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1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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

7. 发明专利

JP2002365397A DECONTAMINATION METHOD OF RADIOACTIVE MEMBER 失效
公开(公告)号：JP2002365397A
公开(公告)日：2002-12-18
申请号：JP2001173361
申请日：2001-06-08
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO , NAGASE MAKOTO , ANAZAWA KAZUMI , KATAOKA ICHIRO
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To provide a decontamination method of radioactive member capable of minimizing the quantity of waste. SOLUTION: In this decontamination method, a structural part of a radiation handling facility is taken as an object to be decontaminated, and an oxidative dissolution process for working an oxidizing agent to a radioactive material, adhered to the object and a reductive dissolving process using an organic acid are performed repeatedly, and a cleaning process is then performed. The cleaning process is performed after the oxidative dissolution process.

8. 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.

9. 发明专利

JPH11153695A IRON INJECTION METHOD AND DEVICE FOR REACTOR POWER PLANT 失效
公开(公告)号：JPH11153695A
公开(公告)日：1999-06-08
申请号：JP31848297
申请日：1997-11-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MOCHIZUKI KENTA , ASAKURA YAMATO , AIZAWA MOTOHIRO , ISHIDA KAZUNARI , UETAKE NAOTO
IPC分类号： G21D3/08
摘要： PROBLEM TO BE SOLVED: To prevent the grain size of crud from growing larger and reduce the fraction eluding of Ni and Co as complex oxides in the reactor, by forming a plurality of tanks for oxidizing where Fe ion is oxidized and Fe crud is produced, and forming the tanks so that Fe ion oxidizing function is higher in more downstream of flow of Fe ion-containing water. SOLUTION: Demineralized water is supplied into a CO2 gas injection tank 19 and after its conductance is raised, it is sent to an electrolysis tank 20 of iron. In the electrolysis tank 20 of iron, by electrolyzing an iron plate electrode 36 placed in parallel, Fe ion eludes in electrolyte solution. From the lower part of the electrolysis tank 20, inert gas (N2 Ar) is sent in. The electrolyte solution containing Fe ion is supplied to a tank 21 for oxidizing and nitrogen gas and air are injected to secondly oxidize. Oxygen is injected in tank 23 to the crud-containing water having passed the tank 22 and all Fe ion at this moment is made to crud as trivalent iron.

10. 发明专利

JPH05288893A 失效
公开(公告)号：JPH05288893A
公开(公告)日：1993-11-05
申请号：JP9405992
申请日：1992-04-14
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： AIZAWA MOTOHIRO , SUZUKI KAZUNOBU
IPC分类号： G21D3/08
摘要： PURPOSE:To stabilize activity concentration in reactor water by a method wherein the Cr content in a corrosion product sticking on the surface of a fuel clad tube of a boiling water nuclear power generating apparatus is controlled to be a specified percent or below. CONSTITUTION:By maintaining the Cr content in a sticking substance on the surface of fuel at 3% or below, the speed of elution of the sticking substance into reactor water can be decreased. As the result, the amount of radioactive nuclide dissolved in the reactor water can be reduced and activity concentration can be stabilized. The Cr concentration is maintained at 3% or below easily by a method wherein the concentration of an oxidizing agent in reactor feed water is maintained at 10 to 30ppb. The concentration of dissolved oxygen can be regulated by controlling the amount of oxygen injected from oxygen injecting equipment. It is desirable that the concentration of the oxidizing agent is made to approach 10ppb while Fe concentration is monitored by sampling from a amount of elution of Cr is lessened by using a material of the CR content 14.5% or below for a heat exchanger tube of a feed water heater 13. For this purpose, Mo steel not containing Cr is optimum.

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