Patents by Inventor Garry C. Crabtree

Garry C. Crabtree 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: 7668284
    Abstract: A nuclear fuel assembly having a tube-in-tube control rod guide tube design that incorporates an end plug that extends axially upward to an elevation above the lower most grid where it is sealed at its upper end to the lower end of the control rod guide tube. The guide tube lower end plug has a threaded recess in its upper surface that mates with a corresponding dashpot end plug threaded extension that is formed as an insert in the lower end of the guide tube. A hole formed through the outer wall of the guide tube end plug at the elevation of the lower portion of the recess provides a positive inspection port for assuring the proper seating of the dashpot. A method of manufacture of such a fuel assembly is also disclosed.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: February 23, 2010
    Assignee: Westinghouse Electric Co. LLC
    Inventors: James A. Sparrow, Yuriy Aleshin, Garry C. Crabtree
  • Publication number: 20090252281
    Abstract: A nuclear fuel assembly having a tube-in-tube control rod guide tube design that incorporates an end plug that extends axially upward to an elevation above the lower most grid where it is sealed at its upper end to the lower end of the control rod guide tube. The guide tube lower end plug has a threaded recess in its upper surface that mates with a corresponding dashpot end plug threaded extension that is formed as an insert in the lower end of the guide tube. A hole formed through the outer wall of the guide tube end plug at the elevation of the lower portion of the recess provides a positive inspection port for assuring the proper seating of the dashpot. A method of manufacture of such a fuel assembly is also disclosed.
    Type: Application
    Filed: December 11, 2008
    Publication date: October 8, 2009
    Applicant: Westinghouse Electric Company, LLC
    Inventors: James A. Sparrow, Yuriy Aleshin, Garry C. Crabtree
  • Patent number: 7515674
    Abstract: A nuclear fuel assembly having a tube-in-tube control rod guide tube design that incorporates an end plug that extends axially upward to an elevation above the lower most grid where it is sealed at its tipper end to the lower end of the control rod guide tube. The guide tube lower end plug has a threaded recess in its upper surface that mates with a corresponding dashpot end plug threaded extension that is formed as an insert in the lower end of the guide tube. A hole formed through the outer wall of the guide tube end plug at the elevation of the lower portion of the recess provides a positive inspection port for assuring the proper seating of the dashpot. A method of manufacture of such a fuel assembly is also disclosed.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: April 7, 2009
    Assignee: Westinghouse Electric Co LLC
    Inventors: James A. Sparrow, Yuriy Aleshin, Garry C. Crabtree
  • Publication number: 20080137798
    Abstract: A nuclear fuel assembly having a tube-in-tube control rod guide tube design that incorporates an end plug that extends axially upward to an elevation above the lower most grid where it is sealed at its tipper end to the lower end of the control rod guide tube. The guide tube lower end plug has a threaded recess in its upper surface that mates with a corresponding dashpot end plug threaded extension that is formed as an insert in the lower end of the guide tube. A hole formed through the outer wall of the guide tube end plug at the elevation of the lower portion of the recess provides a positive inspection port for assuring the proper seating of the dashpot. A method of manufacture of such a fuel assembly is also disclosed.
    Type: Application
    Filed: October 18, 2006
    Publication date: June 12, 2008
    Applicant: Westinghouse Electric Company, LLC
    Inventors: James A. Sparrow, Yuriy Aleshin, Garry C. Crabtree
  • Patent number: 4935197
    Abstract: A nuclear reactor core sub-assembly is provided with a removable lifting head (12)/absorber pin (20) assembly. The absorber pins (20) are connected to the lifting head (12) in such a way that they can be disconnected, inverted and reconnected the other way round, either collectively as a unit or individually. This allows the same absorber pins to be used at least twice over in different sub-assemblies since only the absorber material closest to the core tends to become depleted during irradiation.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: June 19, 1990
    Assignee: British Nuclear Fuels Plc
    Inventors: John W. Gillespie, Garry C. Crabtree, Paul G. Giddins