WO2009084402A1 - 燃料集合体結合構造 - Google Patents
燃料集合体結合構造 Download PDFInfo
- Publication number
- WO2009084402A1 WO2009084402A1 PCT/JP2008/072569 JP2008072569W WO2009084402A1 WO 2009084402 A1 WO2009084402 A1 WO 2009084402A1 JP 2008072569 W JP2008072569 W JP 2008072569W WO 2009084402 A1 WO2009084402 A1 WO 2009084402A1
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- WIPO (PCT)
- Prior art keywords
- lock key
- latch sleeve
- fuel assembly
- upper nozzle
- coupling structure
- Prior art date
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Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/334—Assembling, maintenance or repair of the bundles
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
- G21C3/3315—Upper nozzle
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Definitions
- the present invention relates to a fuel assembly coupling structure.
- the fuel assembly of the pressurized water reactor includes a fuel rod 100, an upper nozzle 101, a lower nozzle 102, a guide tube 103, an upper support grid 104, an intermediate support grid 105, a lower support grid 106, a foreign matter filter. It is composed of The upper support grid 104 and the intermediate support grid 105 are mechanically coupled to the guide tube 103, and the lower support grid 106 is mechanically coupled to the lower end of the guide tube 103 together with the lower nozzle 102.
- the fuel rod 100 is held by 105 and the lower support grid 106.
- the upper nozzle 101 is coupled to the upper end portion 108 of the sleeve 107 attached to the upper support grid 104 by welding.
- the sleeve 107 and the guide tube 103 are mechanically coupled.
- the fuel assembly may need to remove the upper nozzle 101 of the fuel assembly in order to replace the fuel rod 100 damaged during operation at the power plant. For this reason, the fuel assembly needs to be designed so that the upper nozzle 101 can be removed.
- the upper nozzle 101 is coupled to the sleeve 107 by welding, so that it could not be easily detached at the power plant.
- a male screw 109 is formed on the upper end portion of the guide tube 103 as an upper nozzle detachable structure that allows the upper nozzle 101 to be detachable, and this is used as a locking cup 110 installed on the upper nozzle 101. Therefore, there is known a fuel assembly coupling structure using the nut 111, which is sandwiched and fixed by a nut 111 having an internal thread 112 formed on the inner surface (see Patent Document 1 below).
- a guide pipe 103 is provided with a protruding portion, and this protruding portion is inserted into an opening of a lock ring (not shown) attached to the upper nozzle 101, and then the lock ring is rotated.
- a fuel assembly coupling structure using a lock ring in which the guide tube 103 and the upper nozzle 101 are coupled by overlapping the projecting portion of the guide tube 103 and the receiving portion of the lock ring (see the following patents). Reference 2).
- the present invention does not require disassembly of the parts when the upper nozzle is detached, eliminating the factor that the removed parts are mixed into the fuel assembly, and causing the upper nozzle to bend vertically. It is an object of the present invention to provide a fuel assembly coupling structure that is free of fuel.
- a fuel assembly coupling structure for solving the above-described problems is A latch sleeve having an overhang formed on the upper end; An upper nozzle formed with a latch sleeve installation hole into which the upper end of the latch sleeve is inserted; A lock key that is installed inside the latch sleeve installation hole and has an opening having a shape corresponding to the protruding portion formed on the lower surface;
- a male screw is formed on a side surface of the lock key, and screw joining means for screw-joining the lock key to the upper nozzle side is provided.
- a fuel assembly coupling structure according to a second aspect of the present invention for solving the above problem is the fuel assembly coupling structure according to the first aspect of the invention,
- the screw joining means includes A female screw is formed on the inner surface of the latch sleeve installation hole, and the lock key and the latch sleeve installation hole are screwed together.
- a fuel assembly coupling structure according to a third aspect of the present invention for solving the above problem is the fuel assembly coupling structure according to the first aspect of the invention,
- the screw joining means includes A cylindrical thick tube is installed inside the latch sleeve installation hole, A female screw is formed on the inner surface of the thick tube, the lock key is installed inside the thick tube, and the lock key and the thick tube are screwed together. .
- the present invention since it is not necessary to disassemble the parts when the upper nozzle is detached, the factor that the removed parts are mixed into the fuel assembly is eliminated, and the fitting portion between the latch sleeve and the lock key, that is, the upper nozzle is detached. Therefore, it is possible to realize a fuel assembly coupling structure in which no vertical backlash occurs in the portion.
- FIG. 4 (a) and 4 (c) are side views of the latch sleeve
- FIG. 4 (b) is a top view of the latch sleeve
- FIG. 4 (d) is an A- view of the latch sleeve shown in FIG. 4 (b). Sectional drawing in A section is shown.
- the latch sleeve 10 has a cylindrical shape, and a rectangular projecting portion 11 having a rounded corner when viewed from above is formed at the upper end of the latch sleeve 10.
- An upper nozzle 30 (see FIG. 6), which will be described later, or a thick tube 40, which will be described later and the latch sleeve 10 to be welded and joined, are fixed to the lower portion of the latch sleeve projecting portion 11 in the vertical direction.
- a flange 12 is formed on the top.
- a gap portion 13 is formed between the latch sleeve projecting portion 11 and the flange portion 12.
- FIG. 5 (a) is a bottom view of the lock key
- FIG. 5 (b) is a side view of the lock key
- FIG. 5 (c) is a top view of the lock key
- FIG. 5B is a cross-sectional view taken along the line BB shown in FIG. 5
- FIG. 5E is a cross-sectional view taken along the line CC shown in FIG.
- the lock key 20 has a cylindrical shape, and a rectangular lock key opening 21 having a rounded corner that engages with the latch sleeve overhanging portion 11 (see FIG. 4) is formed on the lower surface. ing. The thick portions on the four sides of the lock key opening 21 serve as receiving portions 22 for the lock key 20. A male screw 23 is formed on the side surface of the lock key 20.
- the lock key 20 is rotatably attached to the latch sleeve installation hole 31 of the upper nozzle 30 as shown in FIG.
- the structure of the inner surface of the latch sleeve installation hole 31 will be described in detail in first and second embodiments to be described later.
- FIG. 6A is a view showing a state where the lock key is inserted into the latch sleeve
- FIG. 6B is a view showing a state immediately after the lock key is inserted into the latch sleeve
- FIG. (C) is a view showing a state in which after the lock key is inserted into the latch sleeve, the lock key is rotated to couple the latch sleeve and the lock key.
- the latch sleeve 10 is inserted into the lock key opening 21 attached to the upper nozzle 30 until the upper nozzle fixing portion 12 of the latch sleeve 10 hits the lower surface of the upper nozzle 30 as indicated by an arrow I. Inserted. Then, by rotating the lock key 20 by 45 degrees as indicated by an arrow T, the receiving portion 22 of the lock key 20 enters the gap 13 of the latch sleeve 10, and the overhanging portion 11 of the latch sleeve 10 is the receiving portion of the lock key 20.
- the latch sleeve 10 and the upper nozzle 30 are coupled to each other when the latch sleeve 10 cannot be removed from the lock key 20.
- the lock key 20 is rotated (45 degrees in this case) until the protruding portion 11 of the latch sleeve 10 and the receiving portion 22 of the lock key 20 are not overlapped, thereby pulling out the lock key 20 from the latch sleeve 10.
- the upper nozzle 30 can be removed.
- the protruding portion 11 of the latch sleeve 10 has a shape other than the quadrangle shown in FIGS. 4 to 6, such as a triangle or a polygon, or is formed at the upper end of the latch sleeve 10 as shown in FIG.
- the shape of the overhanging portion 11 may be a flower shape or the like, and the rotation angle of the lock key 20 required for the overhanging portion 11 of the latch sleeve 10 and the receiving portion 22 of the lock key 20 to overlap appropriately according to the shape of the overhanging portion 11. It may be determined.
- FIG. 8A shows a side view of a latch sleeve having a flower-shaped overhanging portion
- FIG. 8B shows a top view of the latch sleeve having a flower-shaped overhanging portion.
- a male screw 23 is formed on the side surface of the lock key 20.
- a female screw 32 is formed on the inner surface of the latch sleeve installation hole 31 of the upper nozzle 30.
- the lock key 20 is installed inside the latch sleeve installation hole 31, and the lock key 20 and the latch sleeve installation hole 31 are screwed together.
- the coupling between the lock key 20 and the latch sleeve 10 is released without completely removing the lock key 20 from the latch sleeve installation hole 31, and the upper nozzle 30. Since it is not necessary to disassemble the parts when the upper nozzle 30 is attached / detached, it is possible to eliminate the factor that the removed parts are mixed into the fuel assembly.
- the receiving portion 22 (see FIG. 6) of the lock key 20 and the protruding portion of the latch sleeve 10 11 (see FIG. 6) can be filled with the bottom surface, so that the vertical play of the fitting portion between the lock key 20 and the latch sleeve 10 can be eliminated at the time of connection, and the lock key 20 at the time of release of the connection. And a gap between the latch sleeve 10 and the latch sleeve 10.
- the female screw 32 processed on the inner surface of the latch sleeve installation hole 31 of the upper nozzle 30 is attached to all the lock keys 20 installed in the upper nozzle 30.
- the processing start point must be adjusted to eliminate rattling when combined.
- a cylindrical thick tube 40 (see FIG. 2), which will be described later, is installed so that the processing start point of the female screw on the upper nozzle 30 side can be easily adjusted.
- the lock key 20 is installed inside 40.
- the thick tube 40 has a cylindrical shape, and a female screw 41 is formed on the inner surface of the thick tube 40.
- the inner surface of the latch sleeve installation hole 31 and the outer surface of the thick tube 40 form a flat surface, and the latch sleeve installation hole 31 of the upper nozzle 30 is formed. It is installed to be freely rotatable.
- the processing start point of the female screw 41 formed on the inner surface of the thick pipe 40 is the combination of the lock key 20 and the latch sleeve 10.
- the installation angle is adjusted so as to eliminate backlash in the vertical direction.
- These thick tubes 40 are connected to the upper nozzle 30 by welding or the like after the installation angle is adjusted. Then, the lock key 20 is installed inside the thick tube 40 combined with the upper nozzle 30.
- the individual adjustments are made so as to eliminate the vertical play when combined by the thick tube 40, and the thick tube 40 and the upper end portion 108 of the upper nozzle 30 are simply connected by welding or the like. It is possible to optimize the processing start point of the formed female screw 41, and it is possible to eliminate play in the up-down direction at all the coupling locations installed in the upper nozzle 30.
- the thimble plug in the fuel assembly coupling structure according to the third embodiment of the present invention will be described.
- the thimble plug 51 attached to the thimble plug assembly 50 as shown in FIG. 9 is mechanically coupled to the latch sleeve 10 and the inside of the latch sleeve 10 of the upper nozzle 30 shown in FIG.
- the core bypass flow generated by the cooling water flowing through the guide tube 52 is controlled.
- FIG. 3 (a) is a view showing a state where the thimble plug is inserted into the lock key and the latch sleeve
- FIG. 3 (b) is DD in FIG. 3 (a) of the thimble plug projecting portion.
- 3C is a top view of the lock key in the direction indicated by EE in FIG. 3A
- FIG. 3D is a view after the thimble plug is inserted into the lock key and the latch sleeve. It is the figure which showed a mode.
- FIG. 3 shows a hexagonal counterbored hole 60 formed on the top of the lock key 20. If a hexagonal projecting portion 61 is formed at the axial position of the thimble plug 51 so as to fit into the hexagonal countersink hole 60 when the thimble plug 51 is inserted, the thimble plug 51 is inserted into the countersink hole 60. By doing so, the hexagonal counterbore hole 60 and the hexagonal thimble plug projecting portion 61 of the thimble plug 51 are fitted together, and the lock key 20 can be prevented from rotating.
- the fuel assembly coupling structure includes the thimble plug 51 inserted into the lock key 20 and the latch sleeve 10, and the countersink hole 60 other than the circular shape is formed in the upper part of the lock key 20.
- An overhang 61 having a shape that fits into the counterbore hole 60 is formed into a thimble plug overhang 61, and the rotation of the lock key 20 is prevented by fitting the thimble plug overhang 61 into the counterbore 60. It is said.
- the countersink hole 60 has a hexagonal shape as an example.
- other shapes may be used instead of a circle, for example, a polygon or a structure having a key on the surface.
- the shape of the thimble plug overhang 61 may be determined according to the shape of the counterbore hole 60 so that the counterbore 60 and the thimble plug overhang 61 are engaged with each other.
- the protruding portion 61 provided in the thimble plug 51 and the counterbore hole 60 of the lock key 20 are formed by simply inserting the thimble plug 51 into the lock key 20 and the latch sleeve 10. Since it is fitted, the lock key 20 can be prevented from rotating.
- the present invention can be used for, for example, a coupling structure of an upper nozzle of a fuel assembly used in a pressurized water reactor and an upper end of a guide tube.
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Fuel-Injection Apparatus (AREA)
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Abstract
Description
また、上述した従来のロックリングを用いた燃料集合体結合構造の場合、案内管103及びロックリングの製造公差の範囲で案内管103の張り出し部の底面とロックリングの受け部との間に隙間が生じてしまい、案内管103の張り出し部とロックリングとの嵌合部、すなわち上部ノズルの脱着部に上下方向のがたが生じてしまう。
上端部に張り出し部が形成されたラッチスリーブと、
前記ラッチスリーブの上端部が挿入されるラッチスリーブ設置穴が形成される上部ノズルと、
前記ラッチスリーブ設置穴の内部に設置され、前記張り出し部と対応する形状の開口部が下面に形成されたロックキーとを備え、
前記ラッチスリーブの上端部を前記ロックキーに挿入した上で該ロックキーを回転させて、前記ラッチスリーブと前記ロックキーとを結合する燃料集合体結合構造において、
前記ロックキーの側面に雄螺子を形成し、前記ロックキーを前記上部ノズル側に対して螺子接合させる螺子接合手段を備える
ことを特徴とする。
前記螺子接合手段は、
前記ラッチスリーブ設置穴の内面に雌螺子を形成して、前記ロックキーと前記ラッチスリーブ設置穴とを螺子接合させたものである
ことを特徴とする。
前記螺子接合手段は、
前記ラッチスリーブ設置穴の内部に円筒形状の肉厚管を設置し、
前記肉厚管の内面に雌螺子を形成し、前記肉厚管の内部に前記ロックキーを設置して、前記ロックキーと前記肉厚管とを螺子接合させたものである
ことを特徴とする。
はじめに、本発明の燃料集合体結合構造に係るラッチスリーブの構造の例について説明する。
図4において、図4(a),(c)はラッチスリーブの側面図、図4(b)はラッチスリーブの上面図、図4(d)はラッチスリーブの図4(b)に示すA-A断面での断面図を示している。
ラッチスリーブ張り出し部11と鍔部12との間には隙間部13が形成されている。
図5において、図5(a)はロックキーの下面図、図5(b)はロックキーの側面図、図5(c)はロックキーの上面図、図5(d)は図5(a)に示すB-B断面での断面図、図5(e)は図5(a)に示すC-C断面での断面図を示している。
図6において、図6(a)はラッチスリーブにロックキーが挿入される様子を示した図、図6(b)はラッチスリーブにロックキーが挿入された直後の様子を示した図、図6(c)はラッチスリーブにロックキーが挿入された後にロックキーを回転させてラッチスリーブとロックキーとが結合された様子を示した図である。
図1に示すように、ロックキー20の側面には雄螺子23が形成されている。上部ノズル30のラッチスリーブ設置穴31の内面には雌螺子32が形成されている。ロックキー20はラッチスリーブ設置穴31の内部に設置され、ロックキー20とラッチスリーブ設置穴31とは螺子接合されている。
まず、本実施例の背景について説明する。上述した第1の実施例に係る燃料集合体結合構造の場合、ロックキー20とラッチスリーブ10の結合・解除操作において、ロックキー20を回転させると、ラッチスリーブ設置穴31の内面に形成された雌螺子32を通して回転しながら上下方向に昇降する。
上述した第1及び第2の実施例に係るロックキー20が、何らかの理由で回転してゆるんだ場合、ロックキー20とラッチスリーブ10との嵌合部が解除されたり、上下方向のがたが生ずるおそれがある。このためロックキー20が回転してゆるむことを防止するためのロックキー20の回り止め構造を設ける必要がある。
Claims (3)
- 上端部に張り出し部が形成されたラッチスリーブと、
前記ラッチスリーブの上端部が挿入されるラッチスリーブ設置穴が形成される上部ノズルと、
前記ラッチスリーブ設置穴の内部に設置され、前記張り出し部と対応する形状の開口部が下面に形成されたロックキーとを備え、
前記ラッチスリーブの上端部を前記ロックキーに挿入した上で該ロックキーを回転させて、前記ラッチスリーブと前記ロックキーとを結合する燃料集合体結合構造において、
前記ロックキーの側面に雄螺子を形成し、前記ロックキーを前記上部ノズル側に対して螺子接合させる螺子接合手段を備える
ことを特徴とする燃料集合体結合構造。 - 前記螺子接合手段は、
前記ラッチスリーブ設置穴の内面に雌螺子を形成して、前記ロックキーと前記ラッチスリーブ設置穴とを螺子接合させたものである
ことを特徴とする請求項1に記載の燃料集合体結合構造。 - 前記螺子接合手段は、
前記ラッチスリーブ設置穴の内部に円筒形状の肉厚管を設置し、
前記肉厚管の内面に雌螺子を形成し、前記肉厚管の内部に前記ロックキーを設置して、前記ロックキーと前記肉厚管とを螺子接合させたものである
ことを特徴とする請求項1に記載の燃料集合体結合構造。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08866538.5A EP2196997B1 (en) | 2007-12-28 | 2008-12-11 | Coupling structure for a fuel assembly |
CA2687678A CA2687678C (en) | 2007-12-28 | 2008-12-11 | Coupling structure of fuel assembly |
US12/601,681 US8964930B2 (en) | 2007-12-28 | 2008-12-11 | Coupling structure of fuel assembly |
CN2008800170645A CN101681684B (zh) | 2007-12-28 | 2008-12-11 | 燃料组件的连接结构 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2007-339284 | 2007-12-28 | ||
JP2007339284A JP4709824B2 (ja) | 2007-12-28 | 2007-12-28 | 燃料集合体結合構造 |
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WO2009084402A1 true WO2009084402A1 (ja) | 2009-07-09 |
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PCT/JP2008/072569 WO2009084402A1 (ja) | 2007-12-28 | 2008-12-11 | 燃料集合体結合構造 |
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US (1) | US8964930B2 (ja) |
EP (1) | EP2196997B1 (ja) |
JP (1) | JP4709824B2 (ja) |
CN (1) | CN101681684B (ja) |
CA (1) | CA2687678C (ja) |
RU (1) | RU2412492C1 (ja) |
WO (1) | WO2009084402A1 (ja) |
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RU2546648C2 (ru) | 2012-10-22 | 2015-04-10 | Открытое акционерное общество "Опытное Конструкторское Бюро Машиностроения имени И.И. Африкантова" (ОАО "ОКБМ Африкантов") | Тепловыделяющая сборка ядерного реактора |
RU2534391C2 (ru) * | 2013-02-19 | 2014-11-27 | Открытое акционерное общество "Машиностроительный завод" | Тепловыделяющая сборка ядерного реактора |
CN104575629B (zh) * | 2014-12-05 | 2017-05-31 | 上海核工程研究设计院 | 一种可拆式上管座与导向管的连接结构 |
EP3266026B1 (en) | 2015-03-03 | 2020-10-21 | NuScale Power, LLC | Fasteners for nuclear reactor systems |
CN106935281A (zh) * | 2015-12-31 | 2017-07-07 | 中核建中核燃料元件有限公司 | 一种燃料组件上管座 |
RU2627307C1 (ru) * | 2016-07-15 | 2017-08-07 | Публичное акционерное общество "Машиностроительный завод" | Тепловыделяющая сборка ядерного реактора |
CN114215833B (zh) * | 2021-11-18 | 2023-01-03 | 中国核动力研究设计院 | 一种消除扭矩且均匀承载的导向管连接结构及燃料组件 |
CN116580859B (zh) * | 2023-06-13 | 2024-03-05 | 四川大学 | 分离式燃料组件快速可拆连接结构及拆卸方法 |
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- 2008-12-11 CA CA2687678A patent/CA2687678C/en active Active
- 2008-12-11 RU RU2009144144/07A patent/RU2412492C1/ru active
- 2008-12-11 US US12/601,681 patent/US8964930B2/en active Active
- 2008-12-11 EP EP08866538.5A patent/EP2196997B1/en active Active
- 2008-12-11 CN CN2008800170645A patent/CN101681684B/zh active Active
- 2008-12-11 WO PCT/JP2008/072569 patent/WO2009084402A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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EP2196997B1 (en) | 2014-08-13 |
CN101681684B (zh) | 2012-06-27 |
RU2412492C1 (ru) | 2011-02-20 |
US20100119031A1 (en) | 2010-05-13 |
EP2196997A1 (en) | 2010-06-16 |
US8964930B2 (en) | 2015-02-24 |
JP4709824B2 (ja) | 2011-06-29 |
EP2196997A4 (en) | 2013-11-13 |
JP2009162503A (ja) | 2009-07-23 |
CA2687678C (en) | 2013-11-26 |
CA2687678A1 (en) | 2009-07-09 |
CN101681684A (zh) | 2010-03-24 |
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