FUEL ELEMENT FOR A PRESSURIZED-WATER NUCLEAR REACTOR
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.
1 - 8 . (canceled)
9 . A fuel assembly for a pressurized-water nuclear reactor, comprising:
a plurality of spacers spaced apart in a direction of a center longitudinal axis, and a multiplicity of fuel rods guided in said plurality of spacers;
each of said spacers forming a square grid made of grid webs with a multiplicity of cells arranged in rows and columns;
a flow-guiding structural part disposed at least between two axially spaced-apart spacers;
said flow-guiding structural part including four outer webs that surround, in a plane oriented perpendicular to the center longitudinal axis, a square inner region having a center point located on the center longitudinal axis;
said outer webs carrying deflector vanes on a lower longitudinal side thereof facing a flow of cooling water in operation, said deflector vanes pointing in a direction of the inner region;
said outer webs being identical in terms of design and mutually opposite said outer webs being disposed in mirror-symmetrical fashion with respect to a center plane that extends in the axial direction;
said structural part forming, at most for a number of fuel rods that is smaller than an overall number of fuel rods in the fuel assembly, cells through which in each case one fuel rod is guided;
wherein a number of said cells that are disposed in a row or column is smaller than a number of the fuel rods in each case disposed in the respective said row or column.
10 . The fuel assembly according to claim 9 , wherein said cells, which are formed by the structural part, are located exclusively in corner regions of the fuel assembly.
11 . The fuel assembly according to claim 9 , wherein said outer webs are arranged at a lateral edge of the fuel assembly.
12 . The fuel assembly according to claim 9 , wherein said outer webs form a contiguous frame.
13 . The fuel assembly according to claim 9 , wherein an inner web is associated with each outer web, said inner web is parallel to said inner web and said inner web is provided, on a lower longitudinal side thereof, which faces the flowing cooling water, with deflector vanes pointing in the direction of the inner region, wherein said inner webs are identical in terms of design and mutually opposite inner webs are arranged in mirror-symmetrical fashion with respect to a center plane that extends in the axial direction.
14 . The fuel assembly according to claim 13 , wherein only fuel rods of a row or column are arranged between said outer web and said inner web.
15 . The fuel assembly according to claim 13 , wherein said lower longitudinal side of said inner web is arranged below said lower longitudinal side of said outer web.
16 . The fuel assembly according to claim 13 , wherein said inner webs form a contiguous frame.