Patents by Inventor Ishi Mitsuhashi

Ishi Mitsuhashi 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: 8401141
    Abstract: A first intensity Az expressed as Az=az×E?, a first reference intensity A0 expressed as A0=a0×E?, a second intensity Bz expressed as Bz=bz×E, and a second reference intensity B0=b0×E, are evaluated. The first intensity and the first reference intensity are of radioactive nuclides generated by a neutron capture reaction of a heavy nuclide or a fission product nuclide. The second intensity and the second reference intensity are of radioactive fission product nuclides except nuclides generated by a neutron capture reaction. The reference intensities are measured where the void fraction is known. Also a correlation curve of (az/a0) and a void fraction is evaluated. Finally an axial void fraction distribution is evaluated based on the value of (az/a0) and the correlation curve.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: March 19, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Makoto Ueda, Hironori Kumanomido, Ishi Mitsuhashi, Tsukasa Kikuchi, Kenichi Yoshioka, Tomoharu Sasaki, Kouji Hiraiwa
  • Patent number: 8130896
    Abstract: A method of controlling the criticality of a nuclear fuel cycle facility includes steps of producing a reactor fuel by adding less than 0.1% by weight of gadolinia to a uranium dioxide powder with a uranium enrichment of greater than 5% by weight and controlling the effective neutron multiplication factor of a uranium dioxide system in a step of handling the reactor fuel to be less than or equal to the maximum of the effective neutron multiplication factor of a uranium dioxide system with a uranium enrichment of 5% by weight.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: March 6, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shoichi Watanabe, Ishi Mitsuhashi, Kenichi Yoshioka
  • Publication number: 20110080987
    Abstract: Among fuel rods constituting a fuel assembly, Gd compound oxide is added to low Gd containing fuel rods that containing uranium dioxide of which enrichment exceeds 5 wt %. The Gd compound oxide is oxide of gadolinium and rare earth element A except for gadolinium and is expressed as a chemical formula A1-xGdxO2-0.5x or a chemical formula A1-xGdxO1.5. As the rare earth element A, cerium Ce, lanthanum La or erbium Er can be used.
    Type: Application
    Filed: October 14, 2010
    Publication date: April 7, 2011
    Inventors: Souichi WATANABE, Hironori Kumanomido, Ishi Mitsuhashi, Satoshi Sugahara, Makoto Ueda
  • Publication number: 20090252271
    Abstract: A first intensity Az expressed as Az=az×E?, a first reference intensity A0 expressed as A0=a0×E?, a second intensity Bz expressed as Bz=bz×E, and a second reference intensity B0=b0×E, are evaluated. The first intensity and the first reference intensity are of radioactive nuclides generated by a neutron capture reaction of a heavy nuclide or a fission product nuclide. The second intensity and the second reference intensity are of radioactive fission product nuclides except nuclides generated by a neutron capture reaction. The reference intensities are measured where the void fraction is known. Also a correlation curve of (az/a0) and a void fraction is evaluated. Finally an axial void fraction distribution is evaluated based on the value of (az/a0) and the correlation curve.
    Type: Application
    Filed: December 29, 2008
    Publication date: October 8, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Ueda, Hironori Kumanomido, Ishi Mitsuhashi, Tsukasa Kikuchi, Kenichi Yoshioka, Tomoharu Sasaki, Kouji Hiraiwa
  • Publication number: 20090028284
    Abstract: A method of controlling the criticality of a nuclear fuel cycle facility includes steps of producing a reactor fuel by adding less than 0.1% by weight of gadolinia to a uranium dioxide powder with a uranium enrichment of greater than 5% by weight and controlling the effective neutron multiplication factor of a uranium dioxide system in a step of handling the reactor fuel to be less than or equal to the maximum of the effective neutron multiplication factor of a uranium dioxide system with a uranium enrichment of 5% by weight.
    Type: Application
    Filed: May 14, 2008
    Publication date: January 29, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shoichi Watanabe, Ishi Mitsuhashi, Kenichi Yoshioka
  • Publication number: 20070076839
    Abstract: A first intensity Az expressed as Az=az×E?, a first reference intensity Ao expressed as Ao=ao×E?, a second intensity Bz expressed as Bz=bz×E, and a second reference intensity Bo=bo×E, are evaluated. The first intensity and the first reference intensity are of radioactive nuclides generated by a neutron capture reaction of a heavy nuclide or a fission product nuclide. The second intensity and the second reference intensity are of radioactive fission product nuclides except nuclides generated by a neutron capture reaction. The reference intensities are measured where the void fraction is known. Also a correlation curve of (az/ao) and a void fraction is evaluated. Finally an axial void fraction distribution is evaluated based on the value of (az/ao) and the correlation curve.
    Type: Application
    Filed: May 16, 2006
    Publication date: April 5, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Ueda, Hironori Kumanomido, Ishi Mitsuhashi, Tsukasa Kikuchi, Kenichi Yoshioka, Tomoharu Sasaki, Kouji Hiraiwa