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1. 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.

2. 发明专利

DE3776133D1 未知
公开(公告)号：DE3776133D1
公开(公告)日：1992-02-27
申请号：DE3776133
申请日：1987-09-14
申请人： HITACHI LTD
发明人： YOKOMIZO OSAMU , YOSHIMOTO YUICHIRO , KATAOKA YOSHIYUKI , KASHIWAI SHINICHI , MASUHARA YASUHIRO , TOMIYAMA AKIO , ORII AKIHITO , INOUE MURAMATSU , MOCHIDA TAKAAKI , HAYASHI TATSUO
IPC分类号： G21C3/30 , G21C3/32 , G21C3/322 , G21C3/326 , G21C3/328 , G21C7/22 , G21C7/27 , G21C7/32

3. 发明专利

DE3434567A1 未知
公开(公告)号：DE3434567A1
公开(公告)日：1985-04-11
申请号：DE3434567
申请日：1984-09-20
申请人： HITACHI LTD
发明人： UTAMURA MOTOAKI , MASUHARA YASUHIRO , YAMANOUCHI ATSUO , KOTANI KOICHI , NAITOH MASANORI
IPC分类号： G21D3/00 , G21C7/00 , G21D3/08
摘要： A nuclear reactor start-up method of starting up a boiling water reactor which is in the cold shut-down state. The method includes setting a subcooled temperature of a coolant in a reactor core inlet to a range smaller than a critical subcooled temperature which is determined by the condition whereby the coolant starts boiling in the reactor core and the condition whereby the instability due to a periodic variation of buoyancy begins, thereafter starting an increase of power of the reactor.

4. 发明专利

DE3662572D1 REACTOR FUEL ASSEMBLY AND NUCLEAR REACTOR 未知
公开(公告)号：DE3662572D1
公开(公告)日：1989-04-27
申请号：DE3662572
申请日：1986-06-11
申请人： HITACHI LTD
发明人： IKEMURA KAZUYUKI , YOKOMIZO OSAMU , YOSHIMOTO YUICHIRO , HAYASHI TATSUO , KASHIWAI SHINICHI , MASUHARA YASUHIRO , SAKURAI MIKIO , TOMIYAMA AKIO , FUJII TADASHI , SUMIDA ISAO
IPC分类号： G21C1/08 , G21C3/322 , G21C5/06 , G21C15/02 , G21C3/32 , F15D1/00

5. 发明专利

DE3470932D1 PIPING BRANCH STRUCTURE 未知
公开(公告)号：DE3470932D1
公开(公告)日：1988-06-09
申请号：DE3470932
申请日：1984-12-14
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , YOKOMIZO OSAMU , KOTANI KOICHI , KASHIWAI SHINICHI , YOKOYAMA IWAO
IPC分类号： F16L41/08 , F16L41/02 , G21C15/22

6. 发明专利

DE3877230T2 未知
公开(公告)号：DE3877230T2
公开(公告)日：1993-05-27
申请号：DE3877230
申请日：1988-03-17
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , YOKOMIZO OSAMU , INOUE KOTARO , UCHIKAWA SADAO , AOYAMA MOTOO , YAMASHITA JUNICHI , YOSHIMOTO YUICHIRO , YASUDA TETSUO , HIRAKAWA HIROMASA
IPC分类号： G21C3/326 , G21C3/322 , G21C3/328 , G21C3/32

7. 发明专利

DE3877230D1 未知
公开(公告)号：DE3877230D1
公开(公告)日：1993-02-18
申请号：DE3877230
申请日：1988-03-17
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , YOKOMIZO OSAMU , INOUE KOTARO , UCHIKAWA SADAO , AOYAMA MOTOO , YAMASHITA JUNICHI , YOSHIMOTO YUICHIRO , YASUDA TETSUO , HIRAKAWA HIROMASA
IPC分类号： G21C3/326 , G21C3/322 , G21C3/328 , G21C3/32

8. 发明专利

DE4013397A1 未知
公开(公告)号：DE4013397A1
公开(公告)日：1990-10-31
申请号：DE4013397
申请日：1990-04-26
申请人： HITACHI LTD
发明人： ORII AKIHITO , YOKOMIZO OSAMU , MASUHARA YASUHIRO , NISHIDA KOJI , MURATA SHIGETO , KASHIWAI SHIN-ICHI , INOUE KOTARO , YOSHIMOTO YUICHIRO
IPC分类号： G21C3/322 , G21C3/344
摘要： In a fuel assembly having fuel rods inserted into regularly arranged cells of a fuel spacer which keeps the fuel rods correctly spaced from one another and has spacer elements disposed in a plurality of stages in the longitudinal direction of the fuel rods, the fuel spacer comprises vanes formed on the cells in such a manner that each vane is bent from a cut formed in a part of the side wall of the cell. The vanes obliquely project into the corresponding spaces between adjacent fuel rods and allow a coolant flowing through the spaces and forming two-phase flows to generate swirling flows toward the fuel rods. The fuel spacer may alternatively comprise either thin-walled cylinders having built-in vanes or spiral vanes, which are fixed to the spacer that has not been subjected to any direct machining. Also disclosed is a fuel assembly provided with any of the above-described fuel spacers. The arrangement of the present invention enables, while assuring a sufficient strength for maintaining fuel rods in their correct position, the transfer of heat from the fuel rods to the coolant to be promoted so as to raise the allowable power level of the fuel assembly, and enables the void ratio to be lowered so as to increase the reactivity.

9. 发明专利

DE3842775A1 未知
公开(公告)号：DE3842775A1
公开(公告)日：1989-06-29
申请号：DE3842775
申请日：1988-12-19
申请人： HITACHI LTD
发明人： NISHIDA KOJI , YOKOMIZO OSAMU , MASUHARA YASUHIRO , NAKAO TOSHITSUGU , KASHIWAI SHIN-ICHI , TOMIYAMA AKIO , YAMASHITA JUNICHI , HAYASHI TATSUO
IPC分类号： G21C3/328 , G21C7/26 , G21C7/32
摘要： A fuel assembly has a water rod which consists of a coolant ascending path and a coolant descending path, the coolant ascending path opening below a fuel support of a lower tie plate, the coolant descending path opening above the fuel support and adapted to guide downwardly the coolant that has flowed up the coolant ascending path to the upper portion of the water rod. The lateral cross section of the coolant ascending path is more than 25 times that of the coolant descending path. The nuclear reactor with these fuel assemblies loaded in the core is operated as follows. After startup of the reactor when the reactor power is low, all the control rods inserted in the core are withdrawn completely. Then, the reactor power is controlled by regulating a liquid level formed in the water rods. This reactor operation method prolongs the lifetime of the control rods, thereby reducing the number of times they have to be replaced.

10. 发明专利

DE3368478D1 NUCLEAR REACTOR 未知
公开(公告)号：DE3368478D1
公开(公告)日：1987-01-29
申请号：DE3368478
申请日：1983-09-02
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , UTAMURA MOTOAKI , KASHIWAI SHINICHI , YOKOYAMA IWAO , MURATA SHIGETO , NAKAO TOSHITSUGU , MAEDA YUICHIRO
IPC分类号： G21C15/02 , F04D29/44 , G21C1/08 , G21C9/00 , G21C13/10 , G21C15/18 , G21C19/307

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