专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

51. 发明专利

JPH1048378A METHOD FOR MOUNTING CORE SHROUD 失效
公开(公告)号：JPH1048378A
公开(公告)日：1998-02-20
申请号：JP20560196
申请日：1996-08-05
申请人： HITACHI LTD
发明人： ITO MASATO , FURUKAWA HIDEYASU , TADA NOBUO , ONO SHIGEKI
IPC分类号： G21C13/00
摘要： PROBLEM TO BE SOLVED: To surely mount a shroud without damaging the welding bevel at the lower end by adding to a jack a fine control function of the core shroud in peripheral and radial directions. SOLUTION: At the upper part of core shroud support device 8, a fine control mechanism with a motor 8d is provided to enable controlling vertical direction. Before the core shroud is carried in and mounted on the upper surface of a shroud support cylinder 2, the support 16 is supported with a frame 8e on the upper surface of the device 8 so that a shroud 7 is temporarily supported with the device 8. As jacks are fixed with the use of holes from the upper surface of control rod drive mechanism housing 6 standing on the lower head of the reactor pressure vessel, the support device 8 of the shroud 7 makes it possible to mount the shroud 7 on the upper surface of a cylinder 4 by temporarily receiving the support of the shroud 7 with the jacks before mounting on the shroud support upper surface and then lowering the jacks.

52. 发明专利

JPH09218290A METHOD FOR APPROACHING BOTTOM PART OF PRESSURE VESSEL OF REACTOR 失效
公开(公告)号：JPH09218290A
公开(公告)日：1997-08-19
申请号：JP2230896
申请日：1996-02-08
申请人： HITACHI LTD
发明人： FURUKAWA HIDEYASU , OYAMADA OSAMU , TADA NOBUO , ONO SHIGEKI , ITO MASATO
IPC分类号： G21C19/02
摘要： PROBLEM TO BE SOLVED: To provide a method for approaching a reactor bottom part whereby a worker is let to approach the bottom part easily while being refrained from the exposure to radiation and a weight of a shielding body is reduced even if a shroud, a jet pump or the like of high radioactivity remains. SOLUTION: A worker 11 rides on a gondola 12 at an operation floor. Then, after a door of the gondola 12 is closed, the gondola is descended to the vicinity of an upper face of an in-core monitor(ICM) guide pipe 9 by a crane means such as an overhead crane or the like. A hatch 13 at a bottom face of the gondola 12 is opened at the upper face of the ICM guide pipe 9. A ladder 14 is sent down from the opened hatch 13, so that the worker moves onto a working platform 5.

53. 发明专利

JPH05134069A FUEL ASSEMBLY AND MIXED OXIDE FUEL ROD 失效
公开(公告)号：JPH05134069A
公开(公告)日：1993-05-28
申请号：JP29439191
申请日：1991-11-11
申请人： HITACHI LTD
发明人： TADA NOBUO
IPC分类号： G21C3/16 , G21C3/328 , G21C3/62
摘要： PURPOSE:To prevent an excessive rise in the internal pressure of a fuel rod even when burning is made to a high burnup and thereby to maintain the soundness of fuel without causing an economic disadvantage such as a rise in the cost of manufacture, in a fuel assembly of a light water reactor containing a mixed oxide fuel rod. CONSTITUTION:A fuel assembly is constructed by assembling mixed oxide fuel rods 2, uranium oxide fuel rods 3 and water rods in the shape of an 8X8 square lattice. The mixed oxide fuel rod 2 is constructed by packing a large number of solid mixed oxide pellets 7 in a cladding tube 6 and by sealing the upper and lower ends hermetically with end plugs 9 and 10 by welding, and a helium gas 11 of about 0.9atm at a room temperature at the time of manufacture is filled in a free space of the tube. The uranium oxide fuel rod 3 has the same dimension in the radial direction as the mixed oxide fuel rod 2 and is constructed by packing a large number of uranium oxide pellets 12 in a cladding tube 6 of the same material as the above and by sealing the upper and lower ends hermetically with the end plugs 9 and 10 by welding, and in the free space thereof, a helium gas 11 of about 5atm at the room temperature at the time of manufacture is filled.

54. 发明专利

JPS6447994A FUEL ASSEMBLY 失效
公开(公告)号：JPS6447994A
公开(公告)日：1989-02-22
申请号：JP20405487
申请日：1987-08-19
申请人： HITACHI LTD
发明人： TADA NOBUO , NAKAJIMA JUNJIRO , IRIBE MAKOTO , YASUJIMA MASAKICHI
IPC分类号： G21C3/33 , G21C3/32
摘要： PURPOSE:To easily discover directional erroneous mounting of fuel rod arrangement and an upper tie plate and previously prevent erroneous loading by forming plural kinds of plural water rod upper end caps engaged with an upper tie plate. CONSTITUTION:A water rod 1a is composed of welding a water rod upper end cap and a water rod lower end cap on the upper and lower ends of a water rod tube 2 in which water flows. A water rod 1b is composed of the same as the water rod 1a, but tabs for determining an axial direction position of a spacer which holds fuel rod intervals are welded at several places. The end shape of a water rod upper end cap 3a of the water rod 1a of non-tab is circular and the end shape of the water rod upper end cap 3b of the water rod 1b with the tabs is flat. The cross section shape of a water rod lower end cap 4a of the water rod 1a is circular and the cross section shape of a water rod lower end cap 4b of the water rod 1b with the tabs is square.

55. 发明专利

JPS636493A CHANNEL BOX FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS636493A
公开(公告)日：1988-01-12
申请号：JP14945686
申请日：1986-06-27
申请人： HITACHI LTD
发明人： TADA NOBUO , NAKAJIMA JUNJIRO
IPC分类号： G21C3/324 , G21C3/30

56. 发明专利

JPS62148886A FUEL AGGREGATE 失效
公开(公告)号：JPS62148886A
公开(公告)日：1987-07-02
申请号：JP28924185
申请日：1985-12-24
申请人： HITACHI LTD
发明人： YANAGI YOSHIHIKO , TADA NOBUO , NAKAJIMA JUNJIRO
IPC分类号： G21C3/30 , G21C3/324 , G21C3/33

57. 发明专利

JPS62102184A SEGMENT FUEL ROD 失效
公开(公告)号：JPS62102184A
公开(公告)日：1987-05-12
申请号：JP24147885
申请日：1985-10-30
申请人： HITACHI LTD
发明人： TADA NOBUO
IPC分类号： G21C3/28 , G21C3/10

58. 发明专利

JPS61159189A CONTROL ROD FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS61159189A
公开(公告)日：1986-07-18
申请号：JP27970284
申请日：1984-12-29
申请人： HITACHI LTD
发明人： TADA NOBUO , MARU AKIRA , SAITO SOZO , MOCHIDA TAKAAKI
IPC分类号： G21C7/10

59. 发明专利

JPS6166188A Control rod for nuclear reactor 失效
公开(公告)号：JPS6166188A
公开(公告)日：1986-04-04
申请号：JP18795484
申请日：1984-09-10
申请人： Hitachi Ltd
发明人： YOSHIDA SUMI , TAKASE IWAO , IKEDA SHINZO , MASAOKA ISAO , TADA NOBUO
IPC分类号： C22C27/00 , C23C10/28 , C23C10/52 , G21C7/10
CPC分类号： Y02E30/39

60. 发明专利

JPS6046488A CONTROL ROD FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS6046488A
公开(公告)日：1985-03-13
申请号：JP15321283
申请日：1983-08-24
申请人： HITACHI LTD
发明人： TADA NOBUO , MARU AKIRA , OOWADA MASATAKA
IPC分类号： G21C7/113 , G21C7/10

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式