Patents Assigned to Hitachi - GE Nuclear Energy, Ltd.
  • Publication number: 20150228362
    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: Application
    Filed: April 24, 2015
    Publication date: August 13, 2015
    Applicant: HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Renzo Takeda, Junichi Miwa, Kumiaki Moriya
  • Patent number: 9085811
    Abstract: A method for improving a residual stress in a pipe includes improving the residual stress in the inner surface to the compressive direction by rapid cooling of the inner surface after heating of the pipe. The heating is to heat a vicinity of a welded part of the pipe from the outer surface to raise the temperature to a construction temperature. The rapid cooling is to rapidly cool the inner surface in the vicinity of the welded part by supplying cooling water into the pipe. The heating and the rapid cooling are repeated twice or more. A method for construction management includes determining whether construction has been executed properly based on a maximum value of a lowering rate of an outer surface temperature of the pipe when the cooling water is supplied for the rapid cooling of the inner surface and a thickness of the pipe in a measuring position of the outer surface temperature.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: July 21, 2015
    Assignee: HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Shinobu Okido, Naohiko Oritani, Yuka Fukuda, Satoru Aoike, Masaki Tsuruki, Satoshi Kanno
  • Patent number: 9082518
    Abstract: Vibration of a jet pump installed in a reactor pressure vessel of a boiling water reactor is monitored. Ultrasonic waves are transmitted from an ultrasonic sensor installed on an outer surface of the reactor pressure vessel toward a throat and a diffuser of the jet pump. When the ultrasonic waves reach respective outer surfaces of the throat and diffuser, reflected waves are generated at the respective outer surfaces. The ultrasonic sensor receives those reflected waves. The ultrasonic signal process section obtains a distance in the horizontal direction between the throat and the diffuser based on a time difference of the reflected waves reflected from respective reflection surfaces of the throat and diffuser and a sound speed in reactor water in the neighborhood of the throat and diffuser. A relative vibration is obtained based on the change with time of the distance.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: July 14, 2015
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masahiro Hiratsuka, Atsushi Baba, Masahiro Koike, Taro Ikezumi, Minoru Ootaka
  • Patent number: 9067303
    Abstract: A chamber having a water jet generation apparatus and a mesh installed inside is pushed against a surface of a peening object. A rotary vane of the water jet generation apparatus, disposed in a region in the chamber between the mesh and the chamber, is rotated to generate a water jet flowing toward the peening object in one region in the chamber, the one region is a region closer to the peening object than the mesh. A plurality of shots 4 put in the region 30A moves toward the peening object along with the water jet and collides with the surface of the peening object. After the collision, the shots move toward the mesh along with the water jet. Compression residual stress is given to the surface of the peening object with which the shots have collided. Thus, spreading of contaminants peeled off from a peening object can be prevented.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: June 30, 2015
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Hisamitu Hatou, Noboru Saito, Ren Morinaka, Fujio Yoshikubo, Masashi Fukaya, Yuji Matsui, Ryuji Kimura
  • Patent number: 9047994
    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: December 23, 2010
    Date of Patent: June 2, 2015
    Assignee: HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Renzo Takeda, Junichi Miwa, Kumiaki Moriya
  • Patent number: 8995602
    Abstract: A jet pump beam (hereinafter, referred to as a beam) is fitted into a pair of projecting portions installed to a transition piece, and after the beam is arched, a beam bolt engaged with the beam is tightened. An end of the beam bolt comes in contact with a top surface of an insert member fitted into an elbow disposed between the pair of projecting portions. An ultrasonic sensor head is fixed to the beam bolt, and ultrasonic waves are sent to the beam bolt from the ultrasonic sensor in the ultrasonic sensor head. An ultrasonic measuring apparatus obtains echo intensity of each of reflected waves generated at the end of the beam bolt and a bottom surface of the insert member, and based on the echo intensities, an echo intensity ratio R is calculated. The installed state of the beam is checked using the echo intensity ratio R.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: March 31, 2015
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Atsushi Baba, Yoshinori Musha, Masahiro Hiratsuka, Minoru Ootaka, Masahiro Koike
  • Patent number: 8971475
    Abstract: A plant with piping mounted on branch pipe, wherein said piping which introduces gas has a nozzle portion as a joint portion to a vessel and a branch portion connected with a branch pipe; and wherein an enlarged passage portion is formed at least at one of said branch portion and said nozzle portion, and a passage sectional area of said enlarged passage portion is larger than that of said piping other than said enlarged passage portion. Since the flow velocity of the gas flowing inside slows down at the enlarged passage portion, the occurrence of acoustic resonance at the branch portion or the nozzle portion can be suppressed. Accordingly, the fluctuation pressure of the gas flowing in the piping can be reduced even more.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: March 3, 2015
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Keita Okuyama, Shiro Takahashi, Masami Kato, Akitaka Hidaka
  • Patent number: 8915161
    Abstract: A fine motion control rod drive mechanism handling apparatus attaches a fine motion control rod drive mechanism having a control rod drive mechanism body, a spool piece, a motor bracket and a motor unit to a reactor pressure vessel, and detaches it from the reactor pressure vessel. The fine motion control rod drive mechanism handling apparatus is provided with a bolt wrench assembly, a motor unit attachment mounted to the bolt wrench assembly, for meshing a first gear of a first gear coupling on a spool piece side with a second gear of a second gear coupling on a motor unit side, and a rotation mechanism mounted to the bolt wrench assembly, for rotating the motor unit attachment.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: December 23, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Hirokazu Akatsuka, Toshihiro Kodama, Takeaki Suzuki
  • Publication number: 20140367075
    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: Application
    Filed: September 13, 2012
    Publication date: December 18, 2014
    Applicants: Hitachi-GE Nuclear Energy, Ltd., HISAKA WORKS., LTD.
    Inventors: Isamu Hiwatashi, Mana Iwaki, Kenji Kusunoki, Seiichi Matsumura, Kiyoshi Ishihama, Funabiki Takahisa
  • Publication number: 20140355378
    Abstract: A single-element ultrasonic sensor includes a single transducer element and transmits an ultrasonic wave on the basis of a pulse wave. An ultrasonic array sensor includes a plurality of transducer elements and receives an ultrasonic reflected wave. A pulsar supplies the pulse wave to the single element ultrasonic sensor. A receiver receives electric signals from the transducer elements included in the ultrasonic array sensor. An amplification and conversion unit amplifies the electric signals received from the transducer elements included in the ultrasonic array sensor, converts the electric signals into digital signals, and arranges the digital signals in a serial order so as to generate a serial digital signal. An image generator generates an image on the basis of the serial digital signal.
    Type: Application
    Filed: June 2, 2014
    Publication date: December 4, 2014
    Applicant: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Naoyuki KONO, Kouichi KUROSAWA, So KITAZAWA, Yuji MATSUI
  • Patent number: 8903036
    Abstract: A nozzle apparatus of a jet pump includes a nozzle base member, and a plurality of nozzles installed to the nozzle base member and forming a plurality of narrowing portions, in which a fluid passage cross-sectional area of a driving fluid passage formed in the nozzle is reduced.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: December 2, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Naoyuki Ishida, Hisamichi Inoue
  • Publication number: 20140338870
    Abstract: Heat transfer plates are stacked, each being provided with a plurality of passage holes, a flow-path forming gasket is interposed between peripheries of each adjacent ones of the heat transfer plates, thereby alternately forming a first flow path to pass a high-temperature fluid, a second fluid to pass a low-temperature fluid, and communicating paths to cause the fluids to flow in and out of the first flow path and the second flow path on opposite sides of each heat transfer plate, and communicating-path forming gaskets surrounding the passage holes are interposed between adjacent ones of the heat transfer plates, thereby forming a communicating path to cause a fluid to flow in and out of the first flow path and a communicating path to cause a fluid to flow in and out the second flow path.
    Type: Application
    Filed: October 23, 2012
    Publication date: November 20, 2014
    Applicants: HISAKA WORKS, LTD., Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Isamu Hiwatashi, Mana Iwaki, Kenji Kusunoki, Kiyoshi Ishihama, Seiichi Matsumura, Takahisa Funabiki
  • Patent number: 8888069
    Abstract: The invention provides a valve which suppresses a continuous corrosion of a chemical compound phase such as an eutectic carbide or the like in a valve seat, and improves a corrosion resistance, an impact resistance and an erosion resistance of the valve seat. The invention disperses a chemical compound phase such as the eutectic carbide or the like crystallizing in a dendrite gap as a granular shape or a blocky shape which is equal to or less than about 100 ?m, by moving a tool rotating in a crimped state by a load application to a vertical direction to a surface of the valve seat so as to carry out a friction stir processing, and forming a weld metallographic structure of a surface layer portion of the valve seat as a cubic.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: November 18, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Yusaku Maruno, Seunghwan Park, Yoshihisa Kiyotoki, Shin Kumagai
  • Publication number: 20140331771
    Abstract: Disclosed is an ultrasonic measurement system that even without additional means for temperature measurement, compensates for a change in a sound speed of an ultrasonic wave in a section whose thickness is to be measured, and assesses a wall thinning state of this section by highly accurate measurement of the thickness. An ultrasonic transducer 101 includes a piezoelectric element 108. A high-temperature MI cable 102 contains strands 110A, 110B connected to the ultrasonic transducer 101, and further includes a metallic sheath 112. A temperature sensor is contained in the high-temperature MI cable 102, and includes a thermocouple section 114 to which the strands 110A, 110B are connected at one end of each strand. An ultrasonic transmitter/receiver 117 makes the ultrasonic transducer to transmit ultrasonic waves and to receive the waves reflected from the object whose thickness is to be measured.
    Type: Application
    Filed: November 15, 2013
    Publication date: November 13, 2014
    Applicant: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Atsushi BABA, Yoshinori MUSHA, Atsushi FUSHIMI
  • Patent number: 8842797
    Abstract: A gamma scanning apparatus includes a moving and fixing mechanism which moves/fixes a housing to a definite position, and a rotating and moving mechanism which moves a fuel assembly vertically in addition to rotating the assembly. A gamma-ray counting circuit measures an output of a gamma-ray detector, and a data collecting/analyzing and controlling apparatus analyzes data output from the gamma-ray counting circuit, in association with data relating to the rotation and movement of the fuel assembly by the rotating and moving mechanism. The rotating and moving mechanism, after fixing the vertical position of the fuel assembly with the housing also fixed, rotates the fuel assembly through 360° with its height kept constant, and during the 360° rotation of the fuel assembly, the gamma-ray counting circuit measures either a time average of count values of the detector during the rotation or an integral value within a fixed time.
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: September 23, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Takahiro Tadokoro, Hiroshi Kitaguchi, Katsunori Ueno, Yutaka Iwata, Ryusuke Kimura
  • Patent number: 8842795
    Abstract: A control rod grasped by a hook of a grasping equipment is moved down and is positioned at an upper end of a hollow piston of a control rod drive mechanism (CRD) in a state that the control rod is fully withdrawn from a core. Furthermore, the hook is inserted into an opening of a handle of the control rod. The hook is lifted up so as to make contact with the handle. The control rod grasped by the grasping equipment is rotated by a grasping equipment rotation apparatus. A state that gaps formed between joint convexities in a coupling socket of the control rod are positioned right above coupling spud convexities of the hollow piston occurs. At this time, the control rod falls by its own weight and the coupling spud convexities pass through the gaps. A grasping equipment movement apparatus suppresses the falling speed of the control rod. The control rod is rotated at 90° and the control rod and CRD are connected.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: September 23, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Hirokazu Akatsuka, Toshihiro Kodama
  • Publication number: 20140254738
    Abstract: The present invention is directed to remote operation of an operation valve such as an air operated valve even at the time of power loss. A gas supply apparatus of the present invention includes: an operation valve mounted in some midpoint of a piping for passing at least gas in a plant and operating a valve body by the gas flowing in the piping; an solenoid valve mounted in some midpoint of the piping and allowing/stopping flow of the gas to the operation valve; and a gas supply source for supplying gas to the solenoid valve. A switching valve for switching between exhaust from the solenoid valve and gas supply to the solenoid valve is mounted in an exhaust line of the solenoid valve and, at the time of power loss, the switching valve is switched to connection to the gas supply source for supplying gas to the solenoid valve.
    Type: Application
    Filed: February 19, 2014
    Publication date: September 11, 2014
    Applicant: HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Ryo KUBOTA, Kenji ONODERA, Yoshihisa KIYOTOKI
  • Patent number: 8821973
    Abstract: Both ends of a circulation pipe of a film formation apparatus are connected to a piping of a BWR plant. A chemical including chromium ions and formic acid is injected into a film formation solution flowing in the circulation pipe heated to a temperature within a range from 60° C. to 100° C. Furthermore, a chemical including iron (II) ions and formic acid, hydrogen peroxide, and hydrazine are injected into the circulation pipe. Due to the injection of these chemicals, a film formation solution of pH 7.0 including iron (II) ions, chromium ions, formic acid, hydrogen peroxide, and hydrazine is generated in the circulation pipe. This film formation solution includes hydrazine of, for example, 1000 ppm. The film formation solution is supplied to the piping, thus, a Fe3—xCrxO4 film (here, 0<X?0.1) is formed on the inner surface of the piping. The above method of forming the ferrite film on a structural member (for example, the piping) can be shortened time required to form the ferrite film.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: September 2, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Tsuyoshi Ito, Hideyuki Hosokawa, Yukio Hirama, Makoto Nagase
  • Patent number: 8820163
    Abstract: A nondestructive inspection apparatus includes a pair of guided wave sensors disposed on an outer surface of a piping and a guided wave inspection device connected to the pair of guided wave sensors which, outputs a transmitting signal for propagating a guided wave to the guided wave sensors, and obtains a receiving signal by receiving a propagated signal by the guided wave sensors. An inspection-result storage device stores the guided wave as a digitized signal of the received wave and an inspection-result diagnostic device performs arithmetic processing of judging whether or not a signal associated with a defect exists.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: September 2, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masahiro Miki, Yoshiaki Nagashima, Masao Endou, Kojiro Kodaira, Mitsuru Odakura
  • Publication number: 20140233689
    Abstract: In a water jet peening apparatus, a high-pressure under-water pump is installed on an upper end of a casing and an injection nozzle drive mechanism equipped with an injection nozzle is attached to the casing. A high-pressure hose whose one end is connected to the high-pressure under-water pump is disposed in the casing and the other end of the high-pressure hose is connected to the injection nozzle. The casing is seated at an upper end of a control rod drive mechanism housing and the high-pressure under-water pump is driven. The high-pressure water pressurized by the high-pressure under-water pump is supplied to the injection nozzle through the high-pressure hose in the casing and is jetted toward the weld portion between the control rod drive mechanism housing and a stub tube. The time required for a water jet peening operation can be shortened.
    Type: Application
    Filed: February 14, 2014
    Publication date: August 21, 2014
    Applicant: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Noboru SAITO, Hisamitsu HATOU, Koichi KUROSAWA, Fujio YOSHIKUBO, Ren MORINAKA, Ryuji KIMURA