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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

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.

3. 发明专利

JP2000056087A CHEMICAL DECONTAMINATING METHOD AND DEVICE THEREFOR 失效
公开(公告)号：JP2000056087A
公开(公告)日：2000-02-25
申请号：JP22262698
申请日：1998-08-06
申请人： HITACHI LTD , KURITA ENG CO LTD , KURITA WATER IND LTD
发明人： NAGASE MAKOTO , NAKAMURA FUMITO , ANAZAWA KAZUMI , YOSHIKAWA HIROO , FURUKAWA SEIJI
IPC分类号： G21C19/307 , G21F9/28
摘要： PROBLEM TO BE SOLVED: To make the water in the outlet of a resin tower satisfy a drainable quality condition and simultaneously attain the reduction in concentration of a decontaminating agent and the regulation of water level by decomposing a reductive decontaminating agent guided from a part to be intended and passing water to a mix bed resin tower. SOLUTION: In decontamination process, a reactor recirculating pump 3 is started, and the temperature is raised by use of a circulating pump 5 and a heater 6. When the temperature reaches a prescribed temperature (90±5 deg.C), oxalic acid as reductive decontaminating agent any hydrazine as pH regulating agent are injected from a chemical tank 26 to a reactor 1 by use of a chemical injection pump 27. When the oxalic acid concentration reaches a prescribed concentration (0.2%), the chemical injection pump 27 is stopped to end the injection of oxalic acid, and reductive decontamination is performed. The cracked gas generated in a reducing agent decomposing device 16 is separated in a surge tank 17 and returned to the reactor 1 through a degassing line 24. Since most of oxalic acid of the decontaminating solution flowing from the tank 17 is decomposed, the decontaminating solution is cooled to 80 deg.C or lower by a cooler 18 and then guided to a mix bed ion exchange resin 19 to remove the undecomposed oxalic acid, metal ions and the like.

4. 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.

5. 发明专利

JP2002259647A SYSTEM, METHOD AND PROGRAM FOR MANAGING WORK ON CONTAMINATED SITE 失效
公开(公告)号：JP2002259647A
公开(公告)日：2002-09-13
申请号：JP2001059884
申请日：2001-03-05
申请人： KURITA WATER IND LTD , KURITA ENG CO LTD
发明人： FUKUMOTO TOSHIHARU , YOSHIKAWA HIROO , UCHIDA TOSHIHITO , ICHIKAWA KAZUTOSHI
IPC分类号： G06Q10/00 , G06Q10/06 , G06Q50/00 , G06Q50/10 , G08B21/12 , G06F17/60
摘要： PROBLEM TO BE SOLVED: To more exactly manage a dioxin exposure quantity to each of workers. SOLUTION: According to worker information, which is inputted from an input part 1 and stored on a worker database 2 each time a workers enters/ leaves a contaminated area, work history, protector state information and working place information stored on a working place database 3, an input and output/arithmetic unit 4 estimates the dioxin exposure quantity each time the worker enters/leaves the contaminated area and according to the estimated dioxin exposure quantity, work limit information to the worker is generated. Besides, when estimating the dioxin exposure quantity, it is reflected with a protector coefficient stored on the worker database 2. The work limit information of the worker is displayed by an output part 5.

6. 发明专利

JP2002256718A ENTRY/EXIT FACILITY FOR DIOXIN CONTROL AREA 失效
公开(公告)号：JP2002256718A
公开(公告)日：2002-09-11
申请号：JP2001059883
申请日：2001-03-05
申请人： KURITA WATER IND LTD , KURITA ENG CO LTD
发明人： UCHIDA TOSHIHITO , ISHIZUKA KAORU , FUKUMOTO TOSHIHARU , YOSHIKAWA HIROO
IPC分类号： E04H5/02 , B08B3/02 , B08B5/02 , B08B7/00 , F24F7/06
摘要： PROBLEM TO BE SOLVED: To provide an entry/exit facility for a dioxin control area preventing the leakage of dioxins from the dioxin control area to a non-control area while securing safety for operators. SOLUTION: The entry/exit facility includes a first communication chamber 4 provided between the dioxin control area 2 and the non-control area 3 and provided on the side of the non-control area 3; an access way 6 for guiding the operators entering the control area 2 from the first communication chamber 4 to the control area 2; and an exit way 7 for guiding the operators exiting the control area 2 to the first communication chamber 4. The first communication chamber 4 includes a protector wearing room 8 where the operators entering the control area wear protectors, and a protector takeoff room 9 where the operators exiting the control area take off the protectors. The wearing room 8 and the takeoff room 9 are separated by a separating means 10, whereby an access way A for the operators entering the control area and an exit way B for the operators exiting the control area are separated from each other.

7. 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

8. 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.

9. 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.

10. 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.

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