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1. 发明专利

JPH11325290A VALVE DEVICE 失效
公开(公告)号：JPH11325290A
公开(公告)日：1999-11-26
申请号：JP2122099
申请日：1999-01-29
申请人： HITACHI LTD , HITACHI KYOWA ENG CO LTD
发明人： TAKESHIMA KIKUO , IWATA YASUTAKA , CHIBA YOSHITERU , ONAKA NORIYUKI , SHINOHARA HIROYUKI
IPC分类号： F16K25/00 , F16K3/12
摘要： PROBLEM TO BE SOLVED: To improve abrasion resistance and airtightness of a valve device without containing cobalt by performing CrN ceramic coating on a base material of a valve element for, a sliding portion of the valve element from among sliding portions in contact with the valve element in the valve device. SOLUTION: Ceramic coating is applied on a sliding portion of a valve box in contact with a valve body 2 directly in a thick manner. The ceramic coating treatment is carried out repetitively by plasma arc method to thicken the film thickness and improve abrasion resistance of the ceramic film. The valve element 2 is vertically reciprocated by the operation of a rotary handle 8 through a valve rod 7, for opening and closing a flow passage (p) of jount portions 4. The valve element 2 has substantially circular side surfaces 2a, 2b faced to the flow passage (p). Ceramic coating 2c is applied to the peripheries of the side surfaces 2a, 2b, that is, whole of the seal portion. The sliding portion of the valve box is made of the same material as the box.

2. 发明专利

JP2000273573A CORROSION RESISTANT AND WEAR RESISTANT ALLOY AND APPARATUS USING THE ALLOY 失效
公开(公告)号：JP2000273573A
公开(公告)日：2000-10-03
申请号：JP8307799
申请日：1999-03-26
申请人： HITACHI LTD , HITACHI KYOWA ENG CO LTD
发明人： KIYOTOKI YOSHIHISA , CHIBA YOSHITERU , KUMAGAI MAKOTO , OGAWA SUKEHIRO , SAKAMOTO AKIRA , ONAKA NORIYUKI , SHINOHARA HIROYUKI
IPC分类号： G21D1/00 , C22C32/00 , C22C38/00 , F16K25/04
摘要： PROBLEM TO BE SOLVED: To suppress the corrosion of eutectic carbides of a Co base alloy (so with Ni base and Fe base alloys) used for the sliding part of an apparatus and a valve seat which have been the cause of increasing the amt. of radiation in a nuclear power plant. SOLUTION: A Co base alloy (so with Ni base and Fe base alloys) used for the sliding part of an apparatus and the valve seat of a valve is subjected to plastic working, by which, in eutectic carbides and the base material part of a cast structure composing the Co base alloy (so with Ni base and Fe base alloys), the eutectic carbides are spheroidized and granulated, so that the corrosion of the eutectic carbides can be limited to the surface, and the corrosion is stopped to the limited range of the surface. Therefore, the corrosion is suppressed, the suppression of the frequency of the disassembly and inspection is made possible, furthermore, in the Co base alloy, by the suppression of the amt. to be corroded, the amt. of Co to be eluted reduces, and the amt. of Co brought into a reactor vessel can also be suppressed.

3. 发明专利

JPH1036929A ZIRCONIUM-BASE ALLOY PLATE REDUCED IN IRRADIATION GROWTH, ITS PRODUCTION, AND ITS USE 失效
公开(公告)号：JPH1036929A
公开(公告)日：1998-02-10
申请号：JP10128297
申请日：1997-04-18
申请人： HITACHI LTD
发明人： INAGAKI MASATOSHI , SUGANO MASAYOSHI , TAKASE IWAO , KIDA TOSHITAKA , ONAKA NORIYUKI , ISHIZAKI HIDEAKI , HIRAKAWA HIROMASA , MAKI HIDEO
IPC分类号： G21C3/06 , C22C16/00 , C22F1/00 , C22F1/18 , G21C3/07 , G21C3/30 , G21C3/324
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of elongation and warpage deformation, caused by irradiation growth, by specifying the rate of orientation of a specific crystal orientation of hexagonal Zr of allot in a direction perpendicular to the plate surface. SOLUTION: Warpage deformation is caused by the orientation of the crystal orientation of hexagonal Zr metal in a direction perpendicular to the surface of Zr alloy. On neutron irradiation, the crystal is contracted in the direction and expands in a direction perpendicular to the direction. As a result, in the case of a fuel channel box in which the crystal orientation is oriented perpendicularly to the surface, irradiation growth occurs in a longitudinal direction and a width direction, If the amount of irradiation differs in different positions, difference in the amount of irradiation growth is bright about and causes warpage deformation. In this case, by regulating the rate of orientation, Fr as of the crystal orientation on a direction perpendicular to the plate surface is regulated to 0.20-0.50, irradiation elongation is remarkably decreased and, even in a high irradiation region of 10 (n/cm ) amount of neutron irradiation, elongation is reduced essentially to zero, that is, the occurrence of warpage deformation can be prevented.

4. 发明专利

JPH1019825A POTENTIAL MEASURING DEVICE AND ELECTRICITY GENERATING PLANT PIPING SYSTEM 失效
公开(公告)号：JPH1019825A
公开(公告)日：1998-01-23
申请号：JP17514896
申请日：1996-07-04
申请人： HITACHI LTD
发明人： YAMAUCHI HIROSHI , ONAKA NORIYUKI , SAKAI MASANORI , TAKAHASHI TAKUYA , AKAMINE KAZUHIKO , SHIMIZU NOBUO
IPC分类号： G01N27/26 , G21C17/003
摘要： PROBLEM TO BE SOLVED: To grasp accurately the speed of a running fluid on a metal face and measure an accurate corrosive potential. SOLUTION: As a cylindrical reference electrode 2 is disposed in a pipe of a cylindrical test electrode 1 so as to correspond to its axis, a clearance between an outer periphery of the reference electrode 2 and an inner periphery of the test electrode 1 is identical even in any position axially. Therefore, the speed of a running fluid is accurately made uniform in a portion where the reference electrode 2 is disposed in the test electrode 1, and the speed of a running fluid can be stabilized and uniformized and the speed of a running fluid can be grasped, and as a result, as potential measurement can be carried out in a state that the speed of a running fluid is grasped, the potential measurement can accurately be carried out to that extent.

5. 发明专利

JPH08313688A BOILING WATER REACTOR POWER PLANT AND ITS OPERATION METHOD 失效
公开(公告)号：JPH08313688A
公开(公告)日：1996-11-29
申请号：JP12470395
申请日：1995-05-24
申请人： HITACHI LTD
发明人： HIRA YASUO , ONAKA NORIYUKI
IPC分类号： G21C17/02 , G21C19/307 , G21D1/00 , G21D3/08
摘要： PURPOSE: To suppress concentration of radioactives such as cobalt 60 and cobalt 58 in reactor water which are most effective to exposure dose of workers by injecting Ni and Cr in supply water or rector water. CONSTITUTION: To control the concentration ratio of Fe, Ni, Cr and Co in reactor water, Ni and Cr is injected in supply water or reactor water so as to reduce surface dose rate in pipings of boiling water reactor power plant. The Ni and Cr to be injected is desirably metal ion or cladding. In this control system, optimum ion concentration value is set in a setting part 19 and various metal ion concentrations in supply water or reactor water are detected individually at a detection part 20. Then, by comparing in a comparator the ion concentration value in the setting part 19 and that in the detection part 20, the injection rate of Ni and Cr is controlled in a controller 20 so that the detected ion concentration value does not deviate from the set value. By expressing the effect of each water quality factor on each radioactive element with such equation as feedback, an optimum control of water quality is performed.

6. 发明专利

JPH07238334A SLIDING PARTS AND SLIDING MEMBER FOR NUCLEAR POWER PLANT 失效
公开(公告)号：JPH07238334A
公开(公告)日：1995-09-12
申请号：JP5101794
申请日：1994-02-25
申请人： HITACHI LTD
发明人： MIYAZAKI KUNIO , INAGAKI MASATOSHI , ONAKA NORIYUKI , SUWA MASATERU , KUNIYA JIRO , SHIRAKI TOMOMI , KOSHIISHI MASATO
IPC分类号： C22C19/03
摘要： PURPOSE:To obtain a sliding member capable of reducing exposure dose and increasing the safty of nuclear power plant by using an iron-base alloy, dispersedly containing specific amounts of vanadium carbide in a matrix, as a fixed member and also using a nickel-base alloy of specific composition as a movable member. CONSTITUTION:Sliding parts for nuclear power plant can be produced by using an iron-base alloy (stainless steel, etc.), dispersedly containing fine grains of vanadium carbide in a matrix by 1-10% by volume ratio, as a fixed member and also using a nickel-base alloy, consisting of, by weight ratio, 13-22% chromium, 3-10% molybdenum, 3-8% aluminum, 0.5-5% titanium, 1-5% zirconium,

7. 发明专利

JPH06201885A OPERATING CONDITION MONITORING SYSTEM OF PLANT 失效
公开(公告)号：JPH06201885A
公开(公告)日：1994-07-22
申请号：JP16087193
申请日：1993-06-30
申请人： HITACHI LTD
发明人： SAKAI MASANORI , MABUCHI KATSUMI , ARATO TOSHIAKI , TAKAHASHI TAKUYA , IZUMITANI MASAKIYO , MASAOKA ISAO , KOJIMA YOSHIYUKI , INAGAKI MASATOSHI , OSUMI KATSUMI , HAYASHI MAKOTO , SATO FUMIO , SUWA MASATERU , AKAHORI KIMIHIKO , BABA KENJI , YAMAUCHI HIROSHI , ONAKA NORIYUKI
IPC分类号： G01N17/02 , G01N27/26 , G01N27/27 , G01N27/30 , G01N27/403 , G21C17/02 , G21D3/08
摘要： PURPOSE:To precisely extract water quality information of high temperature water indispensable to operation condition monitoring of a nuclear power plant, a thermal power plant and the like by using a specific electrochemical reference electrode (ECP sensor) as a water quality sensor. CONSTITUTION:There is an EPC sensor, viz. a silver/silver halide reference electrode, on which alumina or zirconia 25 and silver halide 23 adhere to both the faces of a silver wire 26 and alumina coating 22, 24 is formed with a cataphoresis method thereon. A sensor part made as above-mentioned is lapped and protected with a guard 21 in which a slender hole is provided in the lower part thereof, an end of the silver wire 26 is electrically connected to a lead wire 31 and an upper part thereof is sealed with a glass 27. In addition, a space between the guard 21 and the lead wire 31 is filled with magnesia and an end part thereof is sealed with another glass 30. The sensor is fixed on a fixed member 29 of an instrumentation pipe of a nuclear reactor and the like and, because high temperature water of a plant is not directly brought into contact with a solid electrolyte (silver halide), its life is very long and reliability of data can be heightened.

8. 发明专利

JPH05312763A 失效
公开(公告)号：JPH05312763A
公开(公告)日：1993-11-22
申请号：JP12169792
申请日：1992-05-14
申请人： HITACHI LTD
发明人： MABUCHI KATSUMI , SAKAI MASANORI , TAKAHASHI TAKUYA , YAMAUCHI HIROSHI , ONAKA NORIYUKI
IPC分类号： G01N27/401 , G01N27/30
摘要： PURPOSE:To improve a long service life and high stability of a sensor which gives the reference potential of a monitoring system in hot water or radiation area by fitting a plate with an optional surface roughness in a liquid junction part of the sensor. CONSTITUTION:A sapphire plate 3 is placed on a sensor body 4 made of sapphire. The contact faces form a liquid junction part from sensor internal liquid thru test solution. The surface roughness of both sapphires determine the diameter of clearance where the liquid flows in the liquid junction part, and when the clearance becomes smaller, an outward flowing of the sensor internal liquid will be suppressed, thereby prolonging a service life of the sensor. However, it must have a sufficient dimension so that the ion may flow. In addition, a tip sleeve 1 is attached on a sensor body 4 at the sensor tip section. The junction of the sleeve 1 and the body 4 adopts metalizing and silver soldering methods according to a Ti metal method.

9. 发明专利

JPH05209856A METHOD FOR DETECTING SENSITIVITY OF STRUCTURE MATERIAL AND NUCLEAR POWER PLANT WATER QUALITY CONTROL SYSTEM 失效
公开(公告)号：JPH05209856A
公开(公告)日：1993-08-20
申请号：JP19505592
申请日：1992-07-22
申请人： HITACHI LTD
发明人： SAKAI MASANORI , ONAKA NORIYUKI , IZUMITANI MASAKIYO , HATTORI SHIGEO
IPC分类号： G01N17/00 , G01N27/26 , G21C17/02 , G21D3/08
摘要： PURPOSE:To obtain a method for detecting sensitivity of a plant structure material for detecting its grain boundary corrosion cracking sensitivity in a short time. CONSTITUTION:A method for detecting sensitivity comprises a sensitivity detecting electrochemical cell placed movably in a PWR plant ICM housing 1 or an instrumentation tube 114. By providing an electrochemical measuring system 2 for performing electrochemical potential measurement such as pulse voltametry and a remote operation system 3 for performing remote control of the electrochemical cell, pulse electrochemical measurement is performed while a target to be monitored is being monitored, thereby electrochemically detecting sensitivity inside a plant structure capillary tube or the like in a very short time. Therefore health of the structure material of a nuclear plant, a thermal power plant and a chemical plant can be maintained and preventive maintenance is possible.

10. 发明专利

JPH04236331A LIQUID LEVEL METER 失效
公开(公告)号：JPH04236331A
公开(公告)日：1992-08-25
申请号：JP423991
申请日：1991-01-18
申请人： HITACHI LTD
发明人： TAKASE IWAO , INAGAKI MASATOSHI , KANNO MASAYOSHI , IZAKI NAOYUKI , ONAKA NORIYUKI
IPC分类号： G01F1/52 , G01F23/24
摘要： PURPOSE:To provide a liquid level meter which directly measures the liquid level in severe circumstances of high-temperature and high-pressure water and steam while a plurality of electrode rods are inserted into a pressure container. CONSTITUTION:As an electrode a fine wire of zirconium alloy is used. The surface of a conductive part thereof is coated with an oxide film for electrically insulation. Platium, gold or silver which is non-oxidizing is pressure-welded to the surface of an end part of an electrode rod where the electricity concentrates. In the liquid level meter thus obtained, a measuring electrode, a reference electrode and a comparison electrode which are formed into one body serving both as an electric conductor and as an electric insulator are arranged in a pressure container. Sine waves of 1kHz or so are applied to the meter in a manner not to influence a product and a test body. The change of the electric resistance when the measuring electrode comes in touch with the liquid is detected as the change of the liquid level.

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