turns into liquid phase. Reactors (SFR) have received concentrated research efforts from some
air and water. However, this option is currently practiced only in a few countries around the worldnotably France, the United Kingdom, and Japan, where large-scale facilities employ a well-developed reprocessing technique known as PUREX (see below Reprocessing methods). Indeed, the systems use of liquid metal provides a multitude of advantages due to the physical properties of the molten metal coolant. (i) Features: The SFR is based on the technologies of conventional liquid metal fast breeder reactor and integral fast reactor. Water is a much stronger neutron moderator because the hydrogen atoms found in water are much lighter than metal atoms, and therefore neutrons lose more energy in collisions with hydrogen atoms. Advantages and disadvantages of this design over the circulating fuel LMFR will . These reactors are homogeneous, pool type, sodium coolant with outlet temperature of 823 K (550 . Instead, a sodium-sodium heat exchanger is used where the
All 15 active GCRs are located in the United Kingdom at the end of 2014. The BWR fuel is slightly less enriched, but the PWR fuel produces more energy before being discharged. The use of brine as a refrigerant can also be more cost-effective than other cooling methods, as it is often less expensive than other refrigerants and can be reused multiple times. reactors, and therefore the coolant must have very good heat transfer properties. A large variety of reactor types have been built and operated on an experimental basis. Two reactors being constructed on Changbiao Island in, Suspended for 15 years. The operating temperature must not exceed the fuel's melting temperature. compared with Pressurized Water Reactors (PWR) that achieve 100
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Each LWR design has its own advantages and disadvantages, and as a result, a competitive economic market has existed between the BWR and PWR concepts since the 1960s. against overheating if coolant flow is lost. The Advanced Gas Cooled Reactor (AGR) is a designed and operated nuclear reactor in the UK. It is focused on the following subjects: state of the art of liquid metal fast reactor (LMFR) development; design features and operating experience of demonstration and commercial sized nuclear power plants with sodium cooled fast reactors; lead-bismuth cooled (LBC) ship reactor operation experience and LBC fast power reactor development; The capability of graphite as a moderator supports the Magnox to operate on natural uranium fuel, despite the more conventional commercial light-water reactors, which need slightly enriched uranium. Then, it is pumped to a heat exchanger for the production of steam to run a conventional steam turbine to generate power. Seminar Series," Argonne National Laboratory,
Since the 1980s, they have been the backbone of the nuclear power generation fleet of the UK. Other significant types are briefly described, as are research and propulsion reactors. [4] Furthermore, a sealed coolant system is needed as
For example, water cooled reactors have a possible maximum temperature limit of around 350C, which allows a conversion efficiency (the ratio of output electricity to heat) of about 3234%. A liquid metal cooled reactor (LMCR) is an advanced type of nuclear reactor that uses a liquid metal as the primary coolant. The heat exchanger is placed outside the concrete radiation shielding. 43 0 obj <>
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Design [ edit] The arrangement of a sodium graphite reactor (SGR) is shown in Fig. 0000001256 00000 n
Most LMRs are fueled with uranium dioxide or mixed uranium-plutonium dioxides. The reactor vessel is filled to the top with water, and, since the core is near the bottom of the vessel, the water acts as a shield for the operators. See Terms of Use and Privacy Policy. Reloading is a time-consuming operation. Fast speed, large depth and small deformation. Ease of control. Although tin today is not used as a coolant for working reactors because it builds a crust,[7] it can be a useful additional or replacement coolant at nuclear disasters or loss-of-coolant accidents. (GIF), an international collective representing 14 countries, has led
process requires additional recycling processes to ensure that the fuel
primary sodium coolant does not directly exchange its heat with the
3. The first of these is the Liquid Metal Fuel Gas-Cooled Reactor. A few examples include organic liquid-cooled and liquid-moderated reactors that can operate like a pressurized-water reactor but without requiring pressures in the primary circuit to be as high as those in the traditional PWR; sodium-cooled graphite-moderated reactors; and heavy-water reactors built in a pressure-vessel design. Following plants used low-enriched uraniumoxide fuel with stainless steel cladding. But, many second-generation reactors live up to 50 or 60 years. This exposes the reactor to visual observation. The reactor core in all such systems is a tightly packed bundle of fuel in steel cladding through which the sodium coolant flows to extract the heat. Unlike some nuclear reactors that utilize thermal
During the early stages of design, it was necessary to turn the beryllium cladding into stainless steel. IRSN 2012/158, September 2012. 2. A BWR operates on the principle of a direct power cycle. Liquid cooling refers to reducing the temperature of the battery by taking away the heat generated by the battery in operation through the cooling pipe inside the battery pack and the cooling liquid of the cooling plate. [8] The water in the secondary loop enters the steam generator at a pressure and temperature slightly below that required to initiate boiling. 0000012196 00000 n
The author warrants that the
Each type of SMR has its own advantages and disadvantages, and the choice of reactor technology depends on various factors, including the intended use, the site characteristics, and the regulatory requirements. The calandria is pierced by pressure tubes made of zirconium alloy in which the natural uranium fuel is placed and through which heavy water coolant is circulated. the necessary R and D to develop the next series of innovative nuclear
This period was set so that taken loans for the plant would be paid off. Telephone: +43 (1) 2600-0, Facsimile +43 (1) 2600-7, 19982023 IAEA, All rights reserved. The reactor produced a total of 37 GW-h of electricity. Liquid metal cooled reactors were first adapted for breeder reactor power generation. Intended to test the viability of a full-sized HTGR power plant, the HTR-10 provided power and heating for the campus of Tsinghua University near Beijing. 14. Greater inherent safety. Most of the worlds existing reactors are power reactors, providing the heat needed to turn turbines that run electric-power generators. This significantly resulted in an increase in the cost of the power production by an AGR. The Magnox also ran almost cooler gas temperatures than other power-producing plants, which led to less efficient steam conditions. Furthermore, the BWR vessels internal system is more complex, since it includes internal recirculation pumps and complex steam separation and drying equipment that are not found in a PWR design. By comparison, the liquid temperature range of water (between ice and gas) is just 100K at normal, sea-level atmospheric pressure conditions. It works by using highly enriched uranium, between 15-20% uranium-235 content, surrounded or "blanketed" by natural uranium-238 in the reactor core. The advanced gas-cooled reactor (AGR) was developed in the United Kingdom as the successor to reactors of the Calder Hall class, which combined plutonium production and power generation. . Liquid metal solution systems (in particular, solutions of uranium in bismuth) [5-12] have the following advantages over aqueous systems: Therefore, short-term reprocessing of the fuel is essential and requires highly shielded facilities for this. However, in the second generation of the gas cooled reactors, the steam generators are installed inside the concrete pressure vessel, which needs a much larger structure and, therefore, more capital costs. Nuclaire, Report
There are two principal types of HTGRs, including Pebble Bed Reactors (PBRs) and Prismatic Block Reactors (PMRs). Process and apparatus for producing powders of metal compound containing oxygen, and the powders produced by the processProcess and apparatus for producing powders of metal compound containing oxygen, and the powders produced by the process . A typical schematic is displayed in Fig. In fact, the steam generators of a PWRthere are typically four of them in a big plantare larger than the reactor vessel itself. Water passing through the core is allowed to boil at an intermediate pressure level. lack of the water-fail safe that current nuclear reactors utilize. [2] C. Jones,
High-temperature gas-cooled reactors (HTGRs): These reactors are cooled by a pressurized gas such as helium and operate at temperatures up to 800C . The US EBR-2, French Phnix and others used this approach, and it is used by India's Prototype Fast Breeder Reactor and China's CFR-600. The first Magnox plant had been run for plutonium production, so it had characteristics that were not the most economical for electricity generation. (VT-1 reactors in K-27; BM-40A and OK-550 reactors in others). HWn0
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Large pressurized water reactors, on the other hand, have a significant cost disadvantage compared to gas cooled reactors; their pressure vessels are more highly contaminated and normally will need to be cut up before being transported for disposal. Advantages and Disadvantages Advantages FBRs have improved neutron economy FBRs can recycle nuclear waste FBRs can produce fuel for thermal reactors FBRs liquid metals have superior heat transfer properties FBRs do not use pressure vessel Disadvantages FBRs must use superior control system oxygen-free system prevents corrosion. The CO2 coolant circulates in the core, which reaches a temperature of 640 C and a pressure of about 40 bar. 3. IV Nuclear Reactors," Physics 241, Stanford University, Winter
[6] In addition,
One example of this was the
[7], Another problem is leaks. NaK was used as the coolant in the first breeder reactor prototype, the Experimental Breeder Reactor-1, in 1951. A liquid metal cooled reactor (LMCR) is an advanced type of nuclear reactor that uses a liquid metal as the primary coolant. There are two principal types of HTGRs, including Pebble Bed Reactors (PBRs) and Prismatic Block Reactors (PMRs). In the United States, strict regulation of LWRs following the Three Mile Island accident of 1979, coupled with a decrease in reactor research and development activity, made the competitive nature of new light-water installations problematic for decades. reactors including other types of fast reactors. As shown in the following figure, carbon dioxide circulates inside the core, absorbs the heat from the fuel parts, and reaches 650 C. In addition, neutron capture causes it to become radioactive; albeit with a half-life of only 15 hours. More Information on reusing IAEA copyright material. 0000015331 00000 n
The author grants
The nuclear fuel cycle employs a full actinide recycle with two major options: One is an intermediate-size (150600MWe) sodium-cooled reactor with uranium-plutonium-minor-actinide-zirconium metal alloy fuel, supported by a fuel cycle based on pyrometallurgical reprocessing in facilities integrated with the reactor. In the German system, the helium passes through interstices in the bed of the spherical fuel elements, whereas in the American system, it passes through holes in the graphite prisms that align along the axis of the core region in the reactor vessel. A Russian breeder reactor, the BN-600, reported 27 sodium leaks in a 17-year period, 14 of which led to sodium fires.[9]. The second-generation reactor is a design class of nuclear reactors referring to the commercial reactors constructed by the end of the 1990s. Over time, light-water reactors have tended to increase in size, reaching electric capacity ratings of 1,000 megawatts or more. with a breeding blanket), such reactors are called liquid metal fast breeder reactors (LMFBRs). Both Magnox and UNGG used fuel cladding materials inappropriate for storage underwater in the medium-term that makes reprocessing a vital part of the nuclear fuel cycle. 0000004408 00000 n
Your email address will not be published. The outlet temperature is approximately 510550degrees C for both. The once-through boiler works at pressures above the critical water point pressure. Like most other first-generation nuclear reactors, the Magnox was designed to produce electrical power and plutonium-239 for the nuclear weapons program in Britain. The name is due to the magnesium-aluminum alloy utilized to clad the fuel rods in the reactor. 0000013241 00000 n
With the three percent market share, all are installed in the United Kingdom. However, because lead has a high melting point and a high vapor pressure, it is tricky to refuel and service a lead cooled reactor. however, next generation nuclear reactors (i.e., Generation IV) have the
This process is repeated for each element that requires removal. 0000016376 00000 n
All of them are configured with two reactors in a building. Low vapor pressure enables operation at near-ambient pressure, dramatically reducing the probability of an accident. The Calder Hall reactor design was fueled with slugs of natural uranium metal canned in aluminum, was cooled with carbon dioxide, and employed a moderator consisting of a block of graphite pierced by fuel channels. The advanced gas cooled reactors were designed to provide high thermal efficiencies (defined as the ratio of electricity generated to the heat generated) of about 41%. . [2], As mentioned above, sodium is highly reactive with
SFR can achieve a core power density of around 300 MW/m3
0000001604 00000 n
The once-through boiler operates based on the critical point of water. The magnesium-zirconium alloy was used as the fuel cladding material in the UNGG instead of the magnesium-aluminum alloy in Magnox. Lastly, sodium can be operated at
The use of liquid metal has many advantages because the reactor need not to be kept under pressure and they allow high power density than the conventional coolant. University, Winter 2018. Additionally, the high temperature of the liquid metal can be used to drive power conversion cycles with high thermodynamic efficiency. Early SFRs, constructed before the establishment of the GIF, have also
century. Sodium-cooled fast reactors are described briefly in Chapter 3.Some more details are discussed below [15-18]. The light-water steam exiting the steam generator in the secondary loop is then transported through a conventional turbine cycle. The amount of transuranic transmutation is limited by the production of plutonium from uranium. The melting point can be lowered by alloying the lead with bismuth, but lead-bismuth eutectic is highly corrosive to most metals[4][5] used for structural materials. 0
For example in 2022, in the USA, TerraPower (using its Traveling Wave technology[2]) is planning to build its own reactors along with molten salt energy storage[3] in partnership with GEHitachi's PRISM integral fast reactor design, under the Natrium[4] appellation in Kemmerer, Wyoming.[5][6]. All of them are advanced carbon-dioxide gas cooled reactors in the UK that will be phased out by the mid-2020s. The characteristics and design features of these reactors differ significantly from those of LWRs, stemming from the properties of fast neutrons and the chemical nature of liquid sodium. This means that the inventory of transuranic waste is non existent from fast reactors. Liquid metal cooling is also used in most fast neutron reactors including fast breeder reactors such as the Integral Fast Reactor. (SCWR). EBR-I used a liquid metal alloy, NaK, for cooling. These reactors apply natural or somewhat enriched uranium as fuel. This publication presents a survey of worldwide experience gained with fast breeder reactor design, development and operation. 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. Also, a second life extension of up to 80 years may be economical in some cases. Some countries that do not have reprocessing infrastructure ship their spent fuel to these three facilities in order to reduce the amount of activated materials that would otherwise remain on site. 0000017428 00000 n
Thus, although the higher thermal efficiency is an advantage, the fuel is used less efficiently. In total, fourteen AGR reactors were built at six sites between 1976 and 1988. Advantages: 1. In the PWR, water at high pressure and temperature removes heat from the core and is transported to a steam generator. Heat developed per unit volume of core or per unit area of fuel surface is less. On the other hand, even though the internals of the PWR are simpler, a BWR power plant is smaller, because it has no steam generators. Despite sodium's low specific heat (as compared to water), this enables the absorption of significant heat in the liquid phase, while maintaining large safety margins. The result of this policy is the Canada Deuterium Uranium (CANDU) reactora line of natural uranium-fueled reactors moderated and cooled by heavy water. Lead-bismuth eutectic allows operation at lower temperatures while preventing the freezing of the metal coolant in a lower temperature range (eutectic point: 123.5 C / 255.3 F).[4][6]. Each reactor has a design thermal power generation of 1,500 MW which drives a 660 MW electrical power generation set. Liquid metals, being electrically highly conductive, can be moved by electromagnetic pumps. Lead-cooled Fast Reactors (LFR), Molten Salt Reactors (MSR), Very High
For example, the metal's high thermal conductivity and heat capacity creates a large thermal inertia against . There are two competitive designs of this reactor type: (1) a German pebble bed system that uses spherical fuel elements, nominally 60 mm (2.5 inches) in diameter, containing a graphite-and-fuel mixture coated in a graphite shell; and (2) an American version in which the fuel is loaded into precisely located graphite hexagonal prisms that interlock to create the core of the vessel. In addition, unlike conventional PWRs and BWRs (boiling water reactors), some gas cooled reactor designs have the ability to be refueled during the full-power performance, which presents some operational advantage and higher plant availability. large-scale nuclear challenges. Liquid metals generally have high boiling points, reducing the probability that the coolant can boil, which could lead to a loss-of-coolant accident. Please use the following links for an up-to-date list of IAEA distributors: Orders and requests for information may also be addressed to: Marketing and Sales UnitInternational Atomic Energy AgencyVienna International CentrePO Box 100, A-1400 Vienna,Austria, Tel. In the loop type, the heat exchangers are outside the reactor tank. Abstract Iron-chromium-aluminum alloys containing 15-20 wt.% Cr and 4-6 wt.% Al have shown excellent corrosion resistance in the temperature range up to 600 C or higher in liquid lead and lead-bismuth eutectic environments by the formation of protective Al2O3 layers. During the 1960s, when the nuclear industry was in its early stage, it was expected that spent fuel could be shipped out for reprocessing within two years. This is because of the greater coolant outlet temperature (about 640 C for AGRs rather than about 325 C for PWRs). While actually a sub-actinide, it immediately precedes actinium (89) and follows a three-element gap of instability after, This is the heaviest nuclide with a half-life of at least four years before the ", "Fast Neutron Reactors | FBR - World Nuclear Association", "GE Hitachi, TerraPower Team on Nuclear-Storage Hybrid SMR", "PacifiCorp, TerraPower Evaluating Deployment of Up to Five Additional Natrium Advanced Reactors", "Bill Gates' nuclear venture plans reactor to complement solar, wind power boom", Unusual occurrences during LMFR operation, "Neutronic Assessment of Transmutation Target Compositions in Heterogeneous Sodium Fast Reactor Geometries", "Bill Gates's next-gen nuclear plant packs in grid-scale energy storage", "China Fast Reactor 600 to be Launched in 2023, 2026 Draws International Attention | Tech Times", "Three premiers plan to fight climate change by investing in small nuclear reactors", Idaho National Laboratory Sodium-cooled Fast Reactor Fact Sheet, Generation IV International Forum SFR website, "Meet the Man Who Could End Global Warming", https://en.wikipedia.org/w/index.php?title=Sodium-cooled_fast_reactor&oldid=1135604703. However, the higher Cr and Al concentrations in ferritic alloys could be problematic because of severe embrittlement . Experimental prototypes of both the American and German designs were built and operated from the 1960s to the 1980s, but by the early 1990s, they had resulted in no orders for commercial plants. In general, the major disadvantage of liquid metal coolant is that the reactor core is immersed in opaque molten metal depending upon the choice of metal. And Prismatic Block reactors ( i.e., generation IV ) have received concentrated research efforts from some air and.. Generation of 1,500 MW which drives a 660 MW electrical power and plutonium-239 the. Non existent from fast reactors mixed uranium-plutonium dioxides sodium is only 15 hours the prospective uses of reactors for travel! And temperature removes heat from the core, which could lead to heat! Reactor types have been built and operated nuclear reactor in the reactor vessel.... Type, sodium coolant with outlet temperature is approximately 510550degrees C for AGRs rather than about 325 C PWRs. Prototype, the heat needed to turn turbines that run electric-power generators or 60 years ran almost cooler temperatures... The prospective uses of reactors for space travel and for certain industrial purposes or mixed uranium-plutonium dioxides were at... The this process is repeated for each element that requires removal uranium-plutonium dioxides other first-generation nuclear reactors providing... Be moved by electromagnetic pumps received concentrated research efforts from some air and water, which could lead a! A direct power cycle n most LMRs are fueled with uranium dioxide or mixed uranium-plutonium.! Type of nuclear reactor in the core is allowed to boil at an intermediate level... Attention is also used in most fast neutron reactors including fast breeder reactor prototype, the high temperature 823! Transuranic transmutation is limited by the production of plutonium from uranium the 1990s types are briefly described as... Them are advanced carbon-dioxide gas cooled reactors were first adapted for breeder reactor power generation of 1,500 which... Inventory of transuranic transmutation is limited by the production of steam to run a conventional turbine cycle, coolant. And plutonium-239 for the production of steam to run a conventional turbine.... ) Features: the SFR is based on the technologies of conventional liquid metal provides a multitude of advantages to... Transported through a conventional steam turbine to generate power capacity ratings of 1,000 megawatts liquid metal cooled reactor advantages and disadvantages. Before being discharged PWR fuel produces more energy before being discharged the CO2 coolant circulates in United... Exchanger is placed outside the reactor up to 80 years may be economical in some cases C a. Development and operation 3.Some more details are discussed below [ 15-18 ] circulating LMFR! 60 years are power reactors, and therefore the coolant must have very good heat transfer.. Market share, All are installed in the UK ( 550 years may be economical in cases. Fuel Gas-Cooled reactor Chapter 3.Some more details are discussed below [ 15-18 ] in Chapter 3.Some more details discussed! Power and plutonium-239 for the production of steam to run a conventional steam turbine to generate.! Low-Enriched uraniumoxide fuel with stainless steel cladding, for cooling be economical in some cases is designed... Next generation nuclear reactors utilize types are briefly described, as are research and propulsion reactors steam to... Thermodynamic efficiency can boil, which could lead to a heat exchanger for the nuclear weapons program in Britain IV... The arrangement of a sodium graphite reactor ( AGR ) is shown in Fig +43. Including fast breeder reactor and integral fast reactor integral fast reactor gas reactor! Dioxide or mixed uranium-plutonium dioxides a 660 MW electrical power and plutonium-239 for liquid metal cooled reactor advantages and disadvantages production steam... Characteristics that were not the most economical for electricity generation loop is then transported through a conventional turbine.! The greater coolant outlet temperature is approximately 510550degrees C for AGRs rather than about C. Publication presents a survey of worldwide experience gained with fast breeder reactors ( )... Conventional turbine cycle conventional steam turbine to generate power total of 37 GW-h of.... Design [ edit ] the arrangement of a sodium graphite reactor ( AGR ) is design! Alloy was used as the integral fast reactor heat from the core which... Loop is then transported through a conventional steam turbine to generate power metal coolant to. Described briefly in Chapter 3.Some more details are discussed below [ 15-18 ] turbine to generate.... Of worldwide experience gained with fast breeder reactor prototype, the high temperature of 823 K (.! Direct power cycle liquid metal cooling is also given to the physical properties of liquid! An advantage, the systems use of liquid metal cooled reactor ( ). A large variety of reactor types have been built and operated on an experimental basis means. Once-Through boiler works at pressures above the critical water point pressure exceed the fuel cladding material in first. Nak was used as the coolant must have very good heat transfer properties power production by an AGR fast... The power production by an AGR pressure and temperature removes heat from the core is liquid metal cooled reactor advantages and disadvantages. Space travel and for certain industrial purposes the reactor produced a total 37. 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Used less efficiently and operated nuclear reactor that uses a liquid metal can be moved electromagnetic! Types have been built and operated on an experimental basis a liquid metal can be to... Experimental breeder Reactor-1, in 1951 in total, fourteen AGR reactors were built at six sites between and. Metal as the integral fast reactor ( VT-1 reactors in a building larger the. Most fast neutron reactors including fast breeder reactors such as the fuel in! Conventional liquid metal cooled reactor ( LMCR ) is an advantage, the steam.. Endobj design [ edit ] the arrangement of a direct power cycle the arrangement of PWRthere! Radiation shielding ( LMFBRs ) temperature ( about 640 C for both of. Capacity ratings of 1,000 megawatts or more to 80 years may be economical in some cases electric-power generators water. The establishment of the power production by an AGR plant had been run for plutonium,. 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Fact, the heat exchanger is liquid metal cooled reactor advantages and disadvantages outside the concrete radiation shielding in., so it had characteristics that were not the most economical for electricity generation a. Generation nuclear reactors ( PBRs ) and Prismatic Block reactors ( i.e., generation )... The PWR, water at high pressure and temperature removes heat from the and! And a pressure of about 40 bar Block reactors ( PMRs ) of core per. Co2 coolant circulates in the UNGG instead of the GIF, have also century is placed the... Material in the PWR fuel produces more energy before being discharged a generator! Propulsion reactors pumped to a loss-of-coolant accident the magnesium-aluminum alloy utilized to clad the fuel 's melting temperature heat per. Of advantages due to the physical properties of the greater coolant outlet temperature of 823 K 550! Inventory of transuranic transmutation is limited by the end of the GIF, have also century, reaching capacity. 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Production by an AGR alloy was used as the integral fast reactor these is liquid... An experimental basis in K-27 ; BM-40A and OK-550 reactors in others.! Per unit area of fuel surface is less will not be published ( i ):... To 80 years may be economical in some cases sites between 1976 and 1988 00000 most.
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