Patents by Inventor Renzou Takeda

Renzou Takeda 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).

  • Boiling water reactor core and fuel assemblies therefor
    Patent number: 8363776
    Abstract: A ratio of the number of fuel assemblies loaded on a core to the number of control rod drive mechanisms is 3 or more. The fuel assembly itself contains mixed oxides of a low enrichment concentration uranium oxide containing 3 to 8 wt % in the average enrichment concentration of the fuel assembly, or mixed oxide containing not less than 2 wt %, but less than 6 wt % in the average enrichment concentration of fissile plutonium of. In the burner type BWR core on which the fuel assemblies are loaded, an average weight density of uranium, plutonium and minor actinides is 2.1 to 3.4 kg/L as a conversion at the value of unburned state.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: January 29, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Renzou Takeda, Motoo Aoyama, Junichi Miwa, Tomohiko Ikegawa, Kumiaki Moriya
  • BOILING WATER REACTOR CORE AND FUEL ASSEMBLIES THEREFOR
    Publication number: 20130003908
    Abstract: A ratio of the number of fuel assemblies loaded on a core to the number of control rod drive mechanisms is 3 or more. The fuel assembly itself contains mixed oxides of a low enrichment concentration uranium oxide containing 3 to 8 wt % in the average enrichment concentration of the fuel assembly, or mixed oxide containing not less than 2 wt %, but less than 6 wt % in the average enrichment concentration of fissile plutonium of. In the burner type BWR core on which the fuel assemblies are loaded, an average weight density of uranium, plutonium and minor actinides is 2.1 to 3.4 kg/L as a conversion at the value of unburned state.
    Type: Application
    Filed: March 19, 2004
    Publication date: January 3, 2013
    Inventors: Renzou Takeda, Motoo Aoyama, Junichi Miwa, Tomohiko Ikegawa, Kumiaki Moriya
  • Boiling water reactor core and fuel assemblies therefor
    Patent number: 7349518
    Abstract: A ratio of the number of fuel assemblies loaded on a core to the number of control rod drive mechanisms is 3 or more. The fuel assembly itself contains mixed oxides of a low enrichment concentration uranium oxide containing 3 to 8 wt % in the average enrichment concentration of the fuel assembly, or mixed oxide containing not less than 2 wt %, but less than 6 wt % in the average enrichment concentration of fissile plutonium of. In the burner type BWR core on which the fuel assemblies are loaded, an average weight density of uranium, plutonium and minor actinides is 2.1 to 3.4 kg/L as a conversion at the value of unburned state.
    Type: Grant
    Filed: March 16, 2006
    Date of Patent: March 25, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Renzou Takeda, Motoo Aoyama, Junichi Miwa, Tomohiko Ikegawa, Kumiaki Moriya
  • Boiling water reactor core and fuel assemblies therefor
    Publication number: 20060210009
    Abstract: A ratio of the number of fuel assemblies loaded on a core to the number of control rod drive mechanisms is 3 or more. The fuel assembly itself contains mixed oxides of a low enrichment concentration uranium oxide containing 3 to 8 wt % in the average enrichment concentration of the fuel assembly, or mixed oxide containing not less than 2 wt %, but less than 6 wt % in the average enrichment concentration of fissile plutonium of. In the burner type BWR core on which the fuel assemblies are loaded, an average weight density of uranium, plutonium and minor actinides is 2.1 to 3.4 kg/L as a conversion at the value of unburned state.
    Type: Application
    Filed: March 16, 2006
    Publication date: September 21, 2006
    Inventors: Renzou Takeda, Motoo Aoyama, Junichi Miwa, Tomohiko Ikegawa, Kumiaki Moriya