Patents by Inventor Motoaki Sakashita

Motoaki Sakashita has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8652272
    Abstract: A bath containing nickel ions and formic acid is injected into a film-forming aqueous solution flowing in a circulation pipe connected to a feed water pipe made of carbon steel in a BWR plant. This solution is supplied into the pipe through the circulation pipe, and a nickel metal film is formed on an inner surface of the pipe. After the film is formed, a film-forming aqueous solution containing iron (II) ions, formic acid, nickel ions, hydrogen peroxide, and hydrazine is supplied to the pipe. A nickel ferrite film is formed on the surface of the nickel metal film in the pipe. The nickel ferrite film comes into contact with water containing dissolved oxygen at or above 150° C. to transform the nickel metal film into a nickel ferrite film. A thick nickel ferrite film is formed on the inner surface of the feed water pipe.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: February 18, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Tsuyoshi Ito, Hideyuki Hosokawa, Yukio Hirama, Motoaki Sakashita, Makoto Nagase
  • Patent number: 8652271
    Abstract: A bath containing nickel ions and formic acid is injected into a film-forming aqueous solution flowing in a circulation pipe connected to feed water pipe made of carbon steel in a BWR plant. This film-forming aqueous solution is supplied into the feed water pipe through the circulation pipe, and then, a nickel metal film is formed on an inner surface of the feed water pipe. After the nickel metal film is formed, a film-forming aqueous solution containing iron (II) ions, formic acid, nickel ions, hydrogen peroxide, and hydrazine is supplied to the feed water pipe. A nickel ferrite film is formed on the surface of the nickel metal film in the feed water pipe. Then, the nickel ferrite film is come into contact with water containing dissolved-oxygen at 150° C. or above to transform the nickel metal film into a nickel ferrite film. A thick nickel ferrite film is formed on the inner surface of the feed water pipe. Corrosion of the carbon steel member composing the plant can further reduce.
    Type: Grant
    Filed: August 3, 2010
    Date of Patent: February 18, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Tsuyoshi Ito, Hideyuki Hosokawa, Yukio Hirama, Motoaki Sakashita, Makoto Nagase
  • Patent number: 8494107
    Abstract: A formic acid aqueous solution that contains Fe (II) ions is produced by dissolving metal iron in a formic acid aqueous solution. Nitrogen is supplied from a nitrogen supply device to a chemical liquid tank and then discharged from a discharge line to reduce the dissolved oxygen concentration in the aqueous solution. The chemical liquid tank is filled with the formic acid aqueous solution sealed with nitrogen, and is transferred from a factory to a nuclear reactor building designated as radiation-controlled areas. Inside the nuclear reactor building, the chemical liquid tank is installed in a film deposition apparatus connected to a reactor water recirculation pipeline. The formic acid aqueous is supplied from the chemical liquid tank to the inside of the reactor water recirculation pipeline, and then a ferrite film is formed on the inner surface of the reactor water recirculation pipeline.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: July 23, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota
  • Patent number: 8259894
    Abstract: A formic acid aqueous solution that contains Fe (II) ions is produced by dissolving metal iron in a formic acid aqueous solution. Nitrogen is supplied from a nitrogen supply device to a chemical liquid tank and then discharged from a discharge line to reduce the dissolved oxygen concentration in the aqueous solution. The chemical liquid tank is filled with the formic acid aqueous solution sealed with nitrogen, and transferred from a factory to a nuclear reactor building designated as radiation-controlled areas. Inside the nuclear reactor building, the chemical liquid tank is installed in a film deposition apparatus connected to a reactor water recirculation pipeline. The formic acid aqueous is supplied from the chemical liquid tank to the inside of the reactor water recirculation pipeline, and then a ferrite film is formed on the inner surface of the reactor water recirculation pipeline.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: September 4, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota
  • Publication number: 20110030850
    Abstract: A bath containing nickel ions and formic acid is injected into a film-forming aqueous solution flowing in a circulation pipe connected to feed water pipe made of carbon steel in a BWR plant. This film-forming aqueous solution is supplied into the feed water pipe through the circulation pipe, and then, a nickel metal film is formed on an inner surface of the feed water pipe. After the nickel metal film is formed, a film-forming aqueous solution containing iron (II) ions, formic acid, nickel ions, hydrogen peroxide, and hydrazine is supplied to the feed water pipe. A nickel ferrite film is formed on the surface of the nickel metal film in the feed water pipe. Then, the nickel ferrite film is come into contact with water containing dissolved-oxygen at 150° C. or above to transform the nickel metal film into a nickel ferrite film. A thick nickel ferrite film is formed on the inner surface of the feed water pipe. Corrosion of the carbon steel member composing the plant can further reduce.
    Type: Application
    Filed: August 3, 2010
    Publication date: February 10, 2011
    Applicant: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Tsuyoshi ITO, Hideyuki Hosokawa, Yukio Hirama, Motoaki Sakashita, Makoto Nagase
  • Publication number: 20090316852
    Abstract: A method for suppressing deposit of radionuclide onto structure member composing a nuclear power plant, comprising the steps of: bringing film formation liquid including iron (II) ions and either of zinc (II) ions and nickel (II) ions into contact with a surface of the structure member; and forming either of a ferrite film including the zinc and a ferrite film including the nickel on the surface of the structure member.
    Type: Application
    Filed: June 6, 2008
    Publication date: December 24, 2009
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota
  • Publication number: 20090290675
    Abstract: The present invention is a method for suppressing corrosion of carbon steel members composing a nuclear power plant. That is, the processing solution contains a chemical including iron (II) ions, an oxidizing agent for oxidizing at least one part of the iron (II) ions into iron (III) ion, and a pH adjustment agent for adjusting pH. The pH of the processing solution is adjusted in the range of 5.5 to 9.0 by the pH adjustment agent. The processing solution is introduced into a purifying system pipe having the carbon steel members. The iron (II) ions are adsorbed on an inner surface of the purifying system pipe, namely, a surface of the carbon steel members. The ferrite film is formed on the surface of the carbon steel members by oxidizing the absorbed iron (II) ions. Therefore, corrosion of the carbon steel members is suppressed by the ferrite film.
    Type: Application
    Filed: June 25, 2009
    Publication date: November 26, 2009
    Inventors: Makoto Nagase, Hideyuki Hosokawa, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota, IIchiro Kataoka
  • Publication number: 20090003507
    Abstract: The present invention is a method for suppressing corrosion of carbon steel members composing a nuclear power plant. That is, the processing solution contains a chemical including iron (II) ions, an oxidizing agent for oxidizing at least one part of the iron (II) ions into iron (III) ion, and a pH adjustment agent for adjusting pH. The pH of the processing solution is adjusted in the range of 5.5 to 9.0 by the pH adjustment agent. The processing solution is introduced into a purifying system pipe having the carbon steel members. The iron (II) ions are adsorbed on an inner surface of the purifying system pipe, namely, a surface of the carbon steel members. The ferrite film is formed on the surface of the carbon steel members by oxidizing the absorbed iron (II) ions. Therefore, corrosion of the carbon steel members is suppressed by the ferrite film.
    Type: Application
    Filed: June 27, 2007
    Publication date: January 1, 2009
    Inventors: Makoto NAGASE, Hideyuki Hosokawa, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota, Ichiro Kataoka
  • Publication number: 20090003508
    Abstract: A formic acid aqueous solution that contains Fe (II) ions is produced by dissolving metal iron in a formic acid aqueous solution. Nitrogen is supplied from a nitrogen supply device to a chemical liquid tank and then discharged from a discharge line to reduce the dissolved oxygen concentration in the aqueous solution. The chemical liquid tank is filled with the formic acid aqueous solution sealed with nitrogen, and is transferred from a factory to a nuclear reactor building designated as radiation-controlled areas. Inside the nuclear reactor building, the chemical liquid tank is installed in a film deposition apparatus connected to a reactor water recirculation pipeline. The formic acid aqueous is supplied from the chemical liquid tank to the inside of the reactor water recirculation pipeline, and then a ferrite film is formed on the inner surface of the reactor water recirculation pipeline.
    Type: Application
    Filed: April 30, 2008
    Publication date: January 1, 2009
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota
  • Publication number: 20080181351
    Abstract: A formic acid aqueous solution that contains Fe (II) ions is produced by dissolving metal iron in a formic acid aqueous solution. Nitrogen is supplied from a nitrogen supply device to a chemical liquid tank and then discharged from a discharge line to reduce the dissolved oxygen concentration in the aqueous solution. The chemical liquid tank is filled with the formic acid aqueous solution sealed with nitrogen, and transferred from a factory to a nuclear reactor building designated as radiation-controlled areas. Inside the nuclear reactor building the chemical liquid tank is installed in a film deposition apparatus connected to a reactor water recirculation pipeline. The formic acid aqueous is supplied from the chemical liquid tank to the inside of the reactor water recirculation pipeline, and then a ferrite film is formed on the inner surface of the reactor water recirculation pipeline.
    Type: Application
    Filed: June 26, 2007
    Publication date: July 31, 2008
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota
  • Publication number: 20080075886
    Abstract: A nuclear reactor structural material (for example, a spacer spring) is immersed in purified water in a treatment bath. The temperature of the purified water increased to 90° C. by a heater. Iron formate (a solution containing iron (II) ions) in an iron formate tank, hydrogen peroxide in a hydrogen peroxide tank, and hydrazine in a hydrazine tank are injected into a pipe and are guided into the treatment bath. The injection of iron formate is performed until the concentration of iron (II) ions in the purified water becomes 200 ppm or more. By injecting hydrazine, pH is adjusted in a range of from 5.5 to 9.0. A portion of a magnetite film thus formed on the structural material is then removed, e.g., by applying ultrasonic waves. With this process, a fine strong magnetite film for suppressing the elution of cobalt from the nuclear reactor structural material is formed on the surface of the nuclear reactor structural material.
    Type: Application
    Filed: August 16, 2007
    Publication date: March 27, 2008
    Inventors: Makoto NAGASE, Hideyuki Hosokawa, Kazushige Ishida, Satoshi Morisawa, Motoaki Sakashita, Motohiro Aizawa
  • Patent number: 6982060
    Abstract: An object of the present invention is to provide a chemical decontamination liquid decomposing system having a catalyst tower which has a mesh filter capable of certainly preventing catalyst from flowing out and a mechanism of pushing-down the catalyst capable of preventing convection of the catalyst caused by decomposition gas. The catalyst tower in accordance with the present invention used for decomposing a chemical decontamination liquid comprises an inlet pipe, a catalyst for decomposing the chemical decontamination liquid, an outlet mesh filter for preventing the catalyst from flowing out, an outlet pipe, a catalyst charging port for charging the catalyst, a catalyst pushing-down mechanism for preventing occurrence of convection of the catalyst caused by a decomposed gas and so on. The outlet mesh filter is arranged so as to closely attached to the inner surface of the catalyst tower and to the inner surface of the catalyst charging port.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: January 3, 2006
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Motoaki Sakashita, Katsuo Yokota, Yasushi Kobayashi, Kazumi Anazawa
  • Patent number: 6907891
    Abstract: A radioactive substance decontamination method and apparatus which decontaminates a metal member contaminated by radioactive substance in a short period of time. This apparatus has (1) multiple reducing decontamination tanks having different radiation control values; (2) a carrier for immersing the metal member into the multiple reducing decontamination tanks and a washing tank; (3) a tube for transferring into the second reducing decontamination tank the reducing decontamination agent in the first reducing decontamination tank; (4) a reducing agent decomposer for decomposing a component contained in the reducing decontamination agent of the reducing decontamination tank where the radiation control value is the highest out of the reducing decontamination tanks connected by the tube; and (5) a washing tank for washing the reducing decontamination agent deposited on the decontaminated metal member.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: June 21, 2005
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Kazumi Anazawa, Motoaki Sakashita, Makoto Nagase
  • Publication number: 20050014989
    Abstract: A radioactive substance decontamination method and apparatus which decontaminates a metal member contaminated by radioactive substance in a short period of time. This apparatus has (1) multiple reducing decontamination tanks having different radiation control values; (2) a carrier for immersing the metal member into the multiple reducing decontamination tanks and a washing tank; (3) a tube for transferring into the second reducing decontamination tank the reducing decontamination agent in the first reducing decontamination tank; (4) a reducing agent decomposer for decomposing a component contained in the reducing decontamination agent of the reducing decontamination tank where the radiation control value is the highest out of the reducing decontamination tanks connected by the tube; and (5) a washing tank for washing the reducing decontamination agent deposited on the decontaminated metal member.
    Type: Application
    Filed: March 24, 2004
    Publication date: January 20, 2005
    Inventors: Kazumi Anazawa, Motoaki Sakashita, Makoto Nagase
  • Publication number: 20040234413
    Abstract: An object of the present invention is to provide a chemical decontamination liquid decomposing system having a catalyst tower which has a mesh filter capable of certainly preventing catalyst from flowing out and a mechanism of pushing-down the catalyst capable of preventing convection of the catalyst caused by decomposition gas.
    Type: Application
    Filed: June 14, 2004
    Publication date: November 25, 2004
    Applicant: Renesas Technology Corp
    Inventors: Motoaki Sakashita, Katsuo Yokota, Yasushi Kobayashi, Kazumi Anazawa
  • Patent number: 6767519
    Abstract: An object of the present invention is to provide a chemical decontamination liquid decomposing system having a catalyst tower which has a mesh filter capable of certainly preventing catalyst from flowing out and a mechanism of pushing-down the catalyst capable of preventing convection of the catalyst caused by decomposition gas. The catalyst tower in accordance with the present invention used for decomposing a chemical decontamination liquid comprises an inlet pipe, a catalyst for decomposing the chemical decontamination liquid, an outlet mesh filter for preventing the catalyst from flowing out, an outlet pipe, a catalyst charging port for charging the catalyst, a catalyst pushing-down mechanism for preventing occurrence of convection of the catalyst caused by a decomposed gas and so on. The outlet mesh filter is arranged so as to closely attached to the inner surface of the catalyst tower and to the inner surface of the catalyst charging port.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: July 27, 2004
    Assignees: Hitachi, Ltd., Hitachi Engineering Co. Ltd.
    Inventors: Motoaki Sakashita, Katsuo Yokota, Yasushi Kobayashi, Kazumi Anazawa
  • Publication number: 20030052063
    Abstract: A chemical decontamination apparatus an oxidizing solution reservoir for storing oxidizing agent decontamination agent of a decontamination tank subsequent to oxidizing decontamination, a reducing solution reservoir for storing reducing agent decontamination agent of the aforementioned decontamination tank subsequent to reducing agent decontamination, and a transfer pump for mutual transfer of decontamination agent between the aforementioned decontamination tank and reservoir; and is designed to permit repeated use of decontamination agent.
    Type: Application
    Filed: March 15, 2002
    Publication date: March 20, 2003
    Inventors: Motoaki Sakashita, Kazumi Anazawa, Ichirou Kataoka
  • Publication number: 20030006198
    Abstract: A chemical decontamination apparatus an oxidizing solution reservoir for storing oxidizing agent decontamination agent of a decontamination tank subsequent to oxidizing decontamination, a reducing solution reservoir for storing reducing agent decontamination agent of the aforementioned decontamination tank subsequent to reducing agent decontamination, and a transfer pump for mutual transfer of decontamination agent between the aforementioned decontamination tank and reservoir; and is designed to permit repeated use of decontamination agent.
    Type: Application
    Filed: July 12, 2002
    Publication date: January 9, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Motoaki Sakashita, Kazumi Anazawa, Ichirou Kataoka
  • Publication number: 20030004391
    Abstract: A radioactive substance decontamination method and apparatus which decontaminate the metal member contaminated by radioactive substance in a shorter period of time.
    Type: Application
    Filed: July 12, 2002
    Publication date: January 2, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Kazumi Anazawa, Motoaki Sakashita, Makoto Nagase
  • Publication number: 20020143224
    Abstract: A radioactive substance decontamination method and apparatus which decontaminate the metal member contaminated by radioactive substance in a shorter period of time.
    Type: Application
    Filed: February 21, 2002
    Publication date: October 3, 2002
    Inventors: Kazumi Anazawa, Motoaki Sakashita, Makoto Nagase