[특허]Protective device for lower end portion of a nuclear fuel rod cladding

[미국특허] Protective device for lower end portion of a nuclear fuel rod cladding 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G21C-003/34 G21C-019/00
출원번호	US-0386065 (1989-07-28)
발명자 / 주소	Roberts Elwyn (Lugoff SC) Mauterer Warren L. (Columbia SC) Ferrari Harry M. (Fox Chapel PA) Stanutz Robert N. (Monroeville PA)
출원인 / 주소	Westinghouse Electric Corp. (Pittsburgh PA 02)
인용정보	피인용 횟수 : 5 인용 특허 : 21

초록 ▼

A nuclear fuel assembly having an array of longitudinally extending fuel rods and axially spaced transverse grids with cells receiving the fuel rods therethrough employs anti-fretting protective devices for protecting lower end portions of tubular claddings of the fuel rods from damage-inducing contact with debris entrained in upward flow of coolant through the fuel assembly. Each device is in the form of a hollow sleeve disposed about and extending coextensive with the lower end portion of one fuel rod cladding. The sleeve has an upper portion which extends through one grid cell between lower and upper ends thereof, and a lower portion which extends below the grid cell from the lower end thereof to a bottom end of the fuel rod cladding spaced below the grid cell lower end.

대표청구항 ▼

In a nuclear fuel assembly for receiving an upward flow of coolant therethrough and including an elongated fuel rod extending along the upward coolant flow and a grid extending transverse thereto, said grid being composed of interleaved walls disposed in an egg-crate configuration and having upper and lower opposite ends defining at least one cell extending therebetween which receives a portion of the upward coolant flow therethrough said fuel rod having a tubular cladding with a lower end portion thereof extending through said grid cell from said upper ends of said grid cell walls downwardly past said lower ends of said grid cell walls to a bottom end of said cladding spaced below said lower ends of said grid cell walls, said tubular cladding lower end portion being spaced radially inwardly at an exterior surface thereof from said grid cell walls, and anti-fretting protective device comprising: (a) a hollow sleeve disposed about and separate from said lower end portion of said fuel rod cladding of said fuel rod and attached to said cell walls of said grid, said separate sleeve having a larger diameter than said fuel rod cladding lower end portion such that said sleeve is spaced radially outward from said lower end portion, said separate sleeve extending coaxial and coextensive with said lower end portion of said fuel rod cladding so as to shield the sam from contact by debris entrained in the upward coolant flow and thereby avoid fretting of said lower end portion of said fuel rod cladding; (b) said sleeve having an upper portion which extends through said grid ell between said lower and upper ends of said grid cell walls, said upper portion of said sleeve having an upper edge being disposed approximately at the level of said upper end of said grid cell walls, said upper portion of said sleeve being attached to said grid cell walls; (c) said sleeve also having a lower potion which extends below said grid cell from said lower end of said grid cell walls to said bottom end of said fuel rod cladding.

이 특허에 인용된 특허 (21) 인용/피인용 타임라인 분석

Campbell Charles S. (Hale GB2), Apparatus for use in liquid alkali environment.
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Anthony Andrew J. (Tariffville CT), Arrangement for retaining a fuel rod in a reconstitutable fuel assembly.
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Marmonier Pierre (Aix-en-Provence FR) Mesnage Bernard (Madras IN) Skok Jean (Aix-en-Provence FR) Vayra Jean (Meyreuil FR), Bracing device for a bundle of parallel pins in a nuclear reactor assembly.
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Raven Leonard F. (Holmes Chapel ; Crewe GB2) Naylor Joseph E. (Fulwood ; Preston GB2) Crossley Brian (Kirkham ; Preston GB2), Cellular grids with twin ferrules.
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Hwang Sun-Keun (Seoul PA KRX) Sabol George P. (Murrysville PA) Barry Robert F. (Monroeville PA), Composite nuclear fuel cladding tubing and other core internal structures with improved corrosion resistance.
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Brown Charles A. (Kennewick WA) Holzer Rolf (Erlangen WA DEX) Patterson John F. (Richland WA), Debris-resistant fuel assembly.
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Weiss Albert (Whitehall PA), Element immersed in coolant of nuclear reactor.
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Miki Kazuyoshi (Kawasaki JP), Fuel assembly of fast breeder reactor.
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Palmer, David N., Getter-lubricant coating for nuclear fuel elements.
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Cheng Bo-Ching (Fremont CA) Rosenbaum Herman S. (Fremont CA) Armijo Joseph S. (Saratoga CA), Method for forming nuclear fuel containers of a composite construction and the product thereof.
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Takase Iwao (Toukai JPX) Yoshida Toshimi (Mito JPX) Ikeda Shinzo (Toukai JPX) Masaoka Isao (Hitachi JPX) Nakajima Junjiro (Hitachi JPX), Method of producing a cladding tube for reactor fuel.
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Delafosse Jacques (Gif-sur-Yvette FR) Viaud Jean-Luc (Gif-sur-Yvette FR), Nuclear fuel assembly.
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Canat Jean-Nol (Lyons FRX) Pla Jol (Villeurbanne FRX), Nuclear fuel assembly with a free end grid.
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Dunlap Thomas G. (San Jose CA) Jameson ; Jr. William G. (San Jose CA) Mefford Carl R. (Los Gatos CA) Nelson Harold L. (San Jose CA) Cearley James E. (San Jose CA), Nuclear fuel assembly with coolant conducting tube.
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Nelson Harold L. (San Jose CA) Dunlap Thomas G. (San Jose CA) Johansson Eric B. (San Jose CA) Matzner Bruce (San Jose CA), Nuclear fuel assembly with large coolant conducting tube.
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Morita Toshio (Wilkinsburg PA), Nuclear fuel cladding containing a burnable absorber.
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Armijo Joseph S. (Saratoga CA) Coffin ; Jr. Louis F. (Schenectady NY), Nuclear fuel element.
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Christiansen David W. (Kennewick WA), Nuclear fuel spacer grid.
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Osborne Jon L. (West Richland WA), Spacer capture rod to space grid attachment device.
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Gillett James E. (Greensburg PA) Sherwood Donald G. (Monroeville PA) Shockling Larry A. (Plum Borough PA), Wear resistant zirconium base alloy article for water reactors.
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Ferrari Harry M. (Edgewood PA) Boyle Raymond F. (San Mateo CA) Kingsbury ; Jr. Fred D. (Plum PA), Zirconium base fuel cladding resistant to PCI crack propagation.
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이 특허를 인용한 특허 (5) 인용/피인용 타임라인 분석

King Harold B., Fuel bundle filter for a nuclear reactor fuel bundle assembly.
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Johansson Eric B. (Wrightsville Beach NC), Lower tie plate debris catcher for a nuclear reactor.
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Evans, Paul Marcus; Marzean, Michael Anthony, Protective grid attachment.
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Croteau Edward A. (Wilmington NC) Evans Thomas G. (Wilmington NC) Elkins Robert B. (Wilmington NC), Reduced height flat spring spacer for nuclear fuel rods.
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Croteau Edward A. (Wilmington NC) Muncy Donald G. (Wilmington NC) Johansson Eric B. (Wrightsville Beach NC), Reduced height spacer for nuclear fuel rods.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Protective device for lower end portion of a nuclear fuel rod cladding 원문보기