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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

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

3. 发明专利

CA2284320C METHOD OF CHEMICAL DECONTAMINATION AND SYSTEM THEREFOR 未知
公开(公告)号：CA2284320C
公开(公告)日：2002-07-02
申请号：CA2284320
申请日：1999-09-29
申请人： KURITA ENG CO LTD , HITACHI LTD
发明人： NAGASE MAKOTO , ANAZAWA KAZUMI , ISHIDA KAZUSHIGE , TAMAGAWA TADASHI , NAKAMURA FUMITO , YOSHIKAWA HIROO , UETAKE NAOHITO
IPC分类号： G21F9/28 , G21F9/00
摘要： A chemical decontamination method and a chemical decontaminating system f or chemically decontaminating radioactive nuclides from a metallic material surface contaminated by the radioactive nuclides. The method comprises the steps of reductive decontamination using a reductive decontaminating agent containing at least two kinds of components followed by decomposition of the reductive decontaminating agent using a decomposing apparatus for decomposing at least two kinds of chemical substances in the reductive decontaminating agent. In addition, the present invention further provides a method of chemical decontamination whic h moderates corrosion of material by using a chemical decontaminating agent decomposing apparatus capable of decomposing not only the components trapped by the cation exchange resin but also components trapped by an anion exchange resin at a time. A chemical decontaminating system comprising a catalyst decompositio n column in an upstream side of an ion exchange resin column and a hydrogen peroxide injection apparatus is also provided.

4. 发明专利

CA2284320A1 METHOD OF CHEMICAL DECONTAMINATION AND SYSTEM THEREFOR 未知
公开(公告)号：CA2284320A1
公开(公告)日：2000-03-29
申请号：CA2284320
申请日：1999-09-29
申请人： HITACHI LTD , KURITA ENG CO LTD
发明人： YOSHIKAWA HIROO , UETAKE NAOHITO , ANAZAWA KAZUMI , ISHIDA KAZUSHIGE , NAGASE MAKOTO , NAKAMURA FUMITO , TAMAGAWA TADASHI
IPC分类号： G21F9/28 , G21F9/00
摘要： A chemical decontamination method and a chemical decontaminating system for chemically decontaminating radioactive nuclides from a metallic material surface contaminated by the radioactive nuclides. The method comprises the steps of reductive decontamination using a reductive decontaminating agent containing at least two kinds of components followed by decomposition of the reductive decontaminating agent using a decomposing apparatus for decomposing at least two kinds of chemical substances in the reductive decontaminating agent. In addition, the present invention further provides a method of chemical decontamination which moderates corrosion of material by using a chemical decontaminating agent decomposing apparatus capable of decomposing not only the components trapped by the cation exchange resin but also components trapped by an anion exchange resin at a time. A chemical decontaminating system comprising a catalyst decomposition column in an upstream side of an ion exchange resin column and a hydrogen peroxide injection apparatus is also provided.

5. 发明专利

CA2317795C METHOD OF CHEMICAL DECONTAMINATION 未知
公开(公告)号：CA2317795C
公开(公告)日：2004-02-03
申请号：CA2317795
申请日：2000-09-06
申请人： KURITA ENG CO LTD , HITACHI LTD
发明人： TAKAMORI YOSHIYUKI , UETAKE NAOHITO , ANAZAWA KAZUMI , YOSHIKAWA HIROO , NAGASE MAKOTO , TAMAGAWA TADASHI , ISHIDA KAZUSHIGE
IPC分类号： B08B3/08 , G21C17/022 , G21F9/00 , G21F9/28
摘要： The object is to suppress a decrease of thickness due to corrosion of structural members and to achieve a removal of radionuclides with good efficiency in a nuclear power plant. Oxidation decontamination is first conducted. An aqueous potassium permanganate solution is supplied from a circulation line (3) to a reactor pressure vessel (36), which is a stainless steel structural member, and a reactor water cleanup system piping (40) and a drain piping (46), which are carbon steel structural members. These structural members are oxidation-decontaminated by the action of potassium permanganate. Then the above-mentioned structural members are reduction-decontaminated by using an aqueous oxalic acid solution. The aqueous oxalic acid solution contains hydrazine.

6. 发明专利

CA2317795A1 METHOD OF CHEMICAL DECONTAMINATION 未知
公开(公告)号：CA2317795A1
公开(公告)日：2001-03-09
申请号：CA2317795
申请日：2000-09-06
申请人： KURITA ENG CO LTD , HITACHI LTD
发明人： TAMAGAWA TADASHI , NAGASE MAKOTO , YOSHIKAWA HIROO , TAKAMORI YOSHIYUKI , ANAZAWA KAZUMI , UETAKE NAOHITO , ISHIDA KAZUSHIGE
IPC分类号： B08B3/08 , G21C17/022 , G21F9/00 , G21F9/28
摘要： The object is to suppress a decrease of thickness due to corrosion of structural members and to achieve a removal of radionuclides with good efficiency in a nuclear power plant. Oxidation decontamination is first conducted. An aqueous potassium permanganate solution is supplied from a circulation line 3 to a reactor pressure vessel 36, which is a stainless steel structural member, and a reactor water cleanup system piping 40 and a drain piping 46, which are carbon steel structural members. These structural members are oxidation-decontaminated by the action of potassium permanganate. Then the above-mentioned structural members are reduction-decontaminated by using an aqueous oxalic acid solution. The aqueous oxalic acid solution contains hydrazine.

7. 发明专利

CA2373957A1 RADIOACTIVE SUBSTANCE DECONTAMINATION METHOD AND APPARATUS 未知
公开(公告)号：CA2373957A1
公开(公告)日：2002-10-03
申请号：CA2373957
申请日：2002-02-28
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ANAZAWA KAZUMI , NAGASE MAKOTO , SAKASHITA MOTOAKI
IPC分类号： G21F9/28 , G21F9/00
摘要： A radioactive substance decontamination method and apparatus that decontaminates a metal member contaminated by radioactive substance in a short period of time. The apparatus includes; multiple reducing decontamination tanks having different radiation control values as the upper limit values for the radiation dose of the reducing decontamination agent stored inside; a carrier for immersing the metal member into the multiple reducing decontamination tanks and a washing tank. A tube is also included for transferring into the second reducing decontamination tank where the radiation control value is the second value that is higher than the first value, the reducing decontamination agent in the first reducing decontamination tank where the radiation control value is the first value out of the multiple reducing decontamination tanks. A reducing agent decomposer is also included for decomposing a component contained in the reducing decontamination agent of the reducing decontamination tank where the radiation control value is the highest of the reducing decontamination tanks connected by the tube. Finally, a washing tank for washing the reducing decontamination agent deposited on the decontaminated metal member.

8. 发明专利

JP2001074887A CHEMICAL DECONTAMINATION METHOD 失效
公开(公告)号：JP2001074887A
公开(公告)日：2001-03-23
申请号：JP25542499
申请日：1999-09-09
申请人： HITACHI LTD , KURITA ENG CO LTD
发明人： ISHIDA KAZUNARI , ANAZAWA KAZUMI , TAKAMORI YOSHIYUKI , UETAKE NAOTO , NAGASE MAKOTO , YOSHIKAWA HIROO , TAMAGAWA TADASHI
IPC分类号： B08B3/08 , G21C17/022 , G21F9/00 , G21F9/28
摘要： PROBLEM TO BE SOLVED: To suppress the decrease in the thickness of a structure member due to corrosion for a nuclear power plant and efficiently eliminate a radioactive nuclide. SOLUTION: First, oxidation decontamination is made. A potassium permanganate solution is supplied from a circulation pipeline 3 to a reactor pressure vessel 36 that is a structure member made of stainless steel, purification system piping 40 that is a structure member made of carbon steel, and drain piping 46. The structure members are subjected to oxidation decontamination by the operation of the potassium permanganate. Then, using an oxalic acid solution, the structure member is subjected to reduction decontamination. The oxalic acid solution contains hydrazine.

9. 发明专利

JP2000121791A METHOD AND DEVICE FOR CHEMICAL DECONTAMINATION 失效
公开(公告)号：JP2000121791A
公开(公告)日：2000-04-28
申请号：JP28969598
申请日：1998-10-12
申请人： HITACHI LTD , KURITA WATER IND LTD , KURITA ENG CO LTD
发明人： MOCHIZUKI KENTA , NAGASE MAKOTO , NAKAMURA FUMITO , ANAZAWA KAZUMI , FURUKAWA SEIJI , KAZAMA MASAHIKO , YOSHIKAWA HIROO
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To efficiently remove precipitated iron oxalate by decomposing a decontaminant to remove radioactive nuclides after decontaminating a region with a reductive decontaminant containing oxalic acid and adding an oxidant to a decontamination liquid to form an oxide film on the surface of a member. SOLUTION: Oxalic acid and hydrazine are poured from a chemicals tank 8 and a pH controlling tank 10 respectively into a region 1 to be decontaminated (hereinafter referred to as the region 1) by circularly passing water in the region 1 through the manipulation of a valve. With peroxide poured into a catalyst decomposition tower 6, subsequently, the passage of water through a cation resin tower 7 begins. After the concentration of the oxalic acid in a line becomes constant, decontamination is carried out by continuously pouring only hydrazine. Then, after reducing the quantity of poured peroxide and confirming that the concentration of oxalic acid and hydrazine respectively reaches a prescribed value, water is passed through a mixture floor resin tower 14 to clean the line with the water. Next, potassium permanganate is poured from a chemicals tank to decontaminate the region 1 by oxidation. Then, oxalic acid is poured to decompose ions of permanganic acid. Afterward, the same processes are repeated to clean the region until the electric conductivity of the water in the line becomes 1 μs/cm or less.

10. 发明专利

JP2000105295A CHEMICAL DECONTAMINATION METHOD AND ITS APPARATUS 失效
公开(公告)号：JP2000105295A
公开(公告)日：2000-04-11
申请号：JP27412898
申请日：1998-09-29
申请人： HITACHI LTD , KURITA ENG CO LTD
发明人： NAGASE MAKOTO , UETAKE NAOTO , ISHIDA KAZUNARI , NAKAMURA FUMITO , ANAZAWA KAZUMI , TAMAGAWA TADASHI , YOSHIKAWA HIROO
IPC分类号： G21F9/28 , G21F9/00
摘要： PROBLEM TO BE SOLVED: To provide a chemical decontamination method using a chemical decontamination agent decomposition device for selectively decomposing a component which burdens a cation resin tower and to provide a chemical decontamination method mitigating corrosion to a material and a facility for chemical decontamination, which uses a chemical decomposition agent decomposing device capable of decomposing not only a component captured in the cation resin tower but a component captured in an anion exchange resin at the same time by using the decomposing device. SOLUTION: According to this chemical decontamination method for chemically removing radioactive nuclear species from the metal member surface contaminated with the radioactive nuclear species, after the end of a reducing decontamination process using a reducing decontamination agent containing at least two kinds of components, a decontamination agent is decomposed by a decomposing device for decomposing at least two kinds of chemical substances of the reducing decomposing material.

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