Used nuclear fuel assembly installation acceptability determining method for boiling water reactor, involves determining when point corresponding to fuel irradiation level and initial enrichment is above identified curve

The method involves creating a series of enrichment curves relative to a present fuel irradiation level, where each curve represents a number of used fuel assemblies (2) that have an unfavorable axial distribution of the level. Number of the assemblies that have the distribution is marked. One curve of the series applied to a new used fuel assembly among the marked number of assemblies is identified. A point corresponding to the level and an initial enrichment for the assembly is found on a graph in which the curve is traced. Determination is made when the point is above the curve. Système de gestion dimensionnelle de réactivité, qui prend en compte les données de forme axiale d'épuisement d'un assemblage combustible nucléaire pour déterminer l'acceptabilité de l'installation de l'assemblage par rapport à d'autres assemblages (2) dans un conteneur de stockage.