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111. 发明专利

JPH07244179A UPPER END PLUG OF FUEL ROD 失效
公开(公告)号：JPH07244179A
公开(公告)日：1995-09-19
申请号：JP6462594
申请日：1994-03-07
申请人： NUCLEAR FUEL IND LTD
发明人： SHIODA TETSUYA
IPC分类号： G21C3/10 , B23K26/00 , G21C21/02
摘要： PURPOSE:To make sealing work of upper end plug efficient by melting with laser irradiation around a vent hole at the upper surface of an upper end plug, sucking in the vent hole and forming a projection for welding for sealing the end part. CONSTITUTION:A vent hole 7 is formed in the axis direction of an upper end plug 5 and a projection for welding 8 is formed in ring shape in one with the same material as the end plug 5 around the hole 7 of the end plug upper surface 5a. After inserting the upper part of the fuel rod in a pressure room in a chamber and introducing helium gas of ca. 25 to 35kg/cm , laser light is casted by way of a laser light transmission part consisting of pressure resistant glass. The projection for welding 8 is melted by the radiation of laser light and sucked in a hole 1 owing to capillary effect to block the hole 7. By this, the labor and time required for gap adjustment between electrodes and exchange of electrodes are avoided and sealing work of the upper end plug is improved in efficiency.

112. 发明专利

JPH07167975A FUEL ASSEMBLY 失效
公开(公告)号：JPH07167975A
公开(公告)日：1995-07-04
申请号：JP31571593
申请日：1993-12-16
申请人： TOSHIBA CORP
发明人： MASUBUCHI YUKIO
IPC分类号： G21C3/10 , G21C3/326
摘要： PURPOSE:To prevent the falling of short fuel rods during transportation and the separation of the short fuel rods during the operation of a reactor so as to improve fuel reliability. CONSTITUTION:The shank parts 26 of the lower end plugs 23 of a short fuel rod 3 and a long fuel rod 2 adjacent to the short fuel rod 3 are provided with through holes 24. A through hole 17 communicated with the through holes 24 is provided horizontally from the outer side face of a lower tie plate 7. The fixing pin 27 of a separation preventing stopper 16 is inserted into the through hole 17 and the through holes 24. The plate body 19 of the separation preventing stopper 16 is brought into contact with a cutout part 18 provided at the outer side face of the lower tie plate 7, and the separation preventing stopper 16 is fixed to the lower tie plate 7 by screws 22. The falling of a fuel assembly during transportation and the separation of the short fuel rod 3 during the operation of a reactor can be thereby prevented.

113. 发明专利

JPH0798393A PART FOR NUCLEAR REACTOR 失效
公开(公告)号：JPH0798393A
公开(公告)日：1995-04-11
申请号：JP9779894
申请日：1994-05-12
申请人： GEN ELECTRIC
发明人： ARUBUIN JIYOSEFU JIEIKOBUSU , JIERARUDO MAIRON GOODON , RICHIYAADO ARAN PUROEBUSUTORU , MITSUKII OOBUIRU MAAROUI , RONARUDO BAATO ADAMUSON
IPC分类号： G21C3/10 , C22C38/40 , G21C3/07 , G21C3/30 , G21C3/324 , G21D1/00 , G21C13/036
摘要： PURPOSE: To reduce the shadow effect generated on a zirconium alloy parts by using the stainless alloy including manganese of less than a specific density, and austenite stabilizer, and located in adjacent to the zirconium alloy parts. CONSTITUTION: The stainless alloy composition is stainless steel including manganese of very low density (about less than 0.2wt.%), and austenite stabilizer by the amount enough for preventing the martensite transformation. The stainless steel can be effectively used for various kinds of parts such as a control rod handle 22, and a poison curtain 24 of the control rod 20. The stainless steel parts can be particularly effective for the case when the stainless steel parts are used adjacent to the parts made from zirconium group alloy such as Zircaloy. The parts which can be protected by the stainless steel in a boiling water nuclear reactor, are Zircaloy fuel channel 10, Zircaloy fuel cladding tube, or the like.

114. 发明专利

JPH06249984A END PLUG FOR NUCLEAR FUEL 失效
公开(公告)号：JPH06249984A
公开(公告)日：1994-09-09
申请号：JP5948293
申请日：1993-02-23
申请人： NUCLEAR FUEL IND LTD
发明人： YONEDA KAZUTO , NOMURA ICHIRO
IPC分类号： G21C3/10
摘要： PURPOSE:To allow easy gripping of fuel rod by protruding external threads of smaller diameter than an end plug in the axial direction from the tip of the end plug and engaging a convenient gripper with the protrusions. CONSTITUTION:An end plug 7 is secured to the upper and lower end parts of the coating pipe 1a for a part of a fuel assembly, i.e., a fuel rod 1, or the lower end of a simple pipe and substantially formed into a cylinder having a small diameter part 18 to be inserted into each pipe. The end plug 7 is provided with externally threaded 8 protrusions 9, having smaller diameter than the cylindrical part of end plug body 7a, in the axial direction from the center at the tip part. A gripper tool of simple structure having an internally threaded part meshing the protrusions 9 is engaged with the fuel rod 1 by rotating the tool or the fuel rod 1. This structure allows convenient insertion of the fuel rod 1 into a supporting grid at low cost. Alternatively, the end plug may be internally threaded and an externally threaded tool may be employed.

115. 发明专利

JPH06194474A FUEL ROD OF NUCLEAR REACTOR 失效
公开(公告)号：JPH06194474A
公开(公告)日：1994-07-15
申请号：JP25005793
申请日：1993-09-10
申请人： SIEMENS AG
发明人： GERUTOODEIITAA KUREEDE , RAINAA SHIYURAIHI
IPC分类号： B23K11/30 , G21C3/10 , G21C21/02
摘要： PURPOSE: To prevent a coated pipe from being damaged and a fuel rod from getting inferior thereby by eliminating a process of machining after welding between the coated pipe and a blocking plug. CONSTITUTION: A fuel rod for a reactor is provided with a metal coated pipe 4 having a nuclear fuel material filled therein, a blocking plug 8 made of the same metal as the coated pipe is welded on one end of this coated pipe 4, and the coated pipe is provided with a ring swelling part 12 in its outside face in a shifting part from the coated pipe to the blocking plug. The ring swelling part 12 has a cylindrical outer cirucmferential face 13 having a bus parallel to a longitudinal axis 5 of the ring swelling part 12 and the material for the ring swelling part 12 is composed of the same metal as the coated pipe 4 and the blocking plug 8.

116. 发明专利

JPH05180986A FABRICATION METHOD FOR FUEL ROD AND END PLUG USED FOR IT 失效
公开(公告)号：JPH05180986A
公开(公告)日：1993-07-23
申请号：JP33530991
申请日：1991-12-18
申请人： MITSUBISHI NUCLEAR FUEL
发明人： MIWA NOBUO , OUCHI MASAKI
IPC分类号： G21C3/10 , G21C21/02
摘要： PURPOSE:To obtain a fuel rod with desired performance without a possibility of removing end plug from clad by welding each other in the state male screw formed on the end plug is screwed in the female screw formed on the inner surface end of the clad. CONSTITUTION:An end plug 1 has at its one end multi step diameters, and on the first diameter part, a male screw part 3 is formed and a tapered chamfer part 4 is formed at the other end. Also, on the inner surface end of the clad, a female screw is formed. After charging a multitude of pellets in the clad 2, the end plug 1 is screwed in the lower end. A coil spring is inserted in the upper part and an end plug 1 is screwed in the upper end. Then the both ends of the clad and the both end plugs 1 are contacted by welding. In this case, the male screw part 3 and the female screw part 5 are completely melted so that the screw parts are not imaged even with an X-ray inspection. By this, the intactness of the welded part is easily assured.

117. 实用新型

JPH0540900U 失效
公开(公告)号：JPH0540900U
公开(公告)日：1993-06-01
申请号：JP9905091
申请日：1991-11-06
IPC分类号： G21C3/10

118. 实用新型

JPH057594Y2 失效
公开(公告)号：JPH057594Y2
公开(公告)日：1993-02-25
申请号：JP18152786
申请日：1986-11-26
IPC分类号： G21C21/02 , G21C3/10

119. 发明专利

JPH0470597B2 失效
公开(公告)号：JPH0470597B2
公开(公告)日：1992-11-11
申请号：JP26789086
申请日：1986-11-12
申请人： WESTINGHOUSE ELECTRIC CORP
发明人： DEBITSUDO ANSONII BOOTORAITO , UEIDO HANPUTON WAIDONAA
IPC分类号： G21C3/10 , G21C3/334

120. 发明专利

JPH0424678B2 失效
公开(公告)号：JPH0424678B2
公开(公告)日：1992-04-27
申请号：JP27265285
申请日：1985-12-05
申请人： WESTINGHOUSE ELECTRIC CORP
发明人： SUCHUAATO RUISU RIIBEN , MAAKU ERIOTSUTO WAIRII
IPC分类号： G21C3/10 , G21C21/02

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