Patents by Inventor Jürgen Stabel

Jürgen Stabel 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: 9390817
    Abstract: A fuel assembly for a pressurized water nuclear reactor includes a multiplicity of fuel rods which extend in a longitudinal direction and are guided in a plurality of spacers that are spaced apart from one another axially. The spacers of an upper region have a lower flow resistance in a transverse direction perpendicular to the longitudinal direction, than the spacers of a lower region.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: July 12, 2016
    Assignee: Areva GmbH
    Inventors: Jürgen Stabel, Hans-Joachim Lippert, Mingmin Ren, Bernd Dressel
  • Patent number: 8867693
    Abstract: A grid (13) for supporting nuclear fuel pencils (3) for a nuclear fuel assembly (1) comprising a peripheral belt (17), the peripheral belt (17) comprising on at least one of its edges (35, 37) guide fins (33) is disclosed. The edge (35, 37) of the peripheral belt (17) has between the adjacent guide fins (33) recesses (39) towards the inside of the grid (13). The invention is applicable, for example, to pressurized water reactors.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: October 21, 2014
    Assignee: Areva NP
    Inventors: Pascal Burfin, Michel Bonnamour, Gilles Margier, Jürgen Stabel-Weinheimer, Mingmin Ren
  • Patent number: 8345815
    Abstract: A fuel assembly for a pressurized water nuclear reactor contains a multiplicity of fuel rods which are guided in a plurality of axially spaced spacers which in each case form a square grid, composed of grid webs, with a multiplicity of cells arranged in rows and columns. In each case one control rod guide tube is guided through a number of these cells. At least one spacer is configured to be mechanically stronger in a first partial region than in a second partial region. In this second partial region, the spacer is provided with at least one resisting element which protrudes into a flow sub-channel formed between the fuel rods and increases the flow resistance. The resisting element counteracts a reduction associated with the mechanically weaker configuration, in the flow resistance in the second partial region and in this manner effects a homogenization of the hydraulic behavior of a spacer which is mechanically inhomogeneous on account of the varying mechanical configuration.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: January 1, 2013
    Assignee: Areva NP GmbH
    Inventors: Jürgen Stabel, Udo Borsdorf
  • Publication number: 20110305311
    Abstract: In a fuel element for a pressurized-water reactor, in addition to spacers, flow-guiding structural parts are arranged. The flow guiding parts include four outer webs which, in a plane oriented perpendicularly to the central longitudinal axis, surround a square inner region of which the center point lies on the central longitudinal axis. At their lower longitudinal side facing the flowing cooling water in the operating state, the outer webs are provided with deflection lugs pointing towards the inner region and are structurally identical, wherein mutually opposite outer webs are arranged mirror-symmetrically with respect to a center plane extending in the axial direction. Such a structural part forms, at most for a number of fuel rods which is smaller than their total number in the fuel element, cells through which a respective fuel rod is guided. The number of these cells, which are situated in a row or column, is smaller than the number of the fuel rods respectively situated in this row or column.
    Type: Application
    Filed: November 11, 2009
    Publication date: December 15, 2011
    Applicant: AREVA NP GMBH
    Inventors: Juergen Stabel, Bernd Dressel, Horst-Dieter Kiehlmann
  • Patent number: 7668282
    Abstract: The core of a pressurized water reactor is assembled in such a way that if the fuel elements on the edge of the core are bent, these fuel elements are oriented such that the bending of the fuel elements points outwards in a convex manner. When the reactor is in operation, forces arise which increase the size of small gaps between the fuel elements at the expense of greater gaps and counteract the bending effect of the fuel elements.
    Type: Grant
    Filed: June 12, 2003
    Date of Patent: February 23, 2010
    Assignee: Areva NP GmbH
    Inventors: Jürgen Stabel, Mingmin Ren
  • Patent number: 7424086
    Abstract: A fuel element for a pressurized water reactor has fuel rods guided through a number of axially spaced spacers. The spacers form a square grid with mesh openings arranged in rows and columns. Support tubes that do not contain fuel pass through a number of the mesh holes and are joined to the meshes . The support tubes are spread out in positions within the grid with a predetermined number of support tubes and a distribution thereof within the grid, which is rotationally symmetric about 90° with regard to a rotation about the central axis of the spacer, the central axis is perpendicular to the grid plane, the number of rows and columns that do not contain any support tubes is minimal. Optionally, remaining inner rows and columns that do not contain any support tubes are not situated next to one another.
    Type: Grant
    Filed: December 28, 2004
    Date of Patent: September 9, 2008
    Assignee: Areva NP GmbH
    Inventors: Jürgen Stabel, Udo Borsdorf, Hans-Peter Hübsch
  • Patent number: 6888911
    Abstract: Transverse vibrations of the pellet columns included in the fuel rods of fuel elements are limited by elastically mounting the fuel rod jacket tubes in the mesh of spacer grids. When the fuel rods are supported in this way, flexural vibrations of a higher order occur that lead to damage to the jacket tubes caused by fretting. These vibrations are the less dampened the more rigid the fixture of the fuel rod is. These vibration conditions are more easily excited and more strongly dampened when the pellet columns are more mobile, thereby removing vibration energy from the fuel element and avoiding damage caused by fretting. The mobility of the columns can be increased by increasing the gap between the pellet and the jacket tube, or by using constructions in which a torque M?10 N mm on the fuel rod leads to a tilting angle ??0.1°.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: May 3, 2005
    Assignee: Framatome ANP GmbH
    Inventors: Jürgen Stabel-Weinheimer, Mingmin Ren