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11. 发明专利

JP2001343481A CRACK DIAGNOSTIC METHOD FOR REACTOR CORE INTERNAL STRUCTURE 失效
公开(公告)号：JP2001343481A
公开(公告)日：2001-12-14
申请号：JP2001097951
申请日：2001-03-30
申请人： HITACHI LTD
发明人： YAMASHITA YOSHIHIRO , FUSE MOTOMASA , MATSUI TETSUYA , SAKAI TAKAO
IPC分类号： G01B11/30 , G01B17/00 , G01M7/02 , G01N21/91 , G01N21/95 , G01N29/00 , G01N29/12 , G21C17/003
摘要： PROBLEM TO BE SOLVED: To provide a crack diagnostic method for reactor core internal structure, capable of totally diagnosing cracks on the core internal surface remotely and in non-contact manner and reducing the exposure dose of workers and drastically reducing work man-hours. SOLUTION: A surface wave is generated on the surface of reactor core internal structure, a laser light is cast on the surface and based on the speckle pattern of laser holography that reflection light from the surface forms, cracks existing on the surface of the core internals are surveyed.

12. 发明专利

JPH0659091A TEMPERATURE CONTROL TYPE MATERIAL IRRADIATION DEVICE 失效
公开(公告)号：JPH0659091A
公开(公告)日：1994-03-04
申请号：JP21033992
申请日：1992-08-06
申请人： HITACHI LTD
发明人： YAMASHITA YOSHIHIRO , MADOKORO MANABU
IPC分类号： G21C23/00
摘要： PURPOSE:To provide a temperature control type material irradiation device to maintain the radiation temperature of an irradiation sample set in a reactor core at a constant level at the time of variation of reactor core output. CONSTITUTION:This is constituted of an inner cylindrical pipe 6 furnished with a piping to let sodium flow in and out of the piping by way holding an irradiation sample 7 and an outer cylindrical pipe 4 furnished with a piping storing the inner cylindrical pipe 6 with a gas gap 5 and to let cooling gas filled in the gas gap 5 flow in and out of the piping, and the coefficient of thermal expansion of the material of the inner cylindrical pipe 6 is made larger than that of the outer cylindrical pipe 4. As temperature change of the gas gap 5 controls refrigeration and compensates temperature change of the irradiation sample 7 at the time of variation of reactor core output, it is possible to maintain the temperature of a constantly irradiated sample to a roughly constant level without any time lag.

14. 发明专利

JP2000280087A DEVICE AND METHOD OF UNDERWATER LASER WELDING 失效
公开(公告)号：JP2000280087A
公开(公告)日：2000-10-10
申请号：JP8780599
申请日：1999-03-30
申请人： HITACHI LTD
发明人： YAMASHITA YOSHIHIRO , KATO TAKAHIKO , KOSHIISHI MASATO
IPC分类号： B23K26/12 , G21C19/02
摘要： PROBLEM TO BE SOLVED: To form a dry spot space with not only gas but also water for enabling laser welding in water by spraying water to form a water curtain from a circumference of a gas shield nozzle for spraying shield gas, which is coaxial with a laser light to be radiated to a welding part. SOLUTION: At a tip of a laser torch, a gas shield nozzle and a water shield nozzle are arranged coaxially with an optical axis of a laser light 8. Shield gas injected from a gas injection port 7 is emitted to a welding part 9 at the same time when the laser light 8 is radiated. Simultaneously, an annular gap between a gas shield nozzle outer wall and a water shield nozzle inner wall is covered with a water curtain 10 formed with the water injected from a water injection port 6. A gas space of a conical dry spot is formed by a membrane force of the water curtain 10 and shield gas pressure so as to cover the welding part. By the gas space, laser welding can be done in the water under the condition equivalent to that in the atmosphere.

17. 发明专利

JPS6054724A WASTE GAS DEHUMIDIFICATION TOWER 失效
公开(公告)号：JPS6054724A
公开(公告)日：1985-03-29
申请号：JP16312483
申请日：1983-09-07
申请人： HITACHI LTD
发明人： YAMASHITA YOSHIHIRO , SEKI KATSUZOU , SAKATA YUUJI
IPC分类号： B01D53/26
摘要： PURPOSE:To make the structure simpler by eliminating baffles and to improve maintenance by remodelling a dehumidification tower for waste gas to a structure wherein a discharge port of dehumidifying agent is eliminated and charge and discharge of dehumidifying agent are executed through a charging port of the dehumidifying agent. CONSTITUTION:An outlet nozzle 2 for waste gas and a charging port 3 for the dehumidifying agent are provided to the top of a main body of a dehumidification tower for waste gas having a vertical cylindrical structure, and an inlet nozzle 1 is provided to the bottom of the main body. Thus, baffles and discharge port of the dehumidifying agent are eliminated. In the stage of exchanging the dehumidifying agent, a cover 5 of the charging port 3 of the dehumidifying agent is removed and the dehumidifying agent is sucked out by using a vacuum sucking machine, and fresh dehumidifying agent is charged. By the use of the dehumidification tower for waste gas, scattering of dehumidifying agent is retarded and operability is improved.

19. 发明专利

JPH05341089A 失效
公开(公告)号：JPH05341089A
公开(公告)日：1993-12-24
申请号：JP14928892
申请日：1992-06-09
申请人： HITACHI LTD
发明人： YAMASHITA YOSHIHIRO , MADOKORO MANABU , SATO HARUO
IPC分类号： G21C23/00
摘要： PURPOSE:To provide a temp. controlled material irradiation device, with which the soundness of the structure of an inner cylinder tube is well secured even though its plate thickness is small and temp. control of the be can be done smoothly. CONSTITUTION:In connection with an inner cylinder tube 6, a sodium flowout pipe 9 is installed through which sodium 12 in the inner cylinder tube 6 flows out from its over-part, and this sodium flowout pipe 9 is extended to inside of the inner cylinder tube 6 to form a sodium flowout pipe extension part 13 so that a sodium liquid surface 12 is formed within the tube 6. A gas storage 14 for inert gas is provided in the space bounded by the sodium liquid surface 12 and the inner wall surface of the upper part of the inner cylinder tube 6.

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