Rod spacer grid for a nuclear fuel assembly, and a corresponding assembly

摘要

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.

主权项

1. A grid for spacing nuclear fuel rods in a nuclear fuel assembly, the grid defining a substantially regular array of cells and comprising:
a peripheral belt having an upper edge and a lower edge, the peripheral belt having guide fins extending inwardly on at least one of the upper and lower edges, the peripheral belt in plan view having a substantially square shape with four sides and four corners, the at least one upper and lower edge of the peripheral belt having setbacks formed in the at least one upper and lower edge of the peripheral belt and extending inwardly and positioned between adjacent guide fins of the same side of the at least one upper and lower edge; and crossed inner plates surrounded by the peripheral belt, wherein the guide fins bear against regions of the inner plates that constitute stiffeners.