专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH06324171A WATER ROD HOLDING MECHANISM AND WATER ROD AND FUEL ASSEMBLY 失效
公开(公告)号：JPH06324171A
公开(公告)日：1994-11-25
申请号：JP11308993
申请日：1993-05-14
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NANNICHI MICHIHIRO , TAKENAKA MASAO , FUKUMOTO TAKASHI , UMEHARA HAJIME , NAKAJIMA JUNJIRO , YASUJIMA MASAKICHI , AIZAWA YASUHIRO
IPC分类号： G21C3/30 , G21C3/33
摘要： PURPOSE:To provide a water rod holding mechanism by which spectrum shift operation becomes possible in a simple structure while maintaining mechanical soundness of an ascending pipe and a descending pipe and while preventing a rise in a wall temperature. CONSTITUTION:A holding mechanism 14 supports a small diameter pipe 4 movably slidingly freely in the vertical direction by the projecting parts 16p1, 16p2 and 16q1 of a slidingly movable ring 16, the elastic parts 16a1 and 16a2 of the slidingly movable ring 16 and a slidingly movable V shape surface 15b of the connecting part 15, and the slidingly movable ring 16 and a large diameter pipe 3 are fixed in the horizontal direction to each other by the connecting part 15. Thereby, even if the axial directional radiation growth quantities of the small diameter pipe 4 and the large diameter pipe 3 become different from each other and the small diameter pipe 4 expands and contracts relatively in the vertical direction to the large diameter pipe 3, since the small diameter pipe 4 can move slidingly easily in the vertical direction, buckling and deflection by compression stress or a crack and breakage by tensile stress can be prevented, so that mechanical soundness can be maintained.

2. 发明专利

JPS63151810A APPARATUS FOR MEASURING OXIDE FILM OF FUEL CHANNEL BOX 失效
公开(公告)号：JPS63151810A
公开(公告)日：1988-06-24
申请号：JP29873686
申请日：1986-12-17
申请人： HITACHI LTD
发明人： ISHIZAKI HIDEAKI , NANNICHI MICHIHIRO
IPC分类号： G21C17/06 , G01B21/08
摘要： PURPOSE:To enhance the efficiency of measuring work, by arranging an adhered clad removing mechanism combining fuel channel box (CB) holding function to the CB insert upper position of an oxide film measuring mechanism. CONSTITUTION:A measuring apparatus 10 is constituted of a frame 11, a guide mechanism 12, a clad removing mechanism 13 and the oxide film measuring mechanism 14 arranged to said mechanism 13 on the lower part side thereof. The upper part of the frame is mounted on the curved part of the wall of a used fuel storage pool 15. CB 3 to be measured is inserted in the measuring apparatus 10 through the guide mechanism 12 by a fuel grasping apparatus. Subsequently, when CB 3 passes the removing mechanism 13, the clad adhered to CB 3 is removed by the brush pressed to the surface of CB 3 by a spring. Therefore, the oxide film measuring area of CB 3 inserted up to the position of the measuring mechanism 14 becomes a clad removed state. Next, an eddy current probe is pressed to the measuring area by a remote drive mechanism subjected to remote operation on a floor to measure the oxide film of CB 3.

3. 发明专利

JPH0339694A FUEL ASSEMBLY 失效
公开(公告)号：JPH0339694A
公开(公告)日：1991-02-20
申请号：JP17391289
申请日：1989-07-07
申请人： HITACHI LTD
发明人： NAKAJIMA JUNJIRO , YANAGI YOSHIHIKO , NANNICHI MICHIHIRO , KAWADA YOSHINARI , MARU AKIRA , YASUDA TETSUO
IPC分类号： G21C3/344
摘要： PURPOSE:To surely support fuel rods in radial direction and to facilitate the production of a fuel spacer by improving and setting the structure and function of a looped spring supporting part of a cylindrical body constituting the fuel spacer. CONSTITUTION:A cylindrical member 11 has a C-shaped aperture 15 on the side wall thereof and is formed with a projecting piece 16 which is inserted into the looped spring 14 by the formation of the aperture to support the spring. The projecting piece 16 acts as a spring supporting part and the position X where the projecting piece 16 begins to bend toward the outer side of the cylindrical member 11 intrudes toward the side wall of the cylindrical member 11 from the position of a stopper part 17A in a part of the side wall of the aperture 15 in a circumferential direction. Such formation is enabled by provision of notches 18A, 18B and since the inlet parts of the notches 18A, 18B are narrow in width, the spring 14 cannot pass these parts. The movement of the spring 14 in the circumferential direction of the cylindrical member 11 is limited by the above-mentioned structure and, therefore, the fuel rods are surely supported in a radial direction. Since the position of the projecting piece 16 and the position X are sufficiently apart, the fuel spacer is easily produced.

4. 发明专利

JPH07229997A METHOD FOR MANUFACTURING CONTROL ROD 失效
公开(公告)号：JPH07229997A
公开(公告)日：1995-08-29
申请号：JP2407394
申请日：1994-02-22
申请人： HITACHI LTD
发明人： NANNICHI MICHIHIRO , FUKUMOTO TAKASHI , OGINO KATSUNORI , MACHIDA KOICHI
IPC分类号： G21C21/18 , G21C7/10 , G21C7/113
摘要： PURPOSE:To reduce strain produced at the time when different type tubes are to be welded to each other wherein a blade of a control rod is constituted, to contrive the reduction of a manufacture process of the blade and provide the control rod by which stable operation can be performed without hindering integrity. CONSTITUTION:In the case where many tubes are put side by side, neighboring angular parts in two neighboring different type tubes 1 out of the different type tubes 1 fixed by a different type tube holder are jointed by welding in their angular parts and blades are made, a coolant inflow tube 6 is mounted on one end of respective column-like holes of the two different type tubes 1 having the angular parts of weld objects, a coolant outflow opening 7 is attached to the other end, and welding is performed, as coolant is allowed to flow in the column-like holes from the side of the coolant inflow tube 6.

5. 发明专利

JP2000162373A METHOD AND DEVICE FOR INSPECTING FUEL FRACTURE 失效
公开(公告)号：JP2000162373A
公开(公告)日：2000-06-16
申请号：JP33526898
申请日：1998-11-26
申请人： HITACHI LTD , IBARAKI HITACHI JOHO SERVICE K
发明人： NANNICHI MICHIHIRO , IMAI MASABUMI , IRIBE MAKOTO , FUKUMOTO TAKASHI , MASUHARA YASUHIRO
IPC分类号： G21C17/00 , G21C17/07
摘要： PROBLEM TO BE SOLVED: To judge the presence or absence of the fracture of a fuel assembly by placing an outer cap onto an upper lattice plate, supplying gas inside, lowering a liquid level in an inner cap and that in an outer cap to a specific position, retaining the condition for a specific amount of time, and then gathering cooling water in the inner cap and measuring radioactivity. SOLUTION: The inside of a shipper cap and a system is washed by pure water. The zipper cap is fitted to a fuel assembly to be inspected. The sealed state to the upper lattice part of an outer cap is verified by a seating detection mechanism. Air is supplied from a gas supply source to the outer cap via a gas supply pipe, and the liquid level in the cap is lowered to the height of a cut-out. Temperature before starting soaking is measured by a temperature sensor that is mounted to the inside of a sampling pipe. After retaining for a fixed amount of time, the agitation and concentration of the radiation concentration of cooling water in a fracture fuel assembly is waited for. The cooling water in a channel box is sucked by the sampling pipe and residual pure water in the cap and the system is eliminated. The sample water is sampled and a radioactivity level is measured.

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