SPACER GRID WITH UNSYMMETRIC DIMPLE FOR THE DEBRIS FILTERING

摘要

A spacer grid with an unsymmetrical dimple for filtering a debris is provided to minimize a cross section in a horizontal direction and to reduce a maximum diameter for inflow of the debris through an effective cross section structure of the dimple. A spacer grid with an unsymmetrical dimple for filtering a debris(D) includes a spacer grid(20) and a dimple(21). The spacer grid divides a plurality of unit grid cells by crossing strips with slots horizontally and vertically and reciprocally inserting the slots. The dimple is formed by asymmetrically bending the strips to be divided into a short piece(212) and a long piece(211), projected from centers of grid surfaces of the spacer grids in a perpendicular direction, and installed on the grid surface in a direction to have a minimum cross section for an axial direction of the spacer grid to support a lower rod short stopper(14) of a fuel rod through a line contact between the long piece of the dimple and the lower rod short stopper.