초록 ▼

A nuclear fuel assembly comprises a bundle of elongated fuel rods distributed at nodes of a regular lattice and a structure for retaining said fuel rods. The structure has a lower end piece, and upper end pieces, tie rods connecting said end pieces and grids distributed along the tie rods for mainta

A nuclear fuel assembly comprises a bundle of elongated fuel rods distributed at nodes of a regular lattice and a structure for retaining said fuel rods. The structure has a lower end piece, and upper end pieces, tie rods connecting said end pieces and grids distributed along the tie rods for maintaining the fuel rods at the nodes. The structure consists of two substructures slidable with respect to each other in the direction of the fuel rods. Springs located between the two substructures spread apart the two end pieces for respective abutment against a lower core plate and an upper core plate.

대표청구항 ▼

For use in a nuclear reactor core cooled by an upwardly directed coolant flow and defined by a lower core plate and an upper core plate, a nuclear fuel assembly comprising: a bundle of elongated fuel rods distributed at nodes of a regular lattice, a structure for retaining said fuel rods, having a l

For use in a nuclear reactor core cooled by an upwardly directed coolant flow and defined by a lower core plate and an upper core plate, a nuclear fuel assembly comprising: a bundle of elongated fuel rods distributed at nodes of a regular lattice, a structure for retaining said fuel rods, having a lower end piece, an upper end piece, a plurality of tie rods extending between said end pieces, and grids distributed along said tie rods for maintaining said fuel rods at said nodes, said structure consisting of two substructures slidable with respect to each other in the direction of said fuel rods, a first one of said substructures including the upper end piece arranged for direct abutment against said upper core plate and some of said rods which are secured to said upper end piece and the other of said substructures including the lower end piece arranged for direct abutment against said lower core plate and the other of said tie rods which are secured to said lower end piece, spring means for spreading apart said two substructures, whereby said lower end piece is retained in abutment against said lower core-plate and means for limiting the amount of spreading of said two structures to a predetermined value.