Abstract: The nuclear fuel element according to the invention comprises a can, which is sealed at its ends by plugs, whereof a cylindrical portion is force fitted into the can. The internal diameter of the can can vary between a maximum diameter and a minimum diameter, the diameter of the cylindrical portion being equal to said minimum diameter. Three serrations machined on the cylindrical portion form beads, whose thickness is equal to half the difference between the maximum diameter and the minimum diameter of the can.

Abstract: A calibrating distributor of cylindrical members incorporating a cylindrical member supply station, a drum for transferring the members between the supply and a distribution station, the drum having equidistant cavities, each of which receive one of the members, a calibrating plate to transfer the cylindrical members having a diameter exceeding a maximum permitted diameter between the distribution station and an ejection station, the plate having equidistant calibrated holes, which are at least partly frustum-shaped, whose smallest diameter is equal to the maximum permitted diameter, a drive for the stepwise rotation of the transfer drum and the calibrating plate, and a pusher for forcing the cylindrical members contained in the cavities into and through calibrated holes whereby the members having a diameter exceeding the maximum permitted diameter remain jammed in the holes and are ejected at the ejection station.