| 摘要 |
1. Process for the construction of a fuel assembly for a nuclear reactor of the light water type, comprising, in known manner, two end members (2, 3) bridged by hollow guide tubes (4) and to which are fixed spacer grids (5) in which, fissile fuel rods (6) are fixed, of the type in which the end members (2, 3) are preliminarily fixed to the guide tubes (4) which have previously been slid with light friction on the spacer grids (5), final rigid fixing is provided between the spacer grids (5) and the guide tubes (4), at least one of the end members is loosened to slide fuel rods (6) into the remaining empty positions on the spacer grid (5) and the final locking is provided on the end member or members, characterised in that the preliminary fixing of the end members (2, 3) is achieved without inducing any torsion on the guide tubes (4) located between the two end members (2, 3), and in that longitudinal traction is applied to at least one of the two ends of the guide tubes (4), and in that the final rigid fixing of the spacer grid (5) is provided while the guide tubes (4) are placed under tension and with no induced torsion. |
