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).
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Patent number: 8774342Abstract: 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: GrantFiled: February 18, 2011Date of Patent: July 8, 2014Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Yuko Hino, Kazushige Ishida, Naoshi Usui
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Publication number: 20140140465Abstract: 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: ApplicationFiled: November 19, 2013Publication date: May 22, 2014Applicant: Hitachi-GE Nuclear Energy Ltd.Inventors: Kazushige ISHIDA, Masahiko TACHIBANA, Yoichi WADA, Nobuyuki OTA
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Publication number: 20140069810Abstract: 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: ApplicationFiled: April 10, 2013Publication date: March 13, 2014Applicant: Hitachi-GE Nuclear Energy, Ltd.Inventors: Masahiko TACHIBANA, Kazushige ISHIDA, Yoichi WADA, Nobuyuki OTA, Ryosuke SHIMIZU
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Publication number: 20140037037Abstract: 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: ApplicationFiled: November 16, 2012Publication date: February 6, 2014Applicant: HITACHI-GE NUCLEAR ENERGY, LTD.Inventors: Tsuyoshi ITO, Hideyuki HOSOKAWA, Makoto NAGASE, Yoichi WADA, Kazushige ISHIDA, Motohiro AIZAWA
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Patent number: 8524056Abstract: 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: GrantFiled: January 29, 2010Date of Patent: September 3, 2013Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Kazushige Ishida, Yoichi Wada, Masahiko Tachibana, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa, Nobuyuki Ota
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Patent number: 8457270Abstract: A method of suppressing deposition of radionuclides on components of a nuclear power plant comprises forming a ferrite film by contacting a first chemical including iron (II) ions, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.Type: GrantFiled: January 4, 2011Date of Patent: June 4, 2013Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hideyuki Hosokawa, Makoto Nagase, Kazushige Ishida, Yoichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
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Patent number: 8175211Abstract: The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.Type: GrantFiled: June 18, 2008Date of Patent: May 8, 2012Assignee: Hitachi-Ge Nuclear Energy, Ltd.Inventors: Kazushige Ishida, Yoichi Wada, Makoto Nagase, Masahiko Tachibana, Masao Endo, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa
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Publication number: 20110216872Abstract: 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: ApplicationFiled: February 18, 2011Publication date: September 8, 2011Applicant: Hitachi-GE Nuclear Energy, Ltd.Inventors: Yuko HINO, Kazushige Ishida, Naoshi Usui
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Publication number: 20110176649Abstract: A method of suppressing deposition of radionuclides on components of a nuclear power plant comprises forming a ferrite film by contacting a first chemical including iron (II) ions, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.Type: ApplicationFiled: January 4, 2011Publication date: July 21, 2011Applicant: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hideyuki HOSOKAWA, Makoto Nagase, Kazushige Ishida, Yoichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
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Patent number: 7907695Abstract: A natural circulation boiling water reactor provides to a chimney with a plurality of tubes. That is to say, each of the plurality of tubes partitions the coolant flow path above a core. Thus, unlike the conventional natural circulation boiling water reactor providing the flow path partition wall grid in which the plate members are made integral by welding and coolant flow paths are partitioned, the chimney of the natural circulation boiling water reactor can reduce the number of welded portions because the edges of the four corners of each flow path do not need to be welded. The natural circulation boiling water reactor can avoid removal as a single unit, as in the case of the flow path partition wall grid in the conventional natural circulation boiling water reactor, by detaching each tube. The chimney can be easily detached from the reactor pressure vessel.Type: GrantFiled: February 28, 2007Date of Patent: March 15, 2011Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Atsushi Watanabe, Yoichi Wada, Makoto Nagase, Kazushige Ishida, Hideyuki Hosokawa, Fumihito Hirokawa, Masaaki Tsubaki, Shiro Takahashi
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Patent number: 7889828Abstract: A method of suppressing deposition of radionuclides on components of a nuclear power plant comprises forming a ferrite film by contacting a first chemical including iron (II) ions, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.Type: GrantFiled: March 25, 2009Date of Patent: February 15, 2011Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hideyuki Hosokawa, Makoto Nagase, Kazushige Ishida, Yoichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
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Patent number: 7869557Abstract: The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.Type: GrantFiled: January 16, 2009Date of Patent: January 11, 2011Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Kazushige Ishida, Yoichi Wada, Makoto Nagase, Masahiko Tachibana, Masao Endo, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa
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Patent number: 7864914Abstract: The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.Type: GrantFiled: February 2, 2009Date of Patent: January 4, 2011Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Kazushige Ishida, Yoichi Wada, Makoto Nagase, Masahiko Tachibana, Masao Endo, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa
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Patent number: 7844024Abstract: A method of suppressing deposition of radionuclides on components of a nuclear power plant comprises forming a ferrite film by contacting a first chemical including iron (II) ions, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.Type: GrantFiled: February 3, 2009Date of Patent: November 30, 2010Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hideyuki Hosokawa, Makoto Nagase, Kazushige Ishida, Yoichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
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Patent number: 7811392Abstract: It is an object of the present invention to efficiently suppress radionuclide deposition on a reactor component of nuclear power plant. Radionuclide deposition on the surface of a metallic reactor component of nuclear power plant is suppressed by forming a ferrite film on the component, wherein the film is formed, after decontamination for removing radionuclides contaminants from the component surface is completed and before the plant is started up, by contacting a treatment solution which mixes a first agent containing the iron (II) ions, a second agent for oxidizing the iron (II) ions into the iron (III) ions and a third agent for adjusting pH level of a solution to 5.5 to 9.0 in this order with the reactor component surface.Type: GrantFiled: July 14, 2006Date of Patent: October 12, 2010Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hideyuki Hosokawa, Makoto Nagase, Kazushige Ishida, Youichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
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Publication number: 20100206729Abstract: 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: ApplicationFiled: January 29, 2010Publication date: August 19, 2010Applicant: HITACHI-GE NUCLEAR ENERGY, LTD.Inventors: Kazushige ISHIDA, Yoichi WADA, Masahiko TACHIBANA, Motomasa FUSE, Naoshi USUI, Motohiro AIZAWA, Nobuyuki OTA
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Patent number: 7769124Abstract: A handling method for a natural circulation boiling water reactor having a chimney having cylindrical chimney shell disposed above a core in a reactor pressure vessel, a plurality of square tubes disposed in the chimney shell, and a grid support plate with grid holes supporting and in communication with a lower end portion of the square tubes so that adjacent square tubes are disposed at an interval which exceeds the width of one square tube between them. The method includes steps shifting predetermined ones of the square tubes to the interval between the square tubes, and performing maintenance and inspection of members around a core via the grid holes which appear at positions from which the predetermined square tubes are taken out due to the shift of the predetermined square tubes.Type: GrantFiled: June 3, 2008Date of Patent: August 3, 2010Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Atsushi Watanabe, Yoichi Wada, Makoto Nagase, Kazushige Ishida, Hideyuki Hosokawa, Fumihito Hirokawa, Masaaki Tsubaki, Shiro Takahashi
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Publication number: 20090225928Abstract: The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.Type: ApplicationFiled: January 16, 2009Publication date: September 10, 2009Inventors: Kazushige ISHIDA, Yoichi Wada, Makoto Nagase, Masahiko Tachibana, Masao Endo, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa
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Publication number: 20090190712Abstract: The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.Type: ApplicationFiled: February 2, 2009Publication date: July 30, 2009Inventors: Kazushige ISHIDA, Yoichi Wada, Makoto Nagase, Masahiko Tachibana, Masao Endo, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa
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Publication number: 20090185653Abstract: A method of suppressing deposition of radionuclides on components of a nuclear power plant comprises forming a ferrite film by contacting a first chemical including iron (II) ions, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.Type: ApplicationFiled: March 25, 2009Publication date: July 23, 2009Applicant: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hideyuki HOSOKAWA, Makoto NAGASE, Kazushige ISHIDA, Yoichi WADA, Naoshi USUI, Motohiro AIZAWA, Motomasa FUSE