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1. 发明专利

JPH11311694A REPLACEMENT METHOD FOR NUCLEAR REACTOR INSIDE STRUCTURE 失效
公开(公告)号：JPH11311694A
公开(公告)日：1999-11-09
申请号：JP11817098
申请日：1998-04-28
申请人： HITACHI LTD
发明人： YAMASHITA YOSHIHIRO , KATO TAKAHIKO , HATTORI SHIGEO , KOSHIISHI MASATO
IPC分类号： G21C19/02
摘要： PROBLEM TO BE SOLVED: To enable the replacement of a jet pump in a nuclear reactor having extended operation result with high reliability, by jointing the clad material of a reactor pressure vessel inside and the support structure of a new jet pump by friction welding. SOLUTION: The inside structure of a nuclear reactor 3, including a shroud 15 and a jet pump, is removed in a state where reactor water is held in a reactor pressure vessel 18, a shield body 38 is provided in a range including the reactor core area of the reactor pressure vessel 18, the reactor water of the reactor pressure vessel 18 is extracted, and thereafter in the case of the replacement of the reactor inside structure performing the attaching of the new inside structure and the removal of the shield body 38, the clad material of the inside of the reactor pressure vessel 18 and the support structure of the new jet pump are jointed with friction welding, when the new jet pump is attached. As a result, the clad material which lowered in mechanical strength through aging caused by extended operation and the support material of the jet pump can be jointed surely by a small heat input amount with the use of friction welding.

2. 发明专利

JPH10153679A INSPECTION METHOD AND DEVICE FOR PIPING AND THE LIKE 失效
公开(公告)号：JPH10153679A
公开(公告)日：1998-06-09
申请号：JP31333996
申请日：1996-11-25
申请人： HITACHI LTD
发明人： HIRANO AKIHIKO , HIRANO ATSUYA , OTAKA MASAHIRO , SUGANO SATOSHI , AMANO KAZUO , MIYAZAKI KATSUMASA , HATTORI SHIGEO , YAMAMOTO MICHIYOSHI
IPC分类号： G21C17/003 , G01N21/88 , G01N21/954
摘要： PROBLEM TO BE SOLVED: To provide a method and device accurately detecting shape and dimension of damage generating on the inner surface of piping and the like of reactor plant or thermal plant. SOLUTION: By providing piping 1 with penetration holes 7, casting laser light 50 from a penetration hole 1 to irradiate an inspection object part, scanning a specific area with the laser light 50, taking the brightness image of the reflection laser light 51 and analyzing the brightness image, the shape and dimension of damage generated on the piping 1 are known. From a location of piping 1 opened for inspection, a small size module having an incidence function of laser light 50, a detection function of laser light 50 and a scan function of laser light irradiation point is inserted into the inspection position inside the piping 1 and laser light reflection image of inspection object part is taken to detect the damage on the inner surface of the piping.

3. 发明专利

JPH09324900A METHOD AND APPARATUS FOR MONITORING THERMAL FATIGUE DAMAGE IN PIPING OR THE LIKE 失效
公开(公告)号：JPH09324900A
公开(公告)日：1997-12-16
申请号：JP14013796
申请日：1996-06-03
申请人： HITACHI LTD
发明人： HIRANO AKIHIKO , HAYASHI MAKOTO , HIRANO ATSUYA , HATTORI SHIGEO , YAMAMOTO MICHIYOSHI , TANI MICHINARI
IPC分类号： G21C17/003 , F16L55/00 , F17D5/06
摘要： PROBLEM TO BE SOLVED: To provide a method and an apparatus for monitoring in a high precision manner in an on-line mode during a plant operation a degree of thermal fatigue damage that a piping and a nozzle of a nuclear power plant or a fire plant may receive. SOLUTION: A part of a pipe 100 and/or a nozzle receiving a thermal fatigue is provided with a thin-walled part 201 by machining a circular hole from an outer circumference part, a thermal fatigue damage is concentrated at this thin-walled part 201, a size of the thermal fatigue damage concentrated in a preceding manner is detected by a potential method at a rear surface of the thin-walled part 201 or a through-pass of crack caused by the thermal fatigue at the thin-walled part is detected by a humidity detecting sensor 215 or a temperature measuring sensor 212, thereby a size of the thermal fatigue damage at the thick-walled part is evaluated, a suitable characteristic against the thermal fatigue of the piping 100 or the nozzle is monitored in a high precision manner in an on-line during operation of the plant. With such an arrangement as above, it is possible to detect the accumulation of the thermal fatigue damage before the piping and the nozzle are damaged by the thermal fatigue damage. Thus, it is possible to keep a high reliability in operation of the plant.

4. 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.

5. 发明专利

JPH0762893A STRUCTURE REPAIR METHOD 失效
公开(公告)号：JPH0762893A
公开(公告)日：1995-03-07
申请号：JP21548093
申请日：1993-08-31
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： SHIGENAKA NAOTO , FUSE MOTOMASA , TAMAI YASUKATA , NARUSE AKISUKE , FURUKAWA HIDEYASU , KUROSAWA KOICHI , HAYASHI EISAKU , HATTORI SHIGEO , SHINDOU TAKENORI
IPC分类号： B23K9/04 , B23K31/00 , B23P6/04 , E04G23/02 , G21C19/02
摘要： PURPOSE:To carry out repairs capable of ensuring sealing properties and soundness at a repair part for a long time by performing repair work which comprises cutting and padding from both surfaces or a single surface of a structural body and eliminating defects from the structural body. CONSTITUTION:In the case when it is unable to define preliminarily the length of a non-penetration defect of a structural member, a wall thickness 4 of the structural member 1 is cut in the same fashion with a penetration detect area 2. In this case, the wall thickness 4 of the structural body 1 may be preferably cut, but it is better to cut the structural body to some depth and stop the cutting work on the way in order to perform overlay welding at a later stage and build up welds on a cut portion. The structural body is cut to a depth which reaches the overlay welded area from the opposed surface and the cut area is overlay-welded. In the case when it is a non- penetration defect 3, if it is possible to grasp the length 5 of the non-penetration defect 3, it is acceptable to repair only the defective surface. In the case when a defect is penetrated but it is difficult to repair the detective area from both surfaces, the wall thickness 4 of the structural body 1 is cut from a single surface and then overlay welding is preferably performed in such a fashion that the penetration hole may be closed with the overlay welding.

6. 发明专利

JPH0483153A CORROSION DETECTING SYSTEM AND WATER QUALITY CONTROL SYSTEM 失效
公开(公告)号：JPH0483153A
公开(公告)日：1992-03-17
申请号：JP19851990
申请日：1990-07-26
申请人： HITACHI LTD
发明人： MABUCHI KATSUMI , SAKAI MASANORI , TAKAHASHI TAKUYA , YAMAUCHI HIROSHI , ONAKA NORIYUKI , HATTORI SHIGEO , OSUMI KATSUMI
IPC分类号： G01N17/02 , G01N27/26 , G21C17/02 , G21D3/08
摘要： PURPOSE:To highly sensitively detect and prevent the generation of a local corrosion by measuring respective potential differences between a plurality of collating electrodes inserted to a corrosion monitoring part or between them and the monitoring part. CONSTITUTION:A plurality of collating electrodes 1-1-3 are inserted to a pipeline from its flange part and set to, for example, a general pipeline part, a pipeline part receiving a stress, and a welded part 14 of the pipeline, respectively. Lead wires 13-1-3 taken from the nearest pipeline parts of these electrodes as their monitor parts and lead wires 13-4-6 connected to the respective electrodes are connected to a contact switching device 5. The wiring is conducted in such a manner that potential differences between the mutual electrodes and between the electrodes and the pipeline parts close thereto can be measured by ON-OFF of a switch. This measurement instruction is emitted from a computer conversion system, and the potential difference can be measured by a potentiometer through the wiring. When no corrosion is generated, the electric potentials are coincident to each other, and the generation of a corrosion and its position are detected by the measured potential difference.

7. 发明专利

JPH03100451A METHOD AND DEVICE FOR MONITORING ENVIRONMENTAL CRACK AND METHOD AND DEVICE FOR CONTROLLING CORROSIVE ENVIRONMENT 失效
公开(公告)号：JPH03100451A
公开(公告)日：1991-04-25
申请号：JP23734789
申请日：1989-09-14
申请人： HITACHI LTD
发明人： ANZAI HIDEYA , MABUCHI KATSUMI , SAKAI MASANORI , TAKAHASHI TAKUYA , URAYAMA YOSHINAO , KIKUCHI EIJI , KUNIYA JIRO , YAMAMOTO MICHIYOSHI , HATTORI SHIGEO , OSUMI KATSUMI
IPC分类号： G01N17/02 , G01N27/26 , G21C17/003
摘要： PURPOSE:To easily and accurately monitor the stress corrosion crack and environmental crack of a structure made of a metallic material exposed to corrosive environment by comparing the potential difference between the spacing part of the metallic structure and other part with a preset reference value. CONSTITUTION:The structure 1 of a potential measuring cell has a cylindrical external cell 3 and a cylindrical internal cell 7 disposed apart a prescribed annular spacing part 5 in the external cell 3 and is constituted of the same material as the material of the structure in a light water reactor. Respective electrodes 27, 29 for potential measurement are provided in and out of the spacing part 5 in the corrosive environment. A detector 35 measures the difference in the potential in the two electrodes 27, 29. A comparing means 37 makes comparison between the potential difference and the preset reference value (critical potential difference) concerning the generation and progression of the crack in the corrosive environment. A warning command signal to a warning device 39 is outputted when the potential difference is larger than the reference value. The stress corrosion crack and environmental crack of the structure made of the metallic material exposed to the corrosive environment are easily and accurately monitored in this way.

8. 发明专利

JPS61233948A ANALYZER FOR GRAIN BOUNDARY RUPTURE IN VACUUM 失效
公开(公告)号：JPS61233948A
公开(公告)日：1986-10-18
申请号：JP7423885
申请日：1985-04-10
申请人： HITACHI LTD
发明人： JINNO YUKISHIGE , KATAHIRA MICHINORI , OKAJIMA YOSHIAKI , HATTORI SHIGEO , HOSOI NORIFUNE
IPC分类号： H01J37/20 , H01J37/252
摘要： PURPOSE:To accurately compare the characteristics of the surfaces of various test pieces with each other, by housing the plural test pieces in a chamber at one time, and rupturing and analyzing the test pieces in the same environment. CONSTITUTION:A housing chamber 1, into which a plurality of test pieces 4 are put from an atmospheric side, is removed of air by a vacuum pump 5. A rupturing chamber 2, in which a rupturing rod 9 for rupturing the test pieces is housed, is removed of air by a vacuum pump 6. An analyzing chamber 3, in which an analyzer 10 and a conveyor 19 employing a permanent magnet are housed, is removed of air by a vacuum pump 7. The test pieces 4 are conveyed between the housing chamber 1 and the rupturing chamber 2 by a conveyor 2 employing a pinion-rack mechanism. The plural test pieces can thus be put in the housing chamber at one time and ruptured and analyzed in the same environment to enhance the efficiency of work and accurately compare the physical properties of the surfaces of the various test pieces with each other.

9. 发明专利

JPH10170691A SURFACE REFORMING METHOD OF METALLIC MEMBER 失效
公开(公告)号：JPH10170691A
公开(公告)日：1998-06-26
申请号：JP32820496
申请日：1996-12-09
申请人： HITACHI LTD
发明人： AMANO KAZUO , ENOMOTO KUNIO , HIRANO AKIHIKO , HIRANO ATSUYA , HATTORI SHIGEO , HAYASHI EISAKU , UEYAMA TOSHIHARU , HAYASHI MAKOTO
IPC分类号： G21D1/00 , C23F15/00
摘要： PROBLEM TO BE SOLVED: To prevent service life reduction such as corrosion fatigue of a carbon steel and low alloy steel apparatus or the like by improving corrosion resistance of the outermost surface by chemically or electrochemically removing an impurity, and improving strength of a surface layer by plastic working of the surface layer. SOLUTION: Photographic paper 4 soaked in a dilute sulfuric acid slution is stuck to a part whose metallic surface is polished, and S existing as an independent inclusion 1 becomes slufuric acid gas by reacting with a sulfuric acid, and is reacted with Ag of the photographic paper 4, and when the photographic paper 4 is discolored in brown, it is torn off, and new photographic paper 4 is again brought into close contact with the part, and it is repeated. When discoloration is eliminated, an inspecting sulfur print is lastly performed, and a discoloring degree of the photographic paper 4 is inspected, and a white color is confirmed, and when a surface is washed thereafter, an elution mark of S and MnS of a member surface remains as a recess, residual stress of the recess is higher than before elution of the inclusion. Then, when surface plastic working is performed, a metallic member is push-drawn as a surface layer by decay pressure of a water jet peen peening method or the like, and plastic deformation is imparted, and the surface layer is strengthened and reformed, and corrosion resistance can be improved.

10. 发明专利

JPH08104949A FORMATION OF STRUCTURE HAVING SURFACE TREATED LAYER AND SURFACE TREATED LAYER 失效
公开(公告)号：JPH08104949A
公开(公告)日：1996-04-23
申请号：JP24100694
申请日：1994-10-05
申请人： HITACHI LTD
发明人： URASHIRO KEIICHI , SATSUTA HISATAKA , KONUMA AKIRA , NAKAMURA MITSUO , KONUMA TSUTOMU , MATSUMOTO TOSHIMI , KATO TAKAHIKO , HATTORI SHIGEO , HAYASHI EISAKU , MORINAKA TADASHI , TAMAI YASUKATA
IPC分类号： G21C19/02 , B23K9/04 , B23K26/00 , B23K26/064 , B23K26/34 , B23K26/352 , B23K31/00 , C21D1/09 , C21D6/00 , C21D9/50 , C22C38/00 , C22C38/44 , C22C38/58
摘要： PURPOSE: To provide a means of forming a structure low in high temp. crack sensitivity at the time of surface treatment and having a surface layer good in corrosion resistance after the execution of the heat treatment and forming the surface treated layer. CONSTITUTION: A structure constituted of an austenitic stainless steel whose surface part is formed of an upper part layer 6 having an austenite single phase structure and a lower part layer 5 having a structure solidified by primary crystal ferrite and the same surface layer are formed. Thus, the structure having the surface layer free from the generation of deterioration in corrosion resistance caused by low temp. sensitization or the like can be produced, and the generation of defects caused by solidifying cracks and high temp. cracks can be prevented at the time of forming the surface lager.

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