Patents by Inventor Bernard Grattier

Bernard Grattier 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).

  • Lower end nozzle of a fuel assembly having a particle retention device and fuel assembly having such an end nozzle
    Patent number: 5180545
    Abstract: The lower end nozzle (1) comprises an adaptor plate (2), supporting feet (3) and a particle retention device (6) consisting of a filter plate pierced with holes and attached to the bottom face of the adaptor plate (2) over a substantial portion of its surface.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: January 19, 1993
    Assignees: Framatome, Cogema
    Inventor: Bernard Grattier
  • Fuel assembly of a nuclear reactor comprising a device for retaining particles contained in the cooling fluid of the reactor
    Patent number: 5154879
    Abstract: The particle retaining device comprises a plurality of tubes (18) parallel to fuel rods (14) of the fuel assembly, in all gaps between adjacent fuel rods (14) and throughout the length of a zone located between the upper part of a bottom nozzle (2) and the lower part of the spacer grid which is closest to the bottom nozzle (2).
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: October 13, 1992
    Assignees: Framatome, Cogema
    Inventor: Bernard Grattier
  • Filtration plate associated with a lower connector of a fuel assembly of a nuclear reactor
    Patent number: 5135710
    Abstract: The filtration plate (10), arranged in the lower part of the fuel assembly and ensuring the retention of particles contained in the cooling fluid of the reactor, has at least one active zone where it is pierced with holes (12) of a size determined according to the size of the particles to be retained. The active zones of the filtration plate come into alignment with a water-passage hole through the lower core plate of the reactor when the assembly is in operation. The water-passage orifices of the filtration plate (10) can consist of cutouts of square or triangular form or of stamped parts of the plate or be delimited by parallel lamellae constituting a grating.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: August 4, 1992
    Assignees: Framatome, Cogema
    Inventors: Bernard Grattier, Jean-Francois Rondepierre
  • Lower connector of a fuel assembly of a nuclear reactor having a particle filter
    Patent number: 5128096
    Abstract: The connector comprises an adaptor plate (6), supporting feet (7) and a flat element (10) constituting a filter for the retention of particles contained in the cooling fluid of the nuclear reactor. The flat element (10) is fastened to the lower part of the supporting feet (7) of the assembly, in order, during operation, to come to rest on the lower core plate (1) of the reactor. At least one zone of the flat element (10) constitutes a filtration grating located opposite a cooling-water passage (2) through the lower core plate (1).
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: July 7, 1992
    Assignees: Framatome, Cogema
    Inventor: Bernard Grattier