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1. 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.

2. 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.

3. 发明专利

JPS6238247A METHOD FOR REGENERATING ION EXCHANGE RESIN 失效
公开(公告)号：JPS6238247A
公开(公告)日：1987-02-19
申请号：JP17587685
申请日：1985-08-12
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： OSUMI KATSUMI , MIZUNIWA FUMIO , SHINDO KIICHI , AKAMINE KAZUHIKO , AIZAWA MOTOHIRO
IPC分类号： C02F1/42 , B01J49/00 , G21F9/00 , G21F9/12
摘要： PURPOSE:To reduce the amount of regenerating chemicals and to prolong the life of an ion exchange resin, by regenerating a chelate agent forming a complex along with the metal ion adsorbed by the ion exchange resin by a solution containing regenerating chemicals in an amount equivalent to or slightly more than the metal ion. CONSTITUTION:The chelate agent forming a complex along with the main metal ion adsorbed by an ion exchange resin is regenerated by a solution containing regenerating chemicals in an amount equivalent to or slightly more than the aforementioned metal ion. For example, when the cation exchange resin of a condensation desalting device of a boiling water atomic power plant is regenerated, the amount of the chelate agent contained in the regenerated solution is set to one equal to or more than a mol number necessary for forming a neutral or negative complex along with the metal contained in said ion exchange resin to perform regeneration. The amount of the regenerating solution is suitably adjusted to 1/4-1/2 the amount of the ion exchange resin. Further, it is suitable to perform regeneration by stirring the ion exchange resin and the regenerating solution by air bubbles.

4. 发明专利

JPS59216636A Regeneration of ion exchange substance 失效
标题翻译：离子交换物质的再生
公开(公告)号：JPS59216636A
公开(公告)日：1984-12-06
申请号：JP9073983
申请日：1983-05-25
申请人： Hitachi Eng Co Ltd , Hitachi Kyowa Kogyo Kk , Hitachi Ltd
发明人： NISHIMURA YUUSAKU , OOSUMI KATSUMI , IGARASHI HIROO , AIZAWA MOTOHIRO , MORISHIMA MASASHI
IPC分类号： C02F1/42 , B01J49/00 , B01J49/02
摘要： PURPOSE: To enable effective regeneration by a small amount of a regenerating agent, by attaining to optimize the concn. of the regenerating agent in consideration of the reactive characteristics and ion exchange selectivity of a desalting capacity reduced ion exchange substance and the regenerating agent.
CONSTITUTION: In a method for performing regeneration by passing a regenerating liquid through a desalting capacity reduced ion exchange substance, the concn. of the regenerating agent in the regenerating liquid is changed over a part or the entire section of a regenerating liquid passing time with the elapse of the regenerating liquid passing time. For example, in regenerating a Na-type ion exchange resin reduced in desalting capacity with H
2 SO
4 , the concn. of the regenerating agent is made high at the initial stage in the passage of the regenerating agent when the Na
+ -amount of the resin phase is much while the concn. of the regenerating agent is reduced at the terminal period of the passage when the Na
+ -amount of the resin phase is reduced. Because the excessive passage of the regenerating agent is avoided, regeneration at a low level as compared with a conventional method is enabled.
COPYRIGHT: (C)1984,JPO&Japio
摘要翻译：目的：通过少量再生剂实现有效再生，通过优化浓缩液考虑到脱盐能力降低的离子交换物质和再生剂的反应特性和离子交换选择性的再生剂。构成：在再生液通过脱盐能力降低的离子交换物质进行再生的方法中，在再生液体通过时间过去的再生液通过时间的一部分或全部切换再生液中的再生剂。例如，在用H 2 SO 4还原脱盐能力的Na型离子交换树脂再生时，在树脂相的Na +量多的同时，在再生剂通过的初始阶段使再生剂高。当树脂相的Na +量减少时，在通道的最后期间还原再生剂。因为避免了再生剂的过度通过，所以与常规方法相比能够进行低水平的再生。

5. 发明专利

JPH041599A REDUCING METHOD FOR RADIOACTIVE MATERIAL OF ATOMIC ENERGY POWER PLANT 失效
公开(公告)号：JPH041599A
公开(公告)日：1992-01-07
申请号：JP10034890
申请日：1990-04-18
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： AIZAWA MOTOHIRO , OSUMI KATSUMI , MIZUNIWA FUMIO , SUZUKI KAZUNOBU
IPC分类号： G21D3/08
摘要： PURPOSE:To improve reliability for the control of iron density by injecting soluble iron salt in a method by which the density of a radioactive material in nuclear reactor water can be reduced by controlling the density of iron and nickel in supply water. CONSTITUTION:The supply of pure water to a dissolver 1 is performed by a supply water piping 21, and the supply and the stoppage of the supply water are performed with a valve 22. Also, it is possible to attach controllability to perform the adjustment of a water level by a water level meter 19, and to automatically close the valve 22 by an instruction for an upper limit water level, and to automatically open the valve by the instruction for a low limit water level. A diffusion tube 23 and a supply pipe 24 for nitrogen gas and carbon dioxide gas connected to the tube 23 are provided to obtain carbonic acid required for the dissolution of ferrous carbonic acid. The quantity of dissolution of the ferrous carbonic acid is adjusted by varying water carbonic acid density by the voltage division control of the carbon dioxide. In such a case, the quantity of dissolution can be stabilized by controlling the temperature of liquid by keeping constant by a humidifier 18 and a thermometer 20.

6. 发明专利

JPH0416795A IRON INJECTOR FOR REACTOR FEED WATER OF BOILING WATER REACTOR POWER PLANT 失效
公开(公告)号：JPH0416795A
公开(公告)日：1992-01-21
申请号：JP12204390
申请日：1990-05-11
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： AIZAWA MOTOHIRO , KATAOKA ICHIRO , OSUMI KATSUMI , ICHIMURA AKIRA , SAWA TOSHIO
IPC分类号： G21D3/08 , G21D1/00 , G21F9/28
摘要： PURPOSE:To improve efficiency of iron injection by injecting iron in the form of crud instead of ion into reactor feed water. CONSTITUTION:The feed water flowing through a pipe 36 into a tank 1 is elevated in its electric conductivity by injecting carbon dioxide gas from a nozzle 4, and flows through a pipe 13, into an electrolysis tank 2, and then between iron plate electrodes 5 where iron ion is solved in by electrolysis. By injecting inert gas in the tank 2 from a nozzle 6 bellow the electrodes, stripping of oxigen gas and clearing of extraneous matter on the electrodes are made during the electrolysis. The water including iron ion made in the electrolysis tank 2 flows through a pipe 14 into a reaction tank 8 where the iron ion is changed into crud of iron hydroxide or iron oxide by injecting air from a nozzle 8'. The said carbon dioxide gas, inert gas and air supplied are exhausted from nozzles 55 at the top of the tanks 2 and 8, and the water including crud-form iron made in the above way is injected into the reactor feed water through a pipe 56 and a water injection pump 15.

7. 发明专利

JPH08170999A METHOD AND DEVICE FOR CONTROLLING REACTOR WATER IN NUCLEAR POWER PLANT 失效
公开(公告)号：JPH08170999A
公开(公告)日：1996-07-02
申请号：JP31446594
申请日：1994-12-19
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： AIZAWA MOTOHIRO , SUZUKI KAZUNOBU , OSUMI KATSUMI
IPC分类号： G21C17/02 , G21D3/08
摘要： PURPOSE: To make it possible to reduce the radiation concentration in reactor water at a boiling-water nuclear power plant at all times. CONSTITUTION: The concentration of an injected liquid dissolving metal ions is regulated in a concentration regulating tank 22, and it is supplied to the primary cooling water system by an injecting pump 33. In this process, the concentration of the liquid injected into the concentration regulating tank 22 and the quantity of that injected into the primary cooing water system are regulated so that the equivalent concentration of the metal ions as cations in the reactor water may range from half to twice of that of chromic acid as anions.

8. 发明专利

JPH04346098A METHOD AND EQUIPMENT FOR INJECTING IRON INTO FEED WATER OF BOILING WATER TYPE NUCLEAR POWER PLANT 失效
公开(公告)号：JPH04346098A
公开(公告)日：1992-12-01
申请号：JP12029991
申请日：1991-05-24
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： AIZAWA MOTOHIRO , OSUMI KATSUMI , NISHINO YOSHITAKA , SUZUKI KAZUNOBU
IPC分类号： G21D3/08
摘要： PURPOSE:To obtain a method of injecting iron while checking up the quantity of amorphous iron being effective for production of a composite oxide of Ni and NiFe2O4 coexisting in a feed water system, and equipment for injecting the iron which can suppress reduction of the amorphous iron due to sticking on an injection piping and the feed water system, in regard to a technique of injecting the iron for producing the composite oxide in order to stabilize radioactive concentration in reactor water of a boiling water type nuclear power plant. CONSTITUTION:The quantity of injected iron is controlled by checking up the chemical form of the iron in feed water at an outlet of the final stage of a feed water heater. In equipment for injecting the iron, partition plates 3 are provided for forming a meandering flow passage in a reaction bath 2 wherein iron ions produced in an electrolytic bath 1 are oxidized to be an iron clad, and a time for stabilization of the iron clad in the reaction bath 2 is ensured. Moreover the time for stabilization may be ensured by providing a circulation line branching from an injection piping 9 and returning to the reaction bath 2. In another way, a stabilizing tank for making a carbon dioxide gas be adsorbed on the iron clad for stabilizing the clad is provided on the downstream side of the reaction bath 2.

9. 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.

10. 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.

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