Abstract: A method of evaluating at least one quantity relating to the distortion of a nuclear fuel assembly, the method including the following steps: the nuclear fuel assembly is placed in a volume of water bounded by an upper free surface; a camera is placed outside the volume of water, above the free surface; at least one image of at least one lateral face of the nuclear fuel assembly is taken; the at least one image is analyzed graphically and the at least one quantity relating to the distortion of the nuclear fuel assembly is deduced therefrom.

Abstract: A method of evaluating at least one quantity relating to the distortion of a nuclear fuel assembly, the method including the following steps: the nuclear fuel assembly is placed in a volume of water bounded by an upper free surface; a camera is placed outside the volume of water, above the free surface; at least one image of at least one lateral face of the nuclear fuel assembly is taken; the at least one image is analyzed graphically and the at least one quantity relating to the distortion of the nuclear fuel assembly is deduced therefrom.

Abstract: A process for measuring the thickness of a layer of oxide on a rod cladding in a fuel assembly comprising a bundle of rods parallel to each other and held in a framework comprising spacer grids for transversely holding rods distributed in an axial direction of the bundle.

Abstract: A process for measuring the thickness of a layer of oxide on a rod cladding in a fuel assembly comprising a bundle of rods parallel to each other and held in a framework comprising spacer grids for transversely holding rods distributed in an axial direction of the bundle

Abstract: A measuring tool (10) comprising two jaws (15b, 15c) which can be moved one with respect to the other in a first horizontal direction and moved back towards each other by an elastic means, is set up level with the spacer-grid (3) of the fuel assembly. The measuring tool (10) is displaced in a second horizontal direction perpendicular to the first horizontal direction and to a front face (6a) of the spacer-grid (3) such that the jaws (15b, 15c) each come into contact with a lateral face (6b, 6c) of the spacer-grid (3) and the distance between the jaws (15b, 15c) is measured in the first horizontal direction. The tool (10) is mounted so as to rotate freely about an axis parallel to the vertical longitudinal direction of the fuel assembly (1) such that the measuring tool (10) is oriented freely with respect to the front face (6a) of the spacer-grid (3), when the measuring tool is displaced in the second horizontal direction.