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1. 发明专利

JP2001141722A METHOD OF ESTIMATING CORROSION OF PLANT STRUCTURAL MATERIAL AND CORROSION DIAGNOSTIC SYSTEM 失效
公开(公告)号：JP2001141722A
公开(公告)日：2001-05-25
申请号：JP2000289974
申请日：2000-09-25
申请人： HITACHI LTD
发明人： HONDA TAKU , HIRA YASUO , ARAI YUKO , YOKOSUKA TSUNENOBU , SUKEGAWA MASAYUKI
IPC分类号： G01N17/00 , G01N33/20 , G21C19/46
摘要： PROBLEM TO BE SOLVED: To estimate the corrosion of a structural material in contact with an acidic solution in a plant for processing the acidic solution, particularly, in a spent nuclear fuel reprocessing facility. SOLUTION: The product of corrosion speed in atmospheric boiling state, corrosion acceleration of dissolved chemical species, welding influence correction value, temperature correction value, and operation mode correction value is estimated as the corrosion speed in a plant to be diagnosed. This diagnostic system comprises estimating the corrosion speed and corrosion state by use of material information 1, operation information 3 and medium information 5, and outputting the result of estimation.

2. 发明专利

JPH09170704A WATER QUALITY MONITORING FOR VAPOUR CONDENSED WATER AND ENERGY CONVERTING SYSTEM USING THE SAME 失效
公开(公告)号：JPH09170704A
公开(公告)日：1997-06-30
申请号：JP33301295
申请日：1995-12-21
申请人： HITACHI LTD
发明人： YAMAUCHI HIROSHI , HIROTA MAMORU , KAWAKAMI TOSHIO , HONDA TAKU
IPC分类号： F01D25/32 , F01K9/00 , F22B37/38
摘要： PROBLEM TO BE SOLVED: To enable an entire system having steam and a metal contacted to each other to be prevented from being corroded by a method wherein a part of water steam is extracted, the extracted water steam is condensed under a condensing condition similar to that near a surface of a turbine vane, the condensed water is stored in a condensed water chamber and quality of the condensed water in the condensed water chamber is measured. SOLUTION: A part of steam fed to a condensed water quality monitor 39 is extracted from a front stage of a drying or humidifying alternating region within a low pressure turbine 4, the extracted steam is fed to a steam chamber 18 acting as a condensing chamber through a low pressure turbine steam extracting pipe 40, and condensed under the same condensing condition as one near the surface of the turbine vane. Then, the condensed water generated at the steam chamber 18 is accumulated at a condensed water chamber 19 and water quality of the condensed water in the condensed water chamber 19 is measured by various kinds of water quality sensors assembled in the condensed water chamber 19. With such an arrangement as above, it becomes possible to measure the environment of condensed water at the surface of the turbine material in the drying and humidifying region and in addition, it is possible to prevent corrosion damage of the steam turbine material.

3. 发明专利

JPH0931601A CAST AUSTENITIC STAINLESS STEEL WITH SEAWATER CORROSION RESISTANCE AND SEAWATER PUMP 失效
公开(公告)号：JPH0931601A
公开(公告)日：1997-02-04
申请号：JP18882295
申请日：1995-07-25
申请人： HITACHI LTD
发明人： KATO TOMOYA , YOKOSUKA TSUNENOBU , HONDA TAKU , KIMURA JINJI
IPC分类号： C22C38/00 , C22C38/40
摘要： PROBLEM TO BE SOLVED: To improve the pitting corrosion resistance of a cast austenitic stainless steel at the time of use for seawater pump by specifying the composition of the cast austenitic stainless steel. SOLUTION: This steel has a composition containing, by weight ratio, =6vol.%. It is preferable that the ratio between the Cr equivalent represented by %Cr+%Mo+1.5×%C+0.5×%Mn and the Ni equivalent represented by %Ni+30×%C+0.5×%Mn, (Cr equivalent)/(Ni equivalent), is regulated to >=1.95% and also the degree of cleanliness of the steel is regulated to .

4. 发明专利

JPH01320457A METHOD AND SYSTEM FOR WARNING MATERIAL DAMAGE 失效
公开(公告)号：JPH01320457A
公开(公告)日：1989-12-26
申请号：JP15232288
申请日：1988-06-22
申请人： HITACHI LTD
发明人： HONDA TAKU
IPC分类号： G01N27/00
摘要： PURPOSE:To improve the reliability of an apparatus by previously setting two corrosion rates and issuing an alarm when a measured value is over the lower set value and corrosion quantity is over a prescribed value besides and when the measured value is over the higher set value. CONSTITUTION:Electrodes (a) provided in a plant is connected to a corrosion rate measuring unit (c) through a channel selector (b) by a GP-IB. Besides, it is connected to a computer (d) by the GP-IB and also joined to a corrosion damage alarm issuing device (e). Then, a threshold value (v1) {a value having possibility that material is damaged when a value (v) is long over the threshold value (v1)} and a threshold value (v2) {a value having the high possibility of the damage and having necessity to immediately issue the alarm and the relation of the values is (v2)>(V1)} are previously set for the corrosion rate (v). In the case that the relation of the values is (v2)>(v)>=(v1), arithmetic operation that the corrosion quantity (m) is calculated based on the temporal change of the rate (v) is started and the alarm is issued when the value (m) is over the prescribed value (m0). When the value (v) is below the value (v1) and this state continues for a fixed time in course of the arithmetic operation, the state is returned to an initial state. In the case that the relation of the values is (v)>=(v2), the alarm is immediately issued when this state continues for the fixed time.

5. 发明专利

JPH01287286A METHOD AND DEVICE FOR PREVENTING CORROSION IN HIGHLY CORROSIVE LIQUID 失效
公开(公告)号：JPH01287286A
公开(公告)日：1989-11-17
申请号：JP11414788
申请日：1988-05-11
申请人： HITACHI LTD
发明人： SASAKI YUKO , HONDA TAKU , SHOJI SABURO , FURUYA YASUMASA , YANOKURA YUKIO
IPC分类号： G21C19/46 , C23F13/00 , G21F9/22
摘要： PURPOSE:To prevent the corrosion of an apparatus made of an austenitic stainless steel in a nitric acid soln. contg. oxidizable metal ions without increasing radioactive waste by using a baser stainless steel than the austenitic stainless steel as a galvanic anode for electrolytic protection. CONSTITUTION:When an apparatus handling a nitric acid soln. contg. oxidizable metal ions in a plant for reprocessing nuclear fuel, etc., is made of an austenitic stainless steel, a baser metal than the stainless steel is connected as a galvanic anode to the stainless steel and electric current for electrolytic protection is supplied. A stainless steel having >=2wt.% Si content or, a martensitic or ferritic stainless steel having 12-14% Cr content is used as the baser metal.

6. 发明专利

JPS62278497A METHOD OF REDUCING RADIOACTIVITY OF NUCLEAR POWER PLANT 失效
公开(公告)号：JPS62278497A
公开(公告)日：1987-12-03
申请号：JP12110286
申请日：1986-05-28
申请人： HITACHI LTD
发明人： OHASHI TAKEYA , HONDA TAKU , KASHIMURA EIJI , FURUYA YASUMASA , OSUMI KATSUMI
IPC分类号： G21D1/00

7. 发明专利

JPS6230269B2 失效
公开(公告)号：JPS6230269B2
公开(公告)日：1987-07-01
申请号：JP7120179
申请日：1979-06-08
申请人： HITACHI LTD
发明人： HONDA TAKU , MINATO AKIRA , IZUMITANI MASAKYO , KASHIMURA EIJI , OOSUMI KATSUMI
IPC分类号： G21D1/00 , C23F13/00 , C23F14/00 , C23F15/00 , F28F19/00

8. 发明专利

JPS6295498A CONSTITUTIONAL MEMBER OF NUCLEAR POWER PLANT 失效
公开(公告)号：JPS6295498A
公开(公告)日：1987-05-01
申请号：JP23524385
申请日：1985-10-23
申请人： HITACHI LTD
发明人： HONDA TAKU , KASHIMURA EIJI , FURUYA YASUMASA , OHASHI TAKEYA , MINATO AKIRA , OSUMI KATSUMI
IPC分类号： G21D1/00

9. 发明专利

JPS6224195A METHOD OF REDUCING RADIOACTIVITY OF NUCLEAR POWER PLANT 失效
公开(公告)号：JPS6224195A
公开(公告)日：1987-02-02
申请号：JP16212585
申请日：1985-07-24
申请人： HITACHI LTD
发明人： OHASHI TAKEYA , HONDA TAKU , FURUYA YASUMASA , KASHIMURA EIJI , MINATO AKIRA , OSUMI KATSUMI , AIZAWA MOTOHIRO
IPC分类号： G21F9/00 , G21D1/00 , G21D3/08

10. 发明专利

JPS61290397A LOW RADIOACTIVE NUCLEAR POWER PLANT 失效
公开(公告)号：JPS61290397A
公开(公告)日：1986-12-20
申请号：JP13191385
申请日：1985-06-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： HONDA TAKU , KASHIMURA EIJI , FURUYA YASUMASA , OHASHI TAKEYA , MINATO AKIRA , AIZAWA MOTOHIRO , OSUMI KATSUMI
IPC分类号： G21D1/00 , G21D3/00

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