Abstract: A spacer grid for a nuclear fuel assembly for a light water reactor delimits a substantially regular array of cells housing nuclear fuel rods. The spacer grid further including supporting members which project into the cells from the peripheral belt of walls. The inner surface of at least one supporting member has before irradiation a concave shape in a plane transverse to the longitudinal direction. The inner surface of the contact part of the supporting member also has a convex shape in a longitudinal plane orientated radially with respect to the central axis of the corresponding cell before irradiation.

Abstract: A spacer grid for a nuclear fuel assembly for a light water reactor delimits a substantially regular array of cells housing nuclear fuel rods. The spacer grid further including supporting members which project into the cells from the peripheral belt of walls. The inner surface of at least one supporting member has before irradiation a concave shape in a plane transverse to the longitudinal direction. The inner surface of the contact part of the supporting member also has a convex shape in a longitudinal plane orientated radially with respect to the central axis of the corresponding cell before irradiation.

Abstract: The process produces a sandwich composite panel including at least one cellular core having on its faces skins of fiber/resin composite material which are fastened to the cellular core. At least one strip of composite material is formed, the profile of which corresponds to that of the peripheral flank of the panel preform. The strip is applied against the flank of the panel preform. The preform, provided with at least one such strip on its border, is subjected to a temperature, rise, without positive pressure being applied, until the resin of the strip has cured and then, after the curing of the strip and before the curing of the resin of the skins, is subjected to the continuation of the temperature rise, with positive pressure being applied.