Patents by Inventor Kouji Shiina

Kouji Shiina 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: 8514998
    Abstract: In implementing an induction heating stress improvement (IHSI) method in a nuclear plant, cooling characteristic with respect to the inner surface of piping is improved by appropriate structure/layout of nozzles, and further, the cooling effect when applying IHSI to a real machine is verified by installing a thermometer, as well as air in the portion subjected to IHSI is removed by heating the piping prior to the execution of IHSI.
    Type: Grant
    Filed: December 30, 2005
    Date of Patent: August 20, 2013
    Assignee: Hitachi-Ge Nuclear Energy, Ltd.
    Inventors: Shiro Takahashi, Kouji Shiina, Shoji Hayashi, Hideyo Saito, Minoru Masuda, Satoshi Kanno, Kenichi Nihei, Hiroaki Asakura
  • Patent number: 8453451
    Abstract: In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: June 4, 2013
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masao Chaki, Kazuaki Kitou, Motoo Aoyama, Masaya Ootsuka, Kouji Shiina
  • Patent number: 8291704
    Abstract: In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: October 23, 2012
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masao Chaki, Kazuaki Kitou, Motoo Aoyama, Masaya Ootsuka, Kouji Shiina
  • Patent number: 7997078
    Abstract: In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: August 16, 2011
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masao Chaki, Kazuaki Kitou, Motoo Aoyama, Masaya Ootsuka, Kouji Shiina
  • Publication number: 20110162364
    Abstract: In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle.
    Type: Application
    Filed: March 11, 2011
    Publication date: July 7, 2011
    Inventors: Masao Chaki, Kazuaki Kitou, Motoo Aoyama, Masaya Ootsuka, Kouji Shiina
  • Publication number: 20110162363
    Abstract: In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle.
    Type: Application
    Filed: March 11, 2011
    Publication date: July 7, 2011
    Inventors: Masao CHAKI, Kazuaki KITOU, Motoo AOYAMA, Masaya OOTSUKA, Kouji SHIINA
  • Patent number: 7970094
    Abstract: A nuclear power plant and method of operation for augmenting a second reactor thermal power output in a second operation cycle to a level larger than a first reactor thermal power output in the previous operation cycle. The plant is equipped, for example, with a reactor; a steam loop comprising high and low pressure turbines; a condenser for condensing steam discharged therefrom the low pressure turbine; a feedwater heater for heating feedwater supplied from the condenser; and a feedwater loop for leading feedwater discharged from the feedwater heater to the reactor. The operation method includes decreasing a ratio of extraction steam which is led to the feedwater heater from a steam loop in the second operation cycle.
    Type: Grant
    Filed: January 2, 2008
    Date of Patent: June 28, 2011
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazuaki Kitou, Masao Chaki, Kouji Shiina, Motoo Aoyama, Masaya Ohtsuka, Masayuki Nagasawa, Minoru Okura, Seiji Nemoto, Yasuhiro Takahashi
  • Publication number: 20100170246
    Abstract: In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle.
    Type: Application
    Filed: October 6, 2009
    Publication date: July 8, 2010
    Inventors: Masao CHAKI, Kazuaki Kitou, Motoo Aoyama, Masaya Ootsuka, Kouji Shiina
  • Patent number: 7614233
    Abstract: In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: November 10, 2009
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Masao Chaki, Kazuaki Kitou, Motoo Aoyama, Masaya Ootsuka, Kouji Shiina
  • Publication number: 20080181349
    Abstract: A nuclear power plant and method of operation for augmenting a second reactor thermal power output in a second operation cycle to a level larger than a first reactor thermal power output in the previous operation cycle. The plant is equipped, for example, with a reactor; a steam loop comprising high and low pressure turbines; a condenser for condensing steam discharged therefrom the low pressure turbine; a feedwater heater for heating feedwater supplied from the condenser; and a feedwater loop for leading feedwater discharged from the feedwater heater to the reactor. The operation method includes decreasing a ratio of extraction steam which is led to the feedwater heater from a steam loop in the second operation cycle.
    Type: Application
    Filed: January 2, 2008
    Publication date: July 31, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Kazuaki Kitou, Masao Chaki, Kouji Shiina, Motoo Aoyama, Masaya Ohtsuka, Masayuki Nagasawa, Minoru Okura, Seiji Nemoto, Yasuhiro Takahashi
  • Publication number: 20070000250
    Abstract: A nuclear power plant and an operation method of the nuclear power plant, which can uprate plant power without greatly modifying the construction of plant equipment, while keeping a core's pressure loss characteristic, a safety margin, and a design margin in the transient state substantially the same as those before the power uprate. Thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam is reduced in the second operation cycle from that in the first operation cycle such that temperature of feedwater discharged from the feedwater heater lowers in the range of 1° C. to 40° C. in the second operation cycle.
    Type: Application
    Filed: January 27, 2006
    Publication date: January 4, 2007
    Inventors: Masao Chaki, Kazuaki Kitou, Motoo Aoyama, Masaya Ootsuka, Kouji Shiina
  • Publication number: 20060197638
    Abstract: In implementing an induction heating stress improvement (IHSI) method in a nuclear plant, cooling characteristic with respect to the inner surface of piping is improved by appropriate structure/layout of nozzles, and further, the cooling effect when applying IHSI to a real machine is verified by installing a thermometer, as well as air in the portion subjected to IHSI is removed by heating the piping prior to the execution of IHSI.
    Type: Application
    Filed: December 30, 2005
    Publication date: September 7, 2006
    Inventors: Shiro Takahashi, Kouji Shiina, Shoji Hayashi, Hideyo Saito, Minoru Masuda, Satoshi Kanno, Kenichi Nihei, Hiroaki Asakura