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1. 发明专利

JP2000135677A ABRASIVE WATER JET CUTTING METHOD 失效
公开(公告)号：JP2000135677A
公开(公告)日：2000-05-16
申请号：JP30983798
申请日：1998-10-30
申请人： HITACHI LTD , HITACHI KISOU KK
发明人： KUROSAWA KOICHI , TADA NOBUO , ONO SHIGEKI , SUGAWARA NOBUHIKO , NISHINO MASAYUKI
IPC分类号： B24C1/00 , B24C9/00 , B24C11/00 , B26F3/00 , G21C19/02
摘要： PROBLEM TO BE SOLVED: To prevent the deterioration of an underwater environment of abrasive water jet cutting work by removing a stain of the abrasive surface being an abrasive, and using a clean abrasive. SOLUTION: In an abrasive, refuse and oxide films sticking to the abrasive outside surface are preremoved by an abrasive cleaning unit 4. These refuse, etc., are accumulated in a waste liquid tank 7 by a waste liquid line 8. Only a cleaned abrasive is fed to an abrasive supply unit 3 through an abrasive supply line 6 to be jetted out to a cutting object 14 together with water pressurized by an extra-high pressure pump 2 from an abrasive nozzle 1. Thus, since the refuse of the abrasive is preremoved, pollution of water in a tank 13 can be improved more than when the abrasive is not cleaned. The abrasive cleaning unit 4 is incorporated into a cutting system, but an abrasive precleaned by another unit can be fed to the abrasive supply unit 3.

2. 发明专利

JP2006023087A Reactor building and pollution prevention device in it 审中-公开
标题翻译：其中的反应堆建筑和污染防治设备
公开(公告)号：JP2006023087A
公开(公告)日：2006-01-26
申请号：JP2004198903
申请日：2004-07-06
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KUWABARA TAKASHI , ONO SHIGEKI , OGOSHI SHIGERU , KANAI EITETSU
IPC分类号： G21F9/00 , G21C13/00 , G21C13/10
CPC分类号： Y02E30/40
摘要： PROBLEM TO BE SOLVED: To provide a reactor building which can facilitate decontamination work by preventing radioactive substances from adhering to ceiling beams even if the floating of the radioactive substances occurs during a periodic inspection.
SOLUTION: This invention prevents the radioactive substances from adhering to the ceiling beams 10 by covering the ceiling beams 10 of a working area 7 in the reactor building 1 with adhesion prevention means (14 and 27). Such a constitution eliminates the adhesion of the radioactive substances to the ceiling beams 10 and makes it possible to omit decontamination work for the ceiling beams 10.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种反应堆建筑物，即使在定期检查期间发生放射性物质的漂浮，也可以通过防止放射性物质粘附到天花板梁上来促进去污作业。解决方案：本发明通过用防粘合装置（14和27）覆盖反应堆1中的工作区域7的天花板梁10来防止放射性物质附着在天花板梁10上。这样的结构消除了放射性物质对天花板梁10的粘附，并且可以省略天花板梁10的净化作业。（C）版权所有（C）2006，JPO＆NCIPI

3. 发明专利

JP2001116881A RADIATION SHIELD 失效
公开(公告)号：JP2001116881A
公开(公告)日：2001-04-27
申请号：JP29338999
申请日：1999-10-15
申请人： HITACHI LTD
发明人： ONO SHIGEKI , TADA NOBUO , SAITO HIDEYO , KINOSHITA HIROBUMI , YAMADA MASAO , KUROSAWA KOICHI
IPC分类号： G21F1/08 , G21F3/00
摘要： PROBLEM TO BE SOLVED: To provide an appropriate material from which a large radiation shield with a high shielding capability can be formed. SOLUTION: A sintered tungsten based alloy of high specific gravity is enclosed in a sheath made of metal or the like to form the radiation shield. The radiation shield having a high shielding capability and being of a large size can be manufactured.

4. 发明专利

JP2000304890A REACTOR INTERNAL STRUCTURE REPLACING METHOD 失效
公开(公告)号：JP2000304890A
公开(公告)日：2000-11-02
申请号：JP11045799
申请日：1999-04-19
申请人： HITACHI LTD
发明人： TADA NOBUO , MAEDA MINORU , ONO SHIGEKI
IPC分类号： G21C19/02 , G21F9/30
摘要： PROBLEM TO BE SOLVED: To easily reduce a stress corrosion crack potential in a comparatively short time by replacing a shroud module with one made of an excellent material with a shroud upper body integrated. SOLUTION: A nuclear reactor pressure vessel upper lid 22 and a steam drier 15 are removed from a nuclear reactor pressure vessel 1, a steam separator serving as a shroud head 16 is removed, and then, a fuel 10 is taken out. Subsequently, a dry tube LPRM detector assembly 25 is removed, a water-supply sparger 13 and a reactor spray system pipe 12 arranged above a reactor shroud 2 are cut so as to be removed. Then, an upper grid board 5 is removed, a shroud upper body is cut and removed, and preventive maintenance work inside the nuclear reactor pressure vessel 1 is carried out. Then, the shroud upper body is installed and the upper gird board is mounted. A new guide rod, a new water-supply sparger, a new reactor spray pipe are installed, a new dry tube LPRM detector assembly is arranged, the fuel 10 is charged, the steam separator serving as a shroud head 16 and the steam drier 15 are mounted, and finally, the reactor pressure vessel upper lid 22 is installed.

5. 发明专利

JPH1043952A ROTATING ELECTRIC DISCHARGE MACHINING METHOD AND DEVICE THEREFOR 失效
公开(公告)号：JPH1043952A
公开(公告)日：1998-02-17
申请号：JP20560296
申请日：1996-08-05
申请人： HITACHI LTD
发明人： MUTO HIROSHI , SHIMURA TAKAO , OMORI SHINYA , YOSHIDA TOMOYA , TADA NOBUO , ITO MASATO , ONO SHIGEKI
IPC分类号： G21C19/02 , B23H7/12 , G21F9/30
摘要： PROBLEM TO BE SOLVED: To facilitate the discharge of sludge and perform a stable electric discharge machining even under a specific environment within a unclear reactor by generating a flow in the fluid between a rotating electrode and a workpiece. SOLUTION: A rotating electric discharge machining device is set on a structure to be cut within a reactor pressure vessel by underwater remote control, and the electric discharge machining device is connected to an electric discharge machining power source temporarily set on the sixth floor of a reactor building through a feed cable. When a workpiece 2 is cut, the electric discharge machining power source temporarily set on the sixth floor of the reactor building is remotely operated, whereby the workpiece 2 is cut while continuously normally rotating or reversely rotating the electrode 1 during cutting. Therefore, a flow shown by an arrow 3 is generated in the reactor water between the electrode 1 and the workpiece 2. The sludge generated in electric discharge machining is forcedly discharged to the outside from the working part by the flow 3 of the reactor water.

6. 发明专利

JPH08243752A WELDING METHOD FOR STAINLESS STEEL CONTAINING HE 失效
公开(公告)号：JPH08243752A
公开(公告)日：1996-09-24
申请号：JP5396495
申请日：1995-03-14
申请人： HITACHI LTD
发明人： SUZUKI YUTAKA , HASHIMOTO MOTOYUKI , SHIGENAKA NAOTO , ONO SHIGEKI
IPC分类号： G21C19/02 , B23K9/23 , B23K9/235 , B23K31/00 , C22C38/00
摘要： PURPOSE: To enable welding of stainless steel containing He by performing a flaw introduction and heat input on the stainless steel before welding, thereby holding He in the grains, suppressing the inflow into the grain boundary and preventing intercrystalline cracks due to the formation of He bubbles. CONSTITUTION: In the step 101, a flaw introduction is performed by using one or more means from a heat cycle, mechanical stress induction, mechanical impact addition and ion irradiation. In the step 102, a heat input before welding is performed by using one or more means from RF heating, laser irradiation and electric heating. In the step 103, welding is performed after He is held in the grains by the flaw introduction and the heat input before welding. Thus, the welding of the stainless steel containing He is performed without causing intercrystalline cracks, thereby reducing the repair cost of the components of a nuclear reactor as well as the repair period.

7. 发明专利

JPH062103A METHOD FOR WORKING ZIRCONIUM ALLOY 失效
公开(公告)号：JPH062103A
公开(公告)日：1994-01-11
申请号：JP15777492
申请日：1992-06-17
申请人： HITACHI LTD
发明人： ONO SHIGEKI
IPC分类号： C01B13/14 , C01G25/02 , C23C8/16 , C23C10/02
摘要： PURPOSE:To prevent the cracking in a film and to improve corrosion resistance by forming a surface oxide film on a zirconium alloy into partially stabilized zirconia by using an ion beam mixing method. CONSTITUTION:This zirconia alloy can be prepared by vapor-depositing 1 Ca or Y onto a zirconium alloy substrate 2 and irradiating the above with Fe ions 3 to mix the vapor deposited film 1 and the substrate 2 and to form the surface into partially stabilized zirconia 5 in an oxidizing atmosphere. By this method, the occurrence of crack in the oxide film can be prevented and corrosion resistance can be improved.

8. 发明专利

JPH0481643A ENERGY DISPERSION TYPE X-RAY MICROANALYZER 失效
公开(公告)号：JPH0481643A
公开(公告)日：1992-03-16
申请号：JP19491990
申请日：1990-07-25
申请人： HITACHI LTD
发明人： ONO SHIGEKI , SHIGENAKA NAOTO , SUZUKI SADAJI
IPC分类号： G01N23/22 , G01T1/24 , G01T7/00 , H01J37/244 , H01J37/252
摘要： PURPOSE:To obtain an apparatus not limiting the use condition of an electron microscope even when a sample is heated to 400 deg.C or higher by providing a shutter cutting off infrared rays between a semiconductor detector and a sample. CONSTITUTION:The temp. of a sample 7 is controlled by the heater of a sample support means 8 and infrared rays are allowed to be incident to a semiconductor detector 3 along with characteristic X-rays. The temp. rise of the detector 3 by infrared rays is measured by a semiconductor temp. measuring means 10. When the temp. of the semiconductor detector 3 becomes threshold temp., a signal is transmitted to the drive mechanism 5 of a shutter 6 by the signal processing means 4 of the temp. measuring means 10 and the shutter 6 is closed and the detector 3 is not heated by radiant heat. The shutter 6 is opened when the temp. of the detector 3 becomes the threshold temp. or lower. By this constitution, an energy dispersion type X-ray microanalyzer not limiting the use of an electron microscope even when the sample is heated to 400 deg.C or higher is obtained.

9. 发明专利

JP2001242278A CONSTRUCTION METHOD FOR REINFORCING REACTOR CORE SPRAY SPAGER 失效
公开(公告)号：JP2001242278A
公开(公告)日：2001-09-07
申请号：JP2000055955
申请日：2000-02-28
申请人： HITACHI LTD
发明人： ONO SHIGEKI , TADA NOBUO , MAEDA MINORU
IPC分类号： G21C15/02 , G21C15/18 , G21C19/00
摘要： PROBLEM TO BE SOLVED: To provide a method for easily reinforcing end plates of a reactor core spray sparger which is a reactor inner structure of a boiling water type nuclear power plant. SOLUTION: A support for supporting the end plates is installed between the end plates facing each other. The end plates of the reactor core spray sparger can thereby be reinforced easily.

10. 发明专利

JPH10111385A HANDLING METHOD OF EQUIPMENT IN NUCLEAR REACTOR PRESSURE VESSEL 失效
公开(公告)号：JPH10111385A
公开(公告)日：1998-04-28
申请号：JP26275096
申请日：1996-10-03
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： FURUKAWA HIDEYASU , TADA NOBUO , ONO SHIGEKI , BUSHI SATORU
IPC分类号： G21C19/02
摘要： PROBLEM TO BE SOLVED: To enable additional work requiring the use of an overhead crane in parallel by performing the work of hanging or carrying out the equipment in a pressure vessel while using a lifting facility where a leg part is erected on a nuclear reactor pressure vessel flange face. SOLUTION: When performing the work of hanging or carrying out equipment 2 in a nuclear reactor pressure vessel 1, a lifting facility where a leg part 3a is erected on a top face of a pressure vessel flange 1a is placed. A guide 3b of the leg part 3a is placed inside of the pressure vessel 1. The lifting facility is composed of a chain block 3c, a wire 3d, a hanger 3e, and a metal hanger 3f, and the metal hanger 3f is hung by an overhead crane and placed on the top face of the pressure vessel flange 1a. After installation, hanging work can be done with the chain block 3c so that the work can be done independent on the overhead crane. Thereby, the occupation of the overhead crane due to the hanging work or the carrying-out work of the structure in the nuclear reactor is eliminated, so that a process can be shortened.

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