Patents by Inventor Kazushige Ishida

Kazushige Ishida 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).

  • Publication number: 20200055758
    Abstract: The present disclosure provides a method for relieving a corrosive environment of a boiling water reactor, the method including a step of injecting hydrogen and a noble metal compound into water to be replenished into the reactor pressure vessel during a period of a generating operation of a boiling water nuclear power plant including the reactor pressure vessel. In the method, the hydrogen is injected into water to be supplied into the reactor pressure vessel, and the noble metal compound is injected into water in a line of the boiling water nuclear power plant in which a concentration of oxygen or hydrogen peroxide is stoichiometrically higher than the concentration of hydrogen at which hydrogen undergoes a chemical reaction to turn to water.
    Type: Application
    Filed: September 20, 2019
    Publication date: February 20, 2020
    Inventors: Kazushige ISHIDA, Youichi WADA, Masahiko TACHIBANA, Nobuyuki OOTA, Ryosuke SHIMIZU, Mayu SASAKI
  • Publication number: 20200013519
    Abstract: A chemical decontamination method includes a dissolution step in which a radioactive insoluble substance containing a metal oxide, the radioactive insoluble substance being adhered to a decontamination object including carbon steel, is dissolved in a decontamination solution and a metal-ion removal step in which the decontamination solution containing the metal ion, the decontamination solution being produced in the dissolution step, is brought into contact with a cation-exchange resin in order to remove the metal ion, the dissolution step including a reductive dissolution step conducted using a decontamination solution containing formic acid, ascorbic acid and/or erythorbic acid, and a corrosion inhibitor.
    Type: Application
    Filed: March 1, 2018
    Publication date: January 9, 2020
    Inventors: Masahiko KAZAMA, Naobumi TSUBOKAWA, Kazushige ISHIDA, Satoshi OUCHI, Junji IWASA
  • Patent number: 10504628
    Abstract: An aqueous solution of alkali hexahydroxo platinate is produced. As a alkali hexahydroxo platinate, sodium hexahydroxoplatinate or potassium hexahydroxoplatinate is used. The aqueous solution of alkali hexahydroxo platinate is passed through a hydrogen form cation exchange resin layer in a cation exchange resin tower. The aqueous solution of alkali hexahydroxo platinate makes contact with the hydrogen form cation exchange resin of the hydrogen form cation exchange resin layer, thus a suspension of hexahydroxo platinic is generated. If gamma rays are irradiated to the suspension, a platinum oxide colloidal solution in which colloidal particles including a platinum dioxide, a platinum monoxide, and a platinum hydroxide exist is generated. In a platinum oxide colloidal solution, the content of impurities is little and a noble metal compound is dispersed stably in water.
    Type: Grant
    Filed: May 1, 2017
    Date of Patent: December 10, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazushige Ishida, Masahiko Tachibana, Yoichi Wada, Nobuyuki Ota
  • Patent number: 10457583
    Abstract: The present disclosure provides a method for relieving a corrosive environment of a boiling water reactor, the method including a step of injecting hydrogen and a noble metal compound into water to be replenished into the reactor pressure vessel during a period of a generating operation of a boiling water nuclear power plant including the reactor pressure vessel. In the method, the hydrogen is injected into water to be supplied into the reactor pressure vessel, and the noble metal compound is injected into water in a line of the boiling water nuclear power plant in which a concentration of oxygen or hydrogen peroxide is stoichiometrically higher than the concentration of hydrogen at which hydrogen undergoes a chemical reaction to turn to water.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: October 29, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazushige Ishida, Youichi Wada, Masahiko Tachibana, Nobuyuki Oota, Ryosuke Shimizu, Mayu Sasaki
  • Patent number: 10083769
    Abstract: In an electrodeposition treatment of an iron-group metal ion-containing liquid, without being influenced by the properties of the iron-group metal ion-containing liquid, iron-group metal ions are efficiently removed from the liquid by precipitation. An anode chamber 2A provided with an anode 2 and a cathode chamber 3A provided with a cathode 3 are separated from each other by a cation exchange membrane 5, an iron-group metal ion-containing liquid is charged into the anode chamber 2A, a cathode liquid is charged into the cathode chamber 3A, and by applying the voltage between the anode 2 and the cathode 3, iron-group metal ions in the liquid in the anode chamber 2A are moved into the liquid in the cathode chamber 3A through the cation exchange membrane 5, so that an iron-group metal is precipitated on the cathode 3.
    Type: Grant
    Filed: October 20, 2014
    Date of Patent: September 25, 2018
    Assignees: KURITA WATER INDUSTRIES LTD., HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Shingo Miyamoto, Mamoru Iwasaki, Mami Hirose, Motohiro Aizawa, Nobuyuki Ota, Takako Sumiya, Kazushige Ishida
  • Publication number: 20180080115
    Abstract: There is provided an adhesion restraint method of a radionuclide to a carbon steel material of an atomic energy plant, in which an adhesion restraint effect of the radionuclide to the carbon steel material can continue for a longer term. A film forming apparatus is connected to a carbon steel purification system pipe of a BWR plant. A nickel formate aqueous solution and hydrazine are injected into a circulation pipe of the film forming apparatus. An aqueous solution including nickel formate and hydrazine is guided into a purification system pipe subjected to chemical decontamination, and a nickel metal film is formed on an inner surface of the pipe. A platinum ion aqueous solution and hydrazine are injected into the circulation pipe, and an aqueous solution including a platinum ion and hydrazine is supplied to the purification system pipe so as to adhere platinum to the surface of a nickel metal film. The film forming apparatus is detached from the purification system pipe, and the BWR plant is started.
    Type: Application
    Filed: August 7, 2017
    Publication date: March 22, 2018
    Inventors: Tsuyoshi ITOU, Hideyuki HOSOKAWA, Nobuyuki OOTA, Satoshi OOUCHI, Shintarou YANAGISAWA, Mizuho TSUYUKI, Makoto NAGASE, Kazushige ISHIDA, Toru KAWASAKI
  • Publication number: 20180079663
    Abstract: A method in which an anode chamber and a cathode chamber are separated by a cation exchange membrane, an acid solution containing metal ions is introduced into the anode chamber, a cathode solution is introduced into the cathode chamber, and a current is applied across the anode and the cathode, whereby the metal ions in the solution in the anode chamber pass through the cation exchange membrane, move into the cathode solution, and precipitate as metal onto the cathode, wherein there are minimal instances where electrodeposition is impossible or the electrodeposition rate decreases. Pre-adding a salt of the acid contained in the acid solution makes it possible to suppress concentration-diffusion of the acid from the acid solution. Adding a salt of the acid into the cathode chamber makes it possible to reduce the impressed voltage, reduce the amount of hydrogen generated on the cathode, and reduce the amount of power.
    Type: Application
    Filed: March 30, 2016
    Publication date: March 22, 2018
    Inventors: Shingo MIYAMOTO, Mami HIROSE, Mamoru IWASAKI, Hideyuki KOMORI, Motohiro AIZAWA, Nobuyuki OTA, Takako SUMIYA, Kazushige ISHIDA
  • Publication number: 20170287573
    Abstract: The present disclosure provides a method for relieving a corrosive environment of a boiling water reactor, the method including a step of injecting hydrogen and a noble metal compound into water to be replenished into the reactor pressure vessel during a period of a generating operation of a boiling water nuclear power plant including the reactor pressure vessel. In the method, the hydrogen is injected into water to be supplied into the reactor pressure vessel, and the noble metal compound is injected into water in a line of the boiling water nuclear power plant in which a concentration of oxygen or hydrogen peroxide is stoichiometrically higher than the concentration of hydrogen at which hydrogen undergoes a chemical reaction to turn to water.
    Type: Application
    Filed: January 30, 2017
    Publication date: October 5, 2017
    Inventors: Kazushige ISHIDA, Youichi WADA, Masahiko TACHIBANA, Nobuyuki OOTA, Ryosuke SHIMIZU, Mayu SASAKI
  • Publication number: 20170236604
    Abstract: An aqueous solution of alkali hexahydroxo platinate is produced. As a alkali hexahydroxo platinate, sodium hexahydroxoplatinate or potassium hexahydroxoplatinate is used. The aqueous solution of alkali hexahydroxo platinate is passed through a hydrogen form cation exchange resin layer in a cation exchange resin tower. The aqueous solution of alkali hexahydroxo platinate makes contact with the hydrogen form cation exchange resin of the hydrogen form cation exchange resin layer, thus a suspension of hexahydroxo platinic is generated. If gamma rays are irradiated to the suspension, a platinum oxide colloidal solution in which colloidal particles including a platinum dioxide, a platinum monoxide, and a platinum hydroxide exist is generated. In a platinum oxide colloidal solution, the content of impurities is little and a noble metal compound is dispersed stably in water.
    Type: Application
    Filed: May 1, 2017
    Publication date: August 17, 2017
    Inventors: Kazushige ISHIDA, Masahiko TACHIBANA, Yoichi WADA, Nobuyuki OTA
  • Publication number: 20160247589
    Abstract: In an electrodeposition treatment of an iron-group metal ion-containing liquid, without being influenced by the properties of the iron-group metal ion-containing liquid, iron-group metal ions are efficiently removed from the liquid by precipitation. An anode chamber 2A provided with an anode 2 and a cathode chamber 3A provided with a cathode 3 are separated from each other by a cation exchange membrane 5, an iron-group metal ion-containing liquid is charged into the anode chamber 2A, a cathode liquid is charged into the cathode chamber 3A, and by applying the voltage between the anode 2 and the cathode 3, iron-group metal ions in the liquid in the anode chamber 2A are moved into the liquid in the cathode chamber 3A through the cation exchange membrane 5, so that an iron-group metal is precipitated on the cathode 3.
    Type: Application
    Filed: October 20, 2014
    Publication date: August 25, 2016
    Inventors: Shingo MIYAMOTO, Mamoru IWASAKI, Mami HIROSE, Motohiro AIZAWA, Nobuyuki OTA, Takako SUMIYA, Kazushige ISHIDA
  • Patent number: 9336913
    Abstract: Disclosed is a method for treating a radioactive organic waste, the radioactive organic waste including a cation exchange resin adsorbing radionuclide ions, the method including the step of bringing the radioactive organic waste into contact with an organic acid salt aqueous solution containing an organic acid salt and whereby desorbing the radionuclide ions from the cation exchange resin, in which the organic acid salt contained in the organic acid salt aqueous solution includes a cation that is more readily adsorbable by the cation exchange resin than hydrogen ion is. This enables reduction in concentration of a radioactive substance in the radioactive organic waste and reduction in amount of a high-dose radioactive waste.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: May 10, 2016
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Takako Sumiya, Kenji Noshita, Kazushige Ishida, Nozomu Nagayama, Mamoru Kamoshida, Atsushi Yukita
  • Patent number: 9299463
    Abstract: A noble metal injection apparatus is connected to a piping of a nuclear plant at the time of stop of the nuclear plant before start of the nuclear plant. In chemical decontamination, oxidation decontamination agent decomposition, and reduction decontamination on an inner surface of the pipe system are executed. After reduction decontamination, a part of an oxalic acid included in a reduction decontamination solution is decomposed and platinum is injected into the reduction decontamination solution of pH 3.5 or higher. When the platinum concentration becomes a preset concentration, a reduction agent is injected and the reduction decontamination solution including the platinum and reduction agent is brought into contact with the inner surface of the piping. The platinum is deposited on the inner surface of the piping. The injection of the platinum and reduction agent is stopped and the platinum and reduction agent are decomposed.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: March 29, 2016
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Tsuyoshi Ito, Hideyuki Hosokawa, Makoto Nagase, Yoichi Wada, Kazushige Ishida, Motohiro Aizawa
  • Patent number: 9230699
    Abstract: A circulation pipe of a chemical decontamination apparatus including a malonic acid injection apparatus and an oxalic acid injection apparatus is connected to a purification system pipe, which is made of carbon steel, of a boiling water nuclear power plant. A malonic acid aqueous solution is injected from the malonic acid injection apparatus into the circulation pipe. An oxalic acid aqueous solution is injected from the oxalic acid injection apparatus into the circulation pipe. A reduction decontaminating solution including a malonic acid of 5200 ppm and an oxalic acid within a range of 50 to 400 ppm is supplied into the purification system pipe through the circulation pipe. Reduction decontamination for an inner surface of the purification system pipe is executed. After the reduction decontamination for the purification system pipe finishes, the malonic acid and oxalic acid included in the solution are decomposed and furthermore, the solution is purified.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: January 5, 2016
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazushige Ishida, Hideyuki Hosokawa, Motohiro Aizawa
  • Publication number: 20150073198
    Abstract: A circulation pipe of a chemical decontamination apparatus including a malonic acid injection apparatus and an oxalic acid injection apparatus is connected to a purification system pipe, which is made of carbon steel, of a boiling water nuclear power plant. A malonic acid aqueous solution is injected from the malonic acid injection apparatus into the circulation pipe. An oxalic acid aqueous solution is injected from the oxalic acid injection apparatus into the circulation pipe. A reduction decontaminating solution including a malonic acid of 5200 ppm and an oxalic acid within a range of 50 to 400 ppm is supplied into the purification system pipe through the circulation pipe. Reduction decontamination for an inner surface of the purification system pipe is executed. After the reduction decontamination for the purification system pipe finishes, the malonic acid and oxalic acid included in the solution are decomposed and furthermore, the solution is purified.
    Type: Application
    Filed: August 4, 2014
    Publication date: March 12, 2015
    Inventors: Kazushige ISHIDA, Hideyuki HOSOKAWA, Motohiro AIZAWA
  • Publication number: 20140378734
    Abstract: Disclosed is a method for treating a radioactive organic waste, the radioactive organic waste including a cation exchange resin adsorbing radionuclide ions, the method including the step of bringing the radioactive organic waste into contact with an organic acid salt aqueous solution containing an organic acid salt and whereby desorbing the radionuclide ions from the cation exchange resin, in which the organic acid salt contained in the organic acid salt aqueous solution includes a cation that is more readily adsorbable by the cation exchange resin than hydrogen ion is. This enables reduction in concentration of a radioactive substance in the radioactive organic waste and reduction in amount of a high-dose radioactive waste.
    Type: Application
    Filed: June 19, 2014
    Publication date: December 25, 2014
    Inventors: Takako SUMIYA, Kenji NOSHITA, Kazushige ISHIDA, Nozomu NAGAYAMA, Mamoru KAMOSHIDA, Atsushi YUKITA
  • Patent number: 8774342
    Abstract: In the boiling water nuclear plant of the present invention, a steam dryer is disposed in a reactor pressure vessel. Materials that have capability of capturing nitrogen compounds containing N-16 are supported on porous member. The porous members are placed in a region where steam goes through in the steam dryer. For example, both or either of perforated plates installed in the steam dryer is constituted of the porous member on which N-16 capture material is supported. When steam containing N-16 goes through the perforated plates, the N-16 is captured by the porous member, whereby the N-16 transfer amount into the turbine system is reduced.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: July 8, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Yuko Hino, Kazushige Ishida, Naoshi Usui
  • Publication number: 20140140465
    Abstract: An aqueous solution of alkali hexahydroxo platinate is produced. As a alkali hexahydroxo platinate, sodium hexahydroxoplatinate or potassium hexahydroxoplatinate is used. The aqueous solution of alkali hexahydroxo platinate is passed through a hydrogen form cation exchange resin layer in a cation exchange resin tower. The aqueous solution of alkali hexahydroxo platinate makes contact with the hydrogen form cation exchange resin of the hydrogen form cation exchange resin layer, thus a suspension of hexahydroxo platinic is generated. If gamma rays are irradiated to the suspension, a platinum oxide colloidal solution in which colloidal particles including a platinum dioxide, a platinum monoxide, and a platinum hydroxide exist is generated. In a platinum oxide colloidal solution, the content of impurities is little and a noble metal compound is dispersed stably in water.
    Type: Application
    Filed: November 19, 2013
    Publication date: May 22, 2014
    Applicant: Hitachi-GE Nuclear Energy Ltd.
    Inventors: Kazushige ISHIDA, Masahiko TACHIBANA, Yoichi WADA, Nobuyuki OTA
  • Publication number: 20140069810
    Abstract: An electrochemical corrosion potential sensor has a sensor unit, a lead wire and a quasi-reference electrode. A sensor unit includes a tube-shaped insulator, a tube-shaped metal casing joined to an end portion of the insulator, and a Pt electrode joined to another end portion of the insulator. A lead wire connected to the Pt electrode passes through the insulator and the metal casing. The quasi-reference electrode disposed in the metal casing is made of a less noble metal and electrically connected with the lead wire. Since an electrochemical corrosion potential sensor has the quasi-reference electrode, the measurement of the corrosion potential of a structural member of a nuclear power plant and an abnormality occurrence (water intrusion) can be accurately detected during the operation of a nuclear power plant.
    Type: Application
    Filed: April 10, 2013
    Publication date: March 13, 2014
    Applicant: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masahiko TACHIBANA, Kazushige ISHIDA, Yoichi WADA, Nobuyuki OTA, Ryosuke SHIMIZU
  • Publication number: 20140037037
    Abstract: A noble metal injection apparatus is connected to a piping of a nuclear plant at the time of stop of the nuclear plant before start of the nuclear plant. In chemical decontamination, oxidation decontamination agent decomposition, and reduction decontamination on an inner surface of the pipe system are executed. After reduction decontamination, a part of an oxalic acid included in a reduction decontamination solution is decomposed and platinum is injected into the reduction decontamination solution of pH 3.5 or higher. When the platinum concentration becomes a preset concentration, a reduction agent is injected and the reduction decontamination solution including the platinum and reduction agent is brought into contact with the inner surface of the piping. The platinum is deposited on the inner surface of the piping. The injection of the platinum and reduction agent is stopped and the platinum and reduction agent are decomposed.
    Type: Application
    Filed: November 16, 2012
    Publication date: February 6, 2014
    Applicant: HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Tsuyoshi ITO, Hideyuki HOSOKAWA, Makoto NAGASE, Yoichi WADA, Kazushige ISHIDA, Motohiro AIZAWA
  • Patent number: 8524056
    Abstract: An electrochemical corrosion potential sensor (ECP sensor) has an electrode cap, an electrode fixing body, a tubular insulator, a tubular metallic housing, and a conductive wire. Both ends of the tubular insulator are connected to the electrode fixing body and the tubular metallic housing respectively. A conductive wire passes through the tubular insulator and the tubular metallic housing, and is connected to an inner surface of the electrode fixing body. The electrode cap 11 disposed to cover an outer surface of the electrode fixing body. The ECP sensor with such a construction can lengthen the lifetime.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: September 3, 2013
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazushige Ishida, Yoichi Wada, Masahiko Tachibana, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa, Nobuyuki Ota