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1. 发明专利

JP2000227499A CHEMICAL DECONTAMINATION 失效
公开(公告)号：JP2000227499A
公开(公告)日：2000-08-15
申请号：JP2811899
申请日：1999-02-05
申请人： HITACHI LTD , KURITA ENG CO LTD , KURITA WATER IND LTD , HITACHI ENG CO LTD
发明人： NAKAMURA FUMITO , NAGASE MAKOTO , AIZAWA MOTOHIRO , YOSHIKAWA HIROO , FURUKAWA SEIJI
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To lower leakage of hydrogen peroxide to the downstream side of a decomposing device by controlling an injection quantity of hydrogen peroxide in compliance with impurity concentration and pH in a decontaminating agent when decomposing a reducing decontaminating agent mainly consisting of dicarboxylic acid. SOLUTION: For example, chemical decontamination of a nuclear reactor 1 and a nuclear reactor recirculation line 2 is carried out by using a temporarily installed apparatus provided with a reducing agent decomposing device 18 such as a catalytic decomposing device and a ultraviolet irradiator. First of all, an oxidizing agent such as a potassium permanganate solution is used for carrying out oxidizing decontamination, and then, the oxidizing agent is decomposed. Subsequently, reducing decontamination is carried out according to a predetermined way using a reducing agent prepared by adjusting pH of oxalic acid solution with hydrazine. After the reducing decontamination process is finished, the decontaminating agent is introduced to the reducing agent decomposing device 18. In this process, hydrogen peroxide is injected onto the upstream side of the reducing agent decomposing device 18 from a hydrogen peroxide tank 32. An injection quantity is regulated in compliance with impurity concentration representing iron concentration or the like measured in a sampling point 36 and pH measured by a pH meter 37.

2. 发明专利

JP2001083294A METHOD FOR CHEMICAL DECONTAMINATION 失效
公开(公告)号：JP2001083294A
公开(公告)日：2001-03-30
申请号：JP25753299
申请日：1999-09-10
申请人： HITACHI LTD , KURITA ENG CO LTD , KURITA WATER IND LTD
发明人： NAKAMURA FUMITO , AIZAWA MOTOHIRO , NAGASE MAKOTO , FURUKAWA SEIJI , YOSHIKAWA HIROO
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To stably achieve goals DF and the quality of water when the chemical decontamination finishes. SOLUTION: In a method for chemical decontamination where radioactive nuclides are chemically removed from the surface of a metal member that is contaminated with the radioactive nuclides, this method for chemical decontamination is processed by a reductive decontamination process where a reductive decontamination agent composed mainly of an organic acid is used as a decontamination liquid, and by inhibiting radioactive metal ions from leaking from a resin tower during the decomposition of the reductive decontamination agent that is carried out after the completion of the reductive decontamination process. The leak of the radioactive metal ions from the resin tower can be inhibited by appropriately controlling the quantity and time of the water supplied to the resin tower on the basis of the concentration of a reductive decontamination agent, the potential of hydrogen (pH) and the concentration of metal ions in a decontamination liquid in the reductive decontamination process, and a process for decomposing the reductive decontamination agent. This makes it possible to stably achieve goals DF and the standard of water quality when chemical decontamination finishes.

3. 发明专利

JP2003194995A DRY THERMAL DECOMPOSITION METHOD AND APPARATUS FOR ORGANIC ACID DECONTAMINATION WASTE LIQUID 有权
公开(公告)号：JP2003194995A
公开(公告)日：2003-07-09
申请号：JP2002271443
申请日：2002-09-18
申请人： HITACHI LTD , HITACHI ENG CO LTD , KURITA ENG CO LTD
发明人： AIZAWA MOTOHIRO , KATAOKA ICHIRO , NAGASE MAKOTO , OUCHI SATOSHI , ANAZAWA KAZUMI , YOSHIKAWA HIROO , KAZAMA MASAHIKO
IPC分类号： G21F9/08 , B01D1/22 , B01D1/24 , C02F1/72 , G21F9/28
摘要： PROBLEM TO BE SOLVED: To provide a dry thermal decomposition method and apparatus for organic acid decontamination waste liquid capable of reducing the quantity of waste by effecting a complete thermal decomposition of the organic acid decontamination waste liquid in a temperature range from 100°C up to at most 170-180°C without using an ion exchange resin. SOLUTION: The dry thermal decomposition apparatus for organic acid decontamination waste liquid disposes of a decontamination waste liquid remaining after decontamination of a radioactive substance by use of a chemical solution containing an organic acid, and comprises a spray means 7 for spraying the decontamination waste liquid onto a heating medium, a heating medium 8 for evaporating water by heating the decontamination waste liquid sprayed to 100°C or higher, a heating means 9 for supplying a quantity of heat required for drying the water in the waste liquid and recovery means 12 and 13 for removing dry powder produced on the heating medium 8. The decontamination waste liquid containing the organic acid is sprayed onto the heating medium 8 at not lower than 100°C in an environment of air or containing oxygen so as to decompose the organic acid contained in the decontamination waste liquid into carbon dioxide gas and water. Thus, the apparatus completely extinguishes the organic acid. COPYRIGHT: (C)2003,JPO

4. 发明公开

EP3065139A4 METHOD AND APPARATUS FOR TREATING LIQUID CONTAINING IRON-GROUP METAL IONS, METHOD AND APPARATUS FOR ELECTRODEPOSITION OF CO AND FE, AND METHOD AND APPARATUS FOR DECONTAMINATION OF RADIOACTIVE WASTE ION EXCHANGE RESIN 有权
标题翻译： VERFAHREN UND VORRICHTUNG ZUR BEHANDLUNG EINERFLÜSSIGKEITMIT EISENGRUPPEN-METALLIONEN，VERFAHREN UND VORRICHTUNG ZUR ELEKTROLYTISCHEN ABSCHEIDUNG VON KUPFER UND EISEN SOWIE VERFAHREN UND VORRICHTUNG ZUR DEKANNAMINATION EINES IONENAUSTAUSCHERHARZES AUS RADIOAKTIVENABFÄLLEN
公开(公告)号：EP3065139A4
公开(公告)日：2017-06-28
申请号：EP14854988
申请日：2014-10-20
申请人： KURITA WATER IND LTD , HITACHI-GE NUCLEAR ENERGY LTD
发明人： MIYAMOTO SHINGO , IWASAKI MAMORU , HIROSE MAMI , AIZAWA MOTOHIRO , OTA NOBUYUKI , SUMIYA TAKAKO , ISHIDA KAZUSHIGE
IPC分类号： G21F9/06 , C25C1/06 , C25C1/08 , G21F9/00 , G21F9/12 , G21F9/30
CPC分类号： G21F9/12 , C25C1/06 , G21F9/00 , G21F9/001 , G21F9/06 , G21F9/30 , G21Y2002/60 , G21Y2004/601

5. 发明专利

JP2002116295A DECONTAMINATION METHOD AND DECONTAMINATION DEVICE 失效
公开(公告)号：JP2002116295A
公开(公告)日：2002-04-19
申请号：JP2000311682
申请日：2000-10-05
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NAGASE MAKOTO , UETAKE NAOTO , ANAZAWA KAZUMI , AIZAWA MOTOHIRO , SAKASHITA MOTOAKI
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To provide a decontamination method and decontamination device, capable of shortening time necessary for decontaminating a decontamination object. SOLUTION: Water jet generating cavitation in water is discharged to a decontamination object underwater and water utilized for the water jet is used for chemical decontamination.

6. 发明专利

JP2001235594A CHEMICAL DECONTAMINATION METHOD IN REACTOR PRESSURE VESSEL 失效
公开(公告)号：JP2001235594A
公开(公告)日：2001-08-31
申请号：JP2000047753
申请日：2000-02-24
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO , KATAOKA ICHIRO , ANAZAWA KAZUMI
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To improve decontamination effect by adjusting decontamination liquid level in a reactor pressure vessel. SOLUTION: A bag vessel 18 including water is inserted in a space of a storage cask 1 of a nuclear reactor so as to reduce the decontamination liquid, a water supply line 19 and a discharge line 25 are provided in the bag vessel 18, and the quantity of the water in the bag vessel 18 is adjusted so as to adjust the decontamination liquid level. The decontamination water level can be adjusted so that, when cooling water in under decontamination flows therein, a state of the decontamination water n contact with all the decontamination zone can be held at all times. This constitution can decontaminate the while pressure container of the nuclear reactor using the minimum decontamination chemicals without affected by the water level fluctuation during the decontamination and at the same time shorten the time decomposing or purifying chemical decontamination liquid.

7. 发明专利

JPH07128323A METHOD FOR MEASURING AND CONTROLLING ORGANIC IMPURITIES 失效
公开(公告)号：JPH07128323A
公开(公告)日：1995-05-19
申请号：JP27644093
申请日：1993-11-05
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO , IGARASHI HIROO
IPC分类号： G01N33/18 , G01N30/64 , G01N30/88 , G21C17/02 , G21D3/08
摘要： PURPOSE:To prevent impurities from being mixed by decomposing organic impurities into organic carbon and inorganic ions, measuring the concentrations thereof simultaneously, and then estimating the type of impurities based on the measurements. CONSTITUTION:A sample containing impurities eluded from an anion-exchange resin and a cation-exchange resin are introduced to an organic compound decomposing section where the impurities are decomposed into organic carbon and other decomposition products. In this regard, wet oxidation or ultraviolet irradiation is employed and one kind of hydrogen peroxide, permanganate, chromate, or a combination thereof is selected as an oxidizing agent. The impurities eluted from the ion exchange resin produce ions of sulfuric, nitric, and nitrous and carbon dioxide. The carbon dioxide is purged with nitrogen, for example, and separated and then the concentration of organic carbon is measured by an infrared analyzer. Subsequently, inorganic ion impurities are concentrated from the remaining sample liquid and classified through elution before being identified by ion chromatography. The type of impurity is estimated based on the ratio between the organic carbon concentration and the inorganic ion impurities.

8. 发明专利

JPH0353198A SUSPENDED IRON GENERATOR AND BOILING WATER TYPE NUCLEAR POWER PLANT CONTG. THEREOF 失效
公开(公告)号：JPH0353198A
公开(公告)日：1991-03-07
申请号：JP18850489
申请日：1989-07-20
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： MIZUNIWA FUMIO , OSUMI KATSUMI , AIZAWA MOTOHIRO , SAWA TOSHIO
IPC分类号： G21D1/00 , G21D3/08
摘要： PURPOSE:To generate iron which does not contain corrosion products by dissolv ing ferrous carbonate into water, adding gas contg. oxygen to this water to remove carbon dioxide and suspending iron ions as iron hydroxide therein. CONSTITUTION:Pure water 5 is supplied via a supply piping 4 into a carbon dioxide absorption column 1 from the upper position thereof. A gas diffuser 6 is disposed in the internal lower position thereof. The mixture composed of the carbon dioxide in a carbon dioxide cylinder 7 and the gaseous nitrogen in a gaseous nitrogen cylinder 8 mixed in a mixer 9 is supplied to this diffuser 6. The water absorbing the carbon dioxide is introduced through a piping 12 having an electrical conductivity meter 10 into a ferrous carbonate dissolving vessel 2 of the ensuing stage. The vessel 2 is equipped with a bucket 22 contg. the ferrous carbonate 21, a stirrer 24, etc., and the ferrous carbonate 21 dissolves in water. This water is sent to an iron hydroxide forming vessel 3 where the ferrous carbonate is converted to the iron hydroxide. Gaseous oxygen is supplied from a gaseous oxygen cylinder 33 into the vessel 3 and the iron carbonate in the water is converted to the iron hydroxide by this gaseous oxygen and is suspended in the water.

9. 发明专利

JPH01185492A FEED WATER TUBING CIRCULATING FACILITY IN NUCLEAR POWER PLANT 失效
公开(公告)号：JPH01185492A
公开(公告)日：1989-07-25
申请号：JP833688
申请日：1988-01-20
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA YOSHITAKA , AIZAWA MOTOHIRO , OSUMI KATSUMI , ITO HISAO
IPC分类号： G21D1/00
摘要： PURPOSE:To control corrosion by connecting a piece of final stage feed water heater downstream side tubing and a piece of reactor coolant purifying device downstream side tubing by a piece of bypass tubing while a separation valve is provided between a final stage feed water heater and the bypass tubing and circulating purifying system circulating water. CONSTITUTION:A separation valve 9 is provided in the downstream side of a final stage feed water heater 24 while a reactor coolant purifying system 3 and a piece of feed water tubing 4 are connected by a piece of bypass tubing 5. When the valve 9 and a reactor coolant purifying system valve 15 are closed and a bypass tubing inlet valve 6, a bypass tubing outlet valve 7 and a reactor pressure vessel outside separation valve 16 are opened, reactor coolant purifying system circulating water is circulated by a reactor coolant purifying system pump 11 through the tubing 4, 5. Therefore, the water is circulated and stored in the tubing 4 and corrosion from the tubing 4 at the time of plant stop can be controlled.

10. 发明专利

JPS58180988A Device for cleaning inside of container 失效
标题翻译：用于清洁集装箱的装置
公开(公告)号：JPS58180988A
公开(公告)日：1983-10-22
申请号：JP6230582
申请日：1982-04-16
申请人： Hitachi Ltd , Hitachi Eng Co Ltd
发明人： SHIINA ATSUSHI , AIZU TADASHI , OOSUMI KATSUMI , SUMIDA SHIYUUSEI , AIZAWA MOTOHIRO
IPC分类号： G21C13/00
CPC分类号： Y02E30/40

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