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1. 发明专利

JPH08105990A INSTALLATION METHOD FOR STRUCTURE IN NUCLEAR REACTOR, NUCLEAR REACTOR SHROUD WELDER THEREFOR, AND NUCLEAR REACTOR COMBINATION SHROUD HANGER AND CORE MEASURING DEVICE THEREFORE 失效
公开(公告)号：JPH08105990A
公开(公告)日：1996-04-23
申请号：JP24102394
申请日：1994-10-05
申请人： HITACHI LTD , BABCOCK HITACHI KK , HITACHI NUCLEAR ENG
发明人： KUROSAWA KOICHI , FURUKAWA HIDEYASU , CHIBA ISAO , KIKUCHI TOSHIICHI , MANABE FUMIO , KONDO YOSHIHIDE
IPC分类号： G21C13/00 , G21C19/02
摘要： PURPOSE: To shorten an installation work period for a structure in a nuclear reactor and reduce a worker's exposure to radiation by preliminarily building each component such as a core support plate and a guide plate into a shroud, and transporting the assembled structure into a nuclear reactor pressure vessel. CONSTITUTION: Each component such as core support plates 5, guide tubes 9 and guide tube stabilizers 10 is preliminarily built into a shroud 4, and transported into a nuclear reactor pressure vessel 1, together with the shroud 4. In other words, before the shroud 4 is transported into the vessel 1, the guide tubes 9 are inserted in the holes of the plates 5 built into the shroud 4 and fastened with the stabilizers 10. The tubes 9 are thereby fastened to the plates 5 temporarily. In this case, the tubes 9 are jointed to each other horizontally with bolts 18 and the stabilizers 10. The structure so assembled is transported into the vessel 1. As a result, an installation work period for the shroud 4 and the guide tubes 9 can be shortened by using a shroud welder, a guide tube welder or the like formed out of a plurality of welding heads.

2. 发明专利

JP2000266886A REPLACING METHOD FOR JET PUMP RISER PIPE AND ITS DEVICE 失效
公开(公告)号：JP2000266886A
公开(公告)日：2000-09-29
申请号：JP7577399
申请日：1999-03-19
申请人： HITACHI LTD , HITACHI NUCLEAR ENG , HITACHI KISOU KK , HESUKO TECHNOLOGY KK
发明人： KUROSAWA KOICHI , NISHINO MASAYUKI , OTAKA MINORU , FUKUMITSU HARUMASA , KIHARA SUMIHIDE , TSUJIMURA HIROSHI , CHIBA ISAO , SATO KIKIYO
IPC分类号： G21C19/02
摘要： PROBLEM TO BE SOLVED: To replace a jet pump riser pipe in a short time and efficiently by installing a combined jet pump riser pipe combining a riser pipe, a riser brace, a riser bracket, thermal sleeve, etc., to a jet pump riser pipe replacing device. SOLUTION: In a replacing method of a jet pump riser pipe 1 consisting of a pressure vessel 8 provided with a recirculation inlet nozzle 11, a nozzle safe end 9 attached to the nozzle and a thermal sleeve 2 on one end and attaching the riser pipe to the recirculation water inlet nozzle, the thermal sleeve, a jet pump riser brace and a jet pump riser bracket are attached outside the reactor pressure vessel, then the jet pump riser pipe is inserted in the reactor pressure vessel the jet pump thermal sleeve is attached to the nozzle safe end and the jet pump riser brace is attached to the reactor pressure vessel by way of a riser brace pad 10 formed on the inner wall of the pressure vessel.

3. 发明专利

JPH0868889A REPLACING METHOD FOR REACTOR INTERNAL STRUCTURE 失效
公开(公告)号：JPH0868889A
公开(公告)日：1996-03-12
申请号：JP20634194
申请日：1994-08-31
申请人： HITACHI LTD , HITACHI KISOU KK
发明人： KUROSAWA KOICHI , CHIBA ISAO , CHIBA NOBORU , FURUKAWA HIDEYASU , TAKADA HIROSHI
IPC分类号： G21C19/02 , G21C13/00
摘要： PURPOSE: To reduce exposure dose of workers and replace structure easily, reliably and in a short time by removing the radioactivated in-reactor structure in full water state of reactor well and placing new structure after draining the reactor water and placing shielding in the core region. CONSTITUTION: For reducing the exposure of workers, the reactor well is filled with reactor water in the reactor water state maintained at the flange lower end level and such core components as core shroud 16, core support plate 24, jet pump 30 etc., are removed by cutting with a remote control under-water cutting device and special tools. Then, the reactor water is drained out with decontamiming the vessel 1 inside using high pressure water and notched shieldings 43 or separated shieldings are placed in the range including the core region to prepare the atmosphere available of recovery work. By using a gondola 44 and approaching to the recovery location, remaining stress around each welding part is bettered with high pressure water in the marginal space, the surface is refurbished with new material with good corrosion resistivity and new core component is directly fixed in the same method as that for plant construction case.

4. 发明专利

JPS56104283A EXCHANGING DEVICE FOR CONTROL ROD DRIVE MECHANISM 失效
公开(公告)号：JPS56104283A
公开(公告)日：1981-08-19
申请号：JP682680
申请日：1980-01-25
申请人： HITACHI LTD
发明人： ISHII YOSHIMI , YOSHIDA TOMIJI , CHIBA ISAO
IPC分类号： G21C19/20 , G21C7/12

5. 发明专利

JPH05162972A AUTOMATIC HORIZONTAL-DEGREE ADJUSTING DEVICE 失效
公开(公告)号：JPH05162972A
公开(公告)日：1993-06-29
申请号：JP33472791
申请日：1991-12-18
申请人： HITACHI LTD
发明人： CHIBA ISAO , KOMATSU KIHACHIRO , NEYA TAKEO
IPC分类号： B66C1/10 , B66C13/08 , B66C13/22 , B66C13/46
摘要： PURPOSE:To provide an automatic horizontal-degree adjusting device which can operate safely and efficiently without requiring skillfulness even for any load having a complicate shape.. CONSTITUTION:When a product 11 is suspended up by a suspension sling 1 and shifted, the horizontal degree of a suspended load is measured by a several number of horizontal sensors 12 and distance sensors 8, and each measurement value is sent into a control panel 9, and an electromagnetic clutch 5 is operated, and a balancer 7 is shift-set through an electric motor 2, and the horizontal degree of the suspended load is automatically adjusted.

6. 发明专利

JPH10282290A METHOD FOR REPAIRING JET PUMP IN BOILING WATER REACTOR AND WORK FRAME 失效
公开(公告)号：JPH10282290A
公开(公告)日：1998-10-23
申请号：JP9095497
申请日：1997-04-09
申请人： HITACHI LTD
发明人： KUROSAWA KOICHI , OTAKA MINORU , ITO MASATO , CHIBA ISAO
IPC分类号： G21C19/02
摘要： PROBLEM TO BE SOLVED: To make it possible to replace a jet pump efficiently in a short time by installing a work frame in a reactor pressure vessel after carrying out core- area equipment such as a jet pump. SOLUTION: As to a work frame 1 fixed to a base 4 on an empty control rod drive mechanism housing 3 in a reactor pressure vessel 2, each of working platforms 8 to 11 is provided for each work level and each of holes 12 to 15 is bored in each of the working platforms 8 to 11 in order to allow workers to move to each of the work floors 8 to 11 with ladders 16. In a centering mechanism 17 of the work frame 1, the center of the reactor pressure vessel 2 is aligned with that of the work frame 1 by a pendulum 18 and radically mounted antivibration arms 21 prevent the work frame 1 from rolling and stably fix it in the central position. Then, work arms 29 and 30 and those 33 and 34 on the opposite side grasp and move riser pipes 28 and diffusers in simultaneous work and a centering mechanism 20, for example, sets the center of brackets of the riser pipes 28 at the position coincident with the lower end of a pendulum 25 or a line 26. This makes it possible to replace a jet pump equipped with riser pipes and the like efficiently in a short period.

7. 发明专利

JPH08278391A IN-WATER TRANSPORTATION METHOD AND DEVICE FOR REACTOR STRUCTURE CUT-PIECE 失效
公开(公告)号：JPH08278391A
公开(公告)日：1996-10-22
申请号：JP8363495
申请日：1995-04-10
申请人： HITACHI LTD , HITACHI KISOU KK
发明人： KUROSAWA KOICHI , CHIBA NOBORU , CHIBA ISAO , TAKADA HIROSHI , FURUKAWA HIDEYASU
IPC分类号： G21C19/02 , B63B35/00
摘要： PURPOSE: To attain transporting in water reactor structure cut-pieces cut out of a reactor pressure vessel relatively easily and stably to a specified position at the time of exchanging reactor structure of reactor pressure vessel. CONSTITUTION: Transportation of cut-pieces 4 fo reactor structure cut out of a reactor pressure vessel is conducted with a wire rope 5, a winding drum 41, a chain 40 and a grasping tool 7 connected from a winch 6. By driving the winch 6 and the chain 40, the wire rope 5 is wound on the winding drum 41 to lift up. The pieces are freely moved on the water surface 12 by the propeller 8 of the transportation machine 1 and transported in water to a specific cask. To contain in the cask, the cut pieces 4 are lift down in the cask and the handling is released.

8. 发明专利

JPS6136637B2 失效
公开(公告)号：JPS6136637B2
公开(公告)日：1986-08-19
申请号：JP682680
申请日：1980-01-25
申请人： HITACHI LTD
发明人： ISHII YOSHIMI , YOSHIDA TOMIJI , CHIBA ISAO
IPC分类号： G21C19/20 , G21C7/12

9. 发明专利

JPH08240693A METHOD FOR REMOVAL AND CUTTING OF STRUCTURE AT INSIDE OF REACTOR PRESSURE VESSEL 失效
公开(公告)号：JPH08240693A
公开(公告)日：1996-09-17
申请号：JP4299295
申请日：1995-03-02
申请人： HITACHI LTD
发明人： KUROSAWA KOICHI , FURUKAWA HIDEYASU , TAKADA HIROSHI , KIKUCHI KOJI , CHIBA ISAO , KIHARA SUMIHIDE
IPC分类号： G21C19/02 , G21F9/30
摘要： PURPOSE: To provide a removal method, of a structure inside a reactor pressure vessel, in which the cut pieces of the structure inside a nuclear reactor such as a shroud or the like are carried out comparatively easily to the outside of the nuclear reactor including a shielding container into which the cut pieces have been packed, in which the time required to a cutting operation can be shortened and in which the radiation exposure of an operator engaged in the cutting operation can be reduced and to provide a cutting method of the structure inside the reactor pressure vessel. CONSTITUTION: In the removal method of a structure 2 inside a reactor pressure vessel 1, the structure 2 inside the reactor pressure vessel is cut, and its cut pieces are packed into a container so as to be carried out to the outside of a nuclear reactor. In the removal method, water is filled into the reactor pressure vessel 1 and into a reactor well 3, the structure 2 inside the nuclear reactor is cut coarsely inside the reactor pressure vessel 1, the cut pieces are carried into the reactor well 3 so as to be cut fine additionally inside the reactor well 3, and the cut pieces are packed into the container 27 so as to be carried out to the outside of the nuclear reactor.

10. 发明专利

JPH08194085A SHROUD SUSPENDING METHOD FOR NUCLEAR REACTOR AND SHROUD STRUCTURE 失效
公开(公告)号：JPH08194085A
公开(公告)日：1996-07-30
申请号：JP694095
申请日：1995-01-20
申请人： HITACHI LTD
发明人： TAKADA HIROSHI , KUROSAWA KOICHI , ITO MASATO , CHIBA ISAO , UOYUKI HIROTO , TSUJIMURA HIROSHI
IPC分类号： G21C13/00
摘要： PURPOSE: To unitedly convey a newly manufactured shroud into a nuclear reactor in replacement work of shrouds which is carried out during the period of in-service. CONSTITUTION: In a nuclear power plant in which a ceiling crane 4 in a work floor has too small raising force to unitedly suspend the shroud 1 while the balance 3 being installed above the shroud 1 by installing a block 2 to install a balance 3 to suspend a shroud 1 in the inside of a shroud 1 and installing the suspension balance 3 in the inside of the shroud 1 through the block 2; the shroud 1 is made possible to be conveyed unitedly. Consequently, with the raising force 6 smaller than that of a conventional method by the suspension balance installed above the shroud 1, the shroud can be suspended and conveyed unitedly and in shroud replacement work during the period of in-service, united shroud convey can be carried out easily.

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