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11. 发明专利

JPH08226992A METHOD AND DEVICE FOR IMPROVING RESIDUAL STRESS IN REACTOR STRUCTURE 失效
公开(公告)号：JPH08226992A
公开(公告)日：1996-09-03
申请号：JP33202995
申请日：1995-12-20
申请人： HITACHI LTD
发明人： ENOMOTO KUNIO , OTAKA MASAHIRO , KUROSAWA KOICHI , SAITO HIDEYO , TSUJIMURA HIROSHI , TAMAI YASUKATA , URASHIRO KEIICHI , MOCHIZUKI MASATO
IPC分类号： G21C19/02 , B24C1/10 , C21D7/04 , G21C13/036 , G21D1/00
摘要： PURPOSE: To suppress the radioactive contamination of a pump supplying nozzle with water. CONSTITUTION: A nozzle 3 is connected to a high pressure hose 15 connected with a high pressure pump 14. The nozzle 3 is inserted in reactor water in a pressure vessel 33 filled with reactor water. Pure water is pressurized with a high pressure pump 14 and supplied to the nozzle 3 from outside by way of the high pressure hose 15. The flow of pure water discharged from the nozzle 3 and accompanied by cavity is impinged to the surface of reactor structures contacting reactor water. As the pure water is led to the nozzle 3 after pressurized by the high pressure pump 14, radioactive contamination of the high pressure pump 14 is suppressed. Therefore, the maintenance and inspection of the high pressure pump 14 is easily conducted.

12. 发明专利

JPH08200564A COUPLING MADE OF SHAPE MEMORY ALLOY AND METHOD OF USING IT 失效
公开(公告)号：JPH08200564A
公开(公告)日：1996-08-06
申请号：JP950895
申请日：1995-01-25
申请人： HITACHI LTD
发明人： AMANO KAZUO , TADA NOBUO , KATO TAKAHIKO , ENOMOTO KUNIO , OTAKA MASAHIRO , HAYASHI MAKOTO , HATTORI SHIGEO
IPC分类号： F16L13/14 , B21D39/04
摘要： PURPOSE: To provide a coupling made of shape memory alloy, by which a piping is not damaged by the generation and the progress of a crack from a stress concentrating part, and high reliability can be obtained, by providing screw-type protrusions whose torsional directions are opposite to each other at the right and left along the peripheral direction on the right and left inner sides of a liner. CONSTITUTION: A coupling made of shape memory alloy is provided with a shape memory alloy-made driver 1 manufactured by using shape memory alloy, and a liner 2 to be inserted into it, and screw-type protrusions 4a, 4b put along the peripheral direction on the right and left inner sides of the liner 2, and whose torsional directions are opposite to each other are provided on the surface to be brought in contact with the piping to be connected. As a result, the protrusion tips in the screw-type protrusions 4a, 4b of the liner 2 can drastically decrease stress concentration on the pulling side, to be applied to the piping. Therefore, even if the coupling is used in the environment of a nuclear power plant in which stress corrosion crack is to be easily generated, the piping is prevented from being broken.

13. 发明专利

JPH0772121A DETERIORATION INSPECTOR FOR METAL MATERIAL 失效
公开(公告)号：JPH0772121A
公开(公告)日：1995-03-17
申请号：JP15835794
申请日：1994-07-11
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , ENOMOTO KUNIO , HASEGAWA KUNIO , HAYASHI MAKOTO , SHIMIZU TASUKU , TAKAKU KAZUO
IPC分类号： G01N27/72 , G21C17/003
摘要： PURPOSE:To achieve a non-destructive and highly accurate detection of the degree of embrittlement of a machine member made of metal material such as stainless steel containing ferrite used in a high temperature environment. CONSTITUTION:A non-magnetic material filled with a cooling material 13 is arranged to maintain the superconducting sate of a superconducting exciting coil 23 while a container 110 thermally insulated from the outside is disposed on the surface of an object 1 to be measured, the coil 23 is located in the container 110 and a magnetic sensor 31 operable at a low temperature is set at the center of the coil 23. The cooling material 130 is recirculated and magnetic shields 100 and 110 are arranged outside the container 110 and the coil 23. Thus, an intense magnetic field can be obtained with a small exciting coil thereby making diagnosis and evaluation of local deterioration possible.

14. 发明专利

JPH0651084A PREVENTIVE MAINTENANCE METHOD AND DEVICE FOR WELDED PART OF THROUGH PIPE 失效
公开(公告)号：JPH0651084A
公开(公告)日：1994-02-25
申请号：JP7667692
申请日：1992-03-31
申请人： HITACHI LTD
发明人： ENOMOTO KUNIO , OTAKA MASAHIRO , MOCHIZUKI MASATO , SAKATA SHINJI , KUROSAWA KOICHI , SAITO HIDEYO , HAYASHI MAKOTO , HIRANO AKIHIKO
IPC分类号： G21C13/00
摘要： PURPOSE:To enhance the resistance against corrosive cracking due to stresses in a welded part by heating the areas in the neighborhood of the welded part to allow it to attain the high temp. generated in the stress exceeding the yield point, rapidly cooling the inner and outer surfaces with a reactor water, and converting the high tensile residual stresses into compressive stresses. CONSTITUTION:Areas around a welded part 3 including the heat affected zones 6c, 6s of a control rod guide pipe 4 and a stab tube 2 are high temp. heated locally from inside of the guide pipe 4. At the same time as attainment of the high temp., cooling waters 8a, 8s are spouted which use the reactor water from a cooling piece 7s on the outer side and a cooling coil of a heating/cooling piece 5 on the inner surface so that these surfaces are rapidly cooled simultaneously. Accordingly these areas undergo averaging due to redistribution of initial residual stresses and drop of the yield point of the material owing to the high temp. heating, and the residual stresses are dropped. At a stage on the way of this simultaneous rapid cooling of the inner and outer surfaces, compressive stresses are generated in the central part across the plate thickness while tensile stresses are generated at the inner and outer surfaces, and thus yielding is generated. Owing to this tensile yielding at the inner and outer surfaces, compressive stresses remain by contrast after complete cooling. That is, the tensile residual stresses are converted into compressive stresses, which enhances the resistance against corrosive cracking owing to stresses.

15. 发明专利

JPH0578812A FORMATION OF FILM 失效
公开(公告)号：JPH0578812A
公开(公告)日：1993-03-30
申请号：JP24167991
申请日：1991-09-20
申请人： HITACHI LTD
发明人： YAMAMOTO MICHIYOSHI , ENOMOTO KUNIO , URASHIRO KEIICHI , TAMAI YASUKATA , KUROSAWA KOICHI , AOTA KINYA
IPC分类号： C23C4/06 , C23C4/18 , G21C5/00
摘要： PURPOSE:To withstand corrosion by low-temp. sensitizing and to prevent the stress corrosion racking during an operation period by thermally spraying a highly corrosion resistant alloy at a low temp. on the surface of an Fe- and Ni-based alloy member and irradiating the resulted film with a laser, thereby reforming the film. CONSTITUTION:The highly corrosion resistant alloy consisting of the Fe- and Ni-base alloy is thermally sprayed by a low-temp. thermal spraying device 13 on the surface of a member 10 consisting of the Fe- and Ni-base alloy, such as structural members of an atomic power plant deteriorated with age to form the low-temp. thermally sprayed film 12. This film 12 is thermally sprayed with a laser by a laser irradiation device 15 to melt the surface part. This molten part is thereafter resolidified at 10 to 10 deg. C/S cooling rate. The surface reformed layer 14 consisting of a molten and solidified layer of a cell structure having the inter-cell spacing in a 0.2 to 2.0mum range is formed in this way. The structure in the atomic reactor, etc., are repaired in this way and the stress corrosion resistance cracking in weld heat affected zones is improved.

16. 发明专利

JPH0429095A METHOD FOR PRESERVING NEUTRON FLUX MONITOR HOUSING AND HEAT TREATING DEVICE THEREOF 失效
公开(公告)号：JPH0429095A
公开(公告)日：1992-01-31
申请号：JP13480390
申请日：1990-05-24
申请人： HITACHI LTD
发明人： ENOMOTO KUNIO , OTAKA MASAHIRO , HASEGAWA KUNIO , HAYASHI MAKOTO , SAKATA SHINJI , SAITO HIDEYO , KUROSAWA KOICHI , SAITO TAKASHI , KARATSU YOSHINORI , ITO MOTOYA
IPC分类号： G21C19/02 , B23K13/01 , G21C13/00 , G21C13/087 , G21C17/10 , G21C19/20
摘要： PURPOSE:To obtain the residual stresses of compression by inserting the heat treating device which executes induction heating and cooling into the cavity formed by putting a water sealing cap on the top part of the neutron flux monitor housing from under side and executing rapid heating and rapid cooling. CONSTITUTION:The cap 4 which seals the neutron flux monitor housing 3 with water is mounted to the top part of the housing 3. A heating coil 11 and a cooling pipe 12 are installed in the inside of the housing by connecting the coil and the pipe vertically via a connector 15. The cooling pipe 12 is hollow cylindrical double pipes and a bottom plate 12a is provided to the bottom end. A lifting rod 19 rises from the edge of a lower plate 12a and this rod 19 engages with a lifting cylinder 20 so as to hang down. Many nozzle holes 12b are provided on the outer periphery forming the outer part of the double pipes of the cooling pipe 12. Cooling water 23 is injected from the nozzle holes 12b. After the coil 11 is positioned, an AC current is controlled by a power source controller 25 and is supplied from a transformer 13 to the coil 11. An induced current is induced to the inside surface layer of the housing 3 and is heated. The cooling pipe 12 is risen and the cooling water is ejected from the nozzle holes 12b after the stop of the heating.

17. 发明专利

JPH0373607B2 失效
公开(公告)号：JPH0373607B2
公开(公告)日：1991-11-22
申请号：JP899685
申请日：1985-01-23
申请人： HITACHI LTD
发明人： SAKATA SHINJI , SHIMIZU TASUKU , ENOMOTO KUNIO , FUJIMOTO KOJI
IPC分类号： C21D9/00 , C21D9/08 , C21D9/50

18. 发明专利

JPH0278983A MAGNETIC FLUX METER USING SUPERCONDUCTING QUANTUM INTERFERENCE ELEMENT 失效
公开(公告)号：JPH0278983A
公开(公告)日：1990-03-19
申请号：JP23001488
申请日：1988-09-16
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , TAKAKU KAZUO , HASEGAWA KUNIO , ENOMOTO KUNIO , SHIMIZU TASUKU
IPC分类号： G01R33/035 , G01N27/82
摘要： PURPOSE:To reduce performance deterioration by using a superconducting quantum interference element for a magnetic measuring instrument, separating the cryostats of its element part and pickup coil, and coupling both cryostats by a superconducting cable. CONSTITUTION:An exciting coil 2 and the pickup coil part cryostat 52 are arranged on a body 1 to be measured, and the coil 2 and cryostat 52 are scanned in an X-Y-theta direction. The magnetic signal of a magnetic detection side pickup coil 93 is coupled with a SQUID element 91 through the superconducting cable 92 in a flexible tube 60 and measured by a SQUID controller 90. The cable 92 in the tube 60 is sheathed with a magnetic shield pipe 61 made of a superpconducting material to cut off external magnetic noises. Consequently, the cryostat 52 is reducible in size, so the scanning performance of magnetic inspection is excellent and a sensor part using the element 91 can be separated from a radioactivity source; and radiation resistance is improved and malfunction is reducible.

19. 发明专利

JPH01147360A METHOD AND DEVICE FOR DETECTING DETERIORATION 失效
公开(公告)号：JPH01147360A
公开(公告)日：1989-06-09
申请号：JP30565687
申请日：1987-12-04
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , ENOMOTO KUNIO , HASEGAWA KUNIO , HAYASHI MAKOTO , SHIMIZU TASUKU , TAKAKU KAZUO
IPC分类号： G01N27/72 , G01R33/12
摘要： PURPOSE:To accurately measure the deterioration of a body to be measured by measuring variation in the magnetic characteristics of the body and estimating the magnetic characteristics of an unused material. CONSTITUTION:An excitation system 2 and a magnetic sensor system 3 are arranged oppositely to the surface of the body 1 to be measured and a scan driving device 9 which drives them is connected to a scan driving controller 10. Excitation and magnetism detection data are inputted to a magnetic control unit 4 to set the best magnetization state. Those data are processed by deterioration parameters by a data processing unit 5, and a deterioration degree arithmetic unit 6 performs comparative arithmetic operation according to the previously found data base 7 of the material to decide the degree of deterioration of the body 1. At this time, the deterioration of the material can be evaluated with a normalized magnetic hysteresis loop area rate and normalized residual magnetic flux density which are normalized with the largest magnetic flux density.

20. 发明专利

JPH01119756A INSPECTING APPARATUS FOR DETERIORATION OF METAL MATERIAL 失效
公开(公告)号：JPH01119756A
公开(公告)日：1989-05-11
申请号：JP27744587
申请日：1987-11-04
申请人： HITACHI LTD
发明人： OTAKA MASAHIRO , ENOMOTO KUNIO , HASEGAWA KUNIO , HAYASHI MAKOTO , SHIMIZU TASUKU , TAKAKU KAZUO
IPC分类号： G01N27/72
摘要： PURPOSE:To enable the non-destructive and rapid detection of the degree of embrittlement of a metal material employed in a high temperature, by using a coil of a normal conductor for a pickup coil of a superconducting quantum interferometer. CONSTITUTION:An excitation coil 2 and a superconducting quantum interferometer 3 are disposed on the surface of a body 1 to be measured. The coil 2 is connected to a magnetization controller 4 to be subjected to the control on an excitation process. The interferometer 3 and the controller 4 are connected to a data processing device 5, and data on excitation and magnetizm detection are taken in the device 5. These data are collated with a master curve for judgement of the deterioration of materials which is determined beforehand, and the degree of deterioration of the body 1 to be measured is judged therefrom. On the occasion, the body 1 to be measured is magnetized by the coil 2, and a change in the magnetizm thereof is taken in rfSQUID 30 through a pickup coil 31. The change in the magnetizm detected by this rfSQUID 30 is sent to the device 5 by an rfSQUID controller 32.

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