Patents by Inventor Kazuhiko Ishiii

Kazuhiko Ishiii 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).

  • Reactor power control apparatus of a natural circulation boiling water reactor and a feed water control apparatus and nuclear power generation plant
    Patent number: 7860206
    Abstract: In order to provide a reactor power control apparatus which can maintain a stable water level when reactivity control based on control rod operation and water level adjustment is performed, this invention comprises a turbine control which calculates the load set error signal from the error between the set target generator power value and the generator power that was fed back and outputs to the turbine control apparatus; control rod control in the natural circulation boiling water reactor which calculates the control rod operation signal and outputs it to the control rod drive control apparatus; water level control inside the natural circulation boiling water reactor which calculates the water level set signal and outputs it to the feed water control apparatus; and the switch determining device which selectively outputs one of the control rod control and water level control based on the generator power that was fed back, the reactor power and water level, as well as switching rules and determination values.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: December 28, 2010
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Atsushi Fushimi, Setsuo Arita, Kazuhiko Ishiii, Yoshihiko Ishii, Shin Hasegawa, Atsutoshi Mizuide