Patents Assigned to Hitachi - GE Nuclear Energy, Ltd.
  • Patent number: 10726959
    Abstract: When a power source is lost after an operation stop of a nuclear power plant, a first open/close valve is opened via a first battery at an early stage and steam in a reactor pressure vessel (RPV) is condensed in a suppression pool. The heat of the water in the suppression pool is transmitted to a cooling water pool located below inner space between first and second reactor containment vessels surrounding the RPV. A second open/close valve is opened via a second battery at the early stage and cooling water in a tank is injected into the RPV. After the early stage, a third open/close valve is opened via a third battery, and a cooling medium becomes steam by an evaporator in the RPV, the steam being condensed by a condenser disposed in the inner space to become a liquid of the cooling medium and is returned to the evaporator.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: July 28, 2020
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kenichi Katono, Masao Chaki, Kazuaki Kito
  • Patent number: 10706978
    Abstract: There is provided a core of a boiling water reactor that can be operated without loading a new fuel assembly at an operation cycle before decommissioning. The core of the boiling water reactor includes multiple fuel assemblies loaded in a square lattice shape. The multiple fuel assemblies are arranged in the core based on the number of residence cycles of fuel assemblies laterally adjacent and longitudinally adjacent to a fuel assembly having the shortest loading period in core cross section. The arrangement of fuel assemblies is also based on the number of residence cycles of fuel assemblies diagonally adjacent to the fuel assembly having the shortest loading period.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: July 7, 2020
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Michitaka Ono, Motoo Aoyama, Takeshi Mitsuyasu
  • 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: 10446279
    Abstract: To more reliably supply cooling water to a reactor pressure vessel and a reactor containment vessel using a back-up building if a severe accident should occur, a boiling water type nuclear power plant includes a nuclear reactor building including a reactor containment vessel, and an external building, which is installed independently outside the nuclear reactor building and which has an anti-hazard property. The external building has a power source and an operating panel independent of the nuclear reactor building. The boiling water type nuclear power plant includes a water injection pump installed inside the external building, an alternative water injection pipe performing water injection at least on a reactor pressure vessel or the reactor containment vessel in the nuclear reactor building from the water injection pump, and a valve connected to the alternative water injection pipe, making it possible to perform alternative water injection if a severe accident occurs.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: October 15, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Yuriko Onishi, Kazuhiro Yoshikawa, Takashi Sumikawa
  • Patent number: 10438707
    Abstract: An atomic power plant is provided including a primary containment vessel (PCV) 1, a reactor pressure vessel (RPV) 3, a main steam line 4, two steam safety relief valves (SRVs) 6, a pressure suppression pool (S/P) 8, an SRV exhaust pipe 9 which is connected to a quencher 10, a temperature measuring instrument 12 which measures a temperature inside the quencher 10, an SRV controller 13 which controls opening and closing of the SRVs 6. After a lapse of predetermined time from when the SRV 6 is opened, in a case where it is determined that a temperature detected by the temperature measuring instrument 12 is equal to or smaller than a predetermined threshold value, the SRV controller 13 causes the SRV 6 to which the temperature measuring instrument 12 detecting the temperature leads, to be closed and to be prohibited from being opened.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: October 8, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazuaki Kito, Takahisa Matsuzaki, Tomohiko Ikegawa
  • Patent number: 10309772
    Abstract: Chirp waves generated in a transmitting/receiving unit is supplied to ultrasonic sensors. Signals output from the ultrasonic sensors are supplied to the transmitting/receiving unit and summed in a signal processing/recording unit. The signal processing/recording unit performs mutual correlation processing between the summed signals and the chirp waves and calculates a peak generation time difference. Necessity of exchanging a pipe is determined by calculating and recording the thickness of a pipe from the calculated time difference and calculating a difference between thicknesses measured in the past and the present.
    Type: Grant
    Filed: November 23, 2016
    Date of Patent: June 4, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Sou Kitazawa, Naoyuki Kono, Shinobu Okido
  • Patent number: 10286501
    Abstract: The laser welding apparatus includes a welding head and a welding head scanning apparatus. A collimate lens installed on a head body of the welding head is arranged opposite to an end face of optical fibers. The welding head includes only the collimate lens as a lens and the length is shortened. A laser generated by a laser oscillator is introduced into the optical fiber, enters the collimate lens, and then is converted to a parallel beam by the collimate lens. The laser of a parallel beam is irradiated on a surface a welding portion of the welding object through a laser path and the surface of the welding portion is melted. Metallic powder is jetted from powder feed paths formed in a head body to the melted portion and build-up welding is performed on the surface of the welding portion.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: May 14, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Koichi Kurosawa, Shinya Ohmori, Ren Morinaka, Kazuhiro Nitta, Yoichi Mahara, Keigo Uchiyama
  • Patent number: 10260651
    Abstract: A butterfly valve includes a valve body-side valve seat section, a valve box-side valve seat section, and a valve movement mechanism. The valve movement mechanism includes a cam groove, a cam projection, and a reverse key. The valve movement mechanism moves the valve body in an extending direction of the flow passage along with rotation of the valve shaft between a blocking position and an open position. One of the valve body-side valve seat section and the valve box-side valve seat section is formed of a laminated material composed of alternatingly stacked plates made of metal and plates made of expanded graphite.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: April 16, 2019
    Assignees: Hitachi-GE Nuclear Energy, Ltd., Okano Valve Mfg. Co. Ltd.
    Inventors: Yoshiharu Kawahara, Yoshihisa Kiyotoki, Takayoshi Nakashima, Keisuke Sakemura, Yoshitomo Kanemura, Yukio Imoto
  • Patent number: 10242759
    Abstract: A control rod drive mechanism includes an outer tube and a guide tube which is arranged in the outer tube and is held by the outer tube. Furthermore, the control rod drive mechanism includes a spool piece with an inner magnet coupling and a rotary shaft connected to the inner magnet coupling arranged internally. The lower end portion of the outer tube is supported by the spool piece in the spool piece. The outside diameter of the outer tube, through the length of the outer tube, is smaller than the inside diameter of the spool piece and the outer tube, in the radial direction of the outer tube, is not projected outside the inner surface of the spool piece. Therefore, the installation places of the O-rings which are a seal member are reduced and the time required for maintenance of the control rod drive mechanism can be shortened.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: March 26, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Takahiro Tsuchiya, Toshihiro Kodama, Hirokazu Akatsuka
  • Patent number: 10200577
    Abstract: Since an investigation apparatus is connected through a cable and is remotely operated, the cable may be caught by an obstacle, thereby limiting a movement range of the investigation apparatus. An investigation system 15 includes an investigation apparatus 50 which moves to a position where an investigation target is investigated, by using a traveling section 51 and a support apparatus 30 which moves to a position where letting-off and winding of a cable 14 for an investigation apparatus which is connected to the investigation apparatus 50 are performed, by using a traveling section 31. The investigation apparatus 50 outputs an image of the investigation target which is captured by a camera section 53, to an investigation apparatus controller 40 via the cable 14 for an investigation apparatus.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: February 5, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Satoshi Okada, Ryousuke Kobayashi, Kouji Ishizawa, Takanori Satou, Yoshinori Takahashi
  • Patent number: 10132779
    Abstract: To realize an object of providing an eddy current inspection device which is able to control a sensitivity decrease, and is able to reliably detect a defect.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: November 20, 2018
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masahiro Miki, Soushi Narishige, Isao Yoshida
  • 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
  • Patent number: 10020079
    Abstract: A core of a light water reactor has a plurality of fuel assemblies. The fuel assemblies include a plurality of fuel rods in which a lower end is supported by a lower tie-plate and an upper end is supported by an upper tie-plate. The fuel rods form plenums above a nuclear fuel material zone and have a neutron absorbing material filling zone under the nuclear fuel material zone. Neutron absorbing members attached to the upper tie-plate are disposed between mutual plenums of the neighboring fuel rods above the nuclear fuel material zone. The neutron absorbing members have a length of 500 mm and are positioned at a distance of 300 mm from the nuclear fuel material zone. Even if the overall core is assumed to become a state of 100% void, no positive reactivity is inserted to the core.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: July 10, 2018
    Assignee: HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Renzo Takeda, Junichi Miwa, Kumiaki Moriya
  • Patent number: 9933211
    Abstract: Provided is a plate heat exchanger that includes a plurality of heat transfer plates stacked to each other, a gasket interposed between each adjacent heat transfer plates, and a regulating member formed to be able to support at least partially the gasket. Each heat transfer plate has a fitting recessed portion formed in recessed manner on the side on which the gasket fitting groove is formed. The fitting recessed portion crosses the recessed strip while extending along the gasket fitting groove. The support part is arranged along the gasket fitting groove when the regulating member is held in fitting engagement with the fitting recessed portion. The support part is arranged along the gasket fitting groove when the regulating member is held in fitting engagement with the fitting recessed portion.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: April 3, 2018
    Assignees: HISAKA WORKS, LTD., Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Isamu Hiwatashi, Mana Iwaki, Seiichi Matsumura, Kiyoshi Ishihama
  • Patent number: 9927186
    Abstract: To provide a plate heat exchanger free from degradation of gaskets which form a flow path through which a high-temperature fluid flows. In the plate heat exchanger, a plurality of heat transfer plates 20 each provided with passage holes 21, 22, 23, and 24 in corners are stacked; a flow-path forming gasket 31 is interposed between peripheries of each adjacent ones of the heat transfer plates 20; communicating-path forming gaskets 32 are installed, surrounding the passage holes 21 in each adjacent ones of the heat transfer plates 20 alternately; and thereby a first flow path 1 adapted to pass a high-temperature fluid H, a second flow path adapted to pass a low-temperature fluid C, and communicating paths 3 adapted to cause the high-temperature fluid H and the low-temperature fluid C, respectively, to flow in and out of the first flow path 1 and the second flow path 2 are formed alternately on opposite sides of each of the heat transfer plates 20.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: March 27, 2018
    Assignees: Hisaka Works, Ltd., Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Isamu Hiwatashi, Mana Iwaki, Kenji Kusunoki, Seiichi Matsumura, Kiyoshi Ishihama, Funabiki Takahisa
  • Patent number: 9916908
    Abstract: A gas supply apparatus of the present invention includes a gas discharge line of a first electromagnetic valve having s a switching valve placed therein, and a second electromagnetic valve placed between the switching valve and a gas supply source. The switching valve switches between a gas discharge from the first electromagnetic valve and a gas supply to the first electromagnetic valve. At the time of a normal operation, the second electromagnetic valve opens a gas discharge line side and closes a switching valve side, and when the power source is lost, the second electromagnetic valve opens the switching valve side and closes the gas discharge line side. In this way, even when the power source is lost, an operating valve can not only be operated remotely but also be operated safely by a remote operator.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: March 13, 2018
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Ryo Kubota, Kenji Onodera, Yoshihisa Kiyotoki
  • Patent number: 9822859
    Abstract: A control rod drive mechanism includes an outer tube, a guide tube disposed inside the outer tube, a ball tube, a hollow piston, and an electric motor. A gap between a ball traveling side of the screw shaft and the traveling balls and a gap between the traveling balls and a ball traveling side of the ball nut, having the gap coefficient (A) is given by: A=((2×R?L)?D)÷(2×R?L). The diameter of the traveling balls is determined to satisfy the expression given by A, in which A has the value of more than 0.03 and less than 0.17.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: November 21, 2017
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Yuuichi Matsushita, Toshihiro Kodama, Kiyoshi Harada, Hirokazu Akatsuka, Takahiro Tsuchiya
  • Patent number: 9799418
    Abstract: Provided is a method of treating radioactive liquid waste which reduces the amount of radioactive waste to be generated and is capable of removing a radioactive nuclide from radioactive liquid waste to the extent that the concentration thereof is less than or equal to the measurement lower limit using a simple apparatus configuration. A filtration device is connected to a colloid removal device by a connection pipe. An adsorption tower positioned at the highest stream of an adsorption device is connected to the colloid removal device by a connection pipe. The colloid removal device includes an electrostatic filter. Respective adsorption towers in the adsorption device are sequentially connected by a pipe. A discharge pipe is connected to the adsorption tower positioned at the lowest stream of the adsorption device. Radioactive liquid waste, containing particles having a particle diameter of 1 ?m or greater, negatively charged colloids, and a radioactive nuclide, is supplied to the filtration device.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: October 24, 2017
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Yuuko Kani, Takashi Asano, Yusuke Kitamoto, Noriaki Takeshi, Kenji Noshita, Mamoru Kamoshida
  • Patent number: 9772146
    Abstract: A flow-path forming gasket is interposed between peripheries of each adjacent ones of stacked heat transfer plates; communicating-path forming gaskets are each installed, surrounding the passage holes in each adjacent ones of the heat transfer plates alternately; and thereby a first flow path adapted to pass a high-temperature fluid, a second flow path adapted to pass a low-temperature fluid, and communicating paths adapted to cause the fluids, respectively, to flow in and out of the first and second flow paths are formed alternately on opposite sides of each heat transfer plate. A drain hole is formed in each of the heat transfer plates to discharge fluid leaking from the first flow path, the second flow path, or the communicating path. The drain hole is surrounded by gaskets isolated from the first flow path, the second flow path, or the communicating path. A leakage flow path or a leakage collector is formed by the gaskets.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: September 26, 2017
    Assignees: HISAKA WORKS, LTD., Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Isamu Hiwatashi, Mana Iwaki, Kenji Kusunoki, Kiyoshi Ishihama, Seiichi Matsumura, Yukiko Kushima