NUCLEAR FUEL ASSEMBLY CONTROL SPIDER COMPRISING REMOVABLE RODS AND METHOD FOR REPLACING A ROD IN SUCH A SPIDER

摘要

1. Control cluster associated with a spider having several fins (1) distributed angularly and each having at least one sleeve (2) of longitudinal axis pierced from side to side by a bore (3) and rods (5) closed at one of their respective ends by a plug (6) extended in the longitudinal direction by a shank (7) adapted to be introduced into the bore (3) of the corresponding sleeve (2) and comprising means of longitudinal abutment against the sleeve, characterized in that the shank (7) comprises mutually spaced parts whose diameter corresponds to that of the bore (3), said shank being of sufficient length to have a portion projecting above the sleeve (2) when the rod (5) is in abutment on the sleeve (2), said projecting portion comprising a threaded section (9) situated entirely at a distance above the fin (1), in that the fin (1) and the rod (5) comprise means for relative locking against rotation, and in that the cluster comprises internally threaded fastening parts (14) each of which is adapted to be screwed onto the threaded section (9) of the corresponding shank (7) and to abut said fin to fix the rod (5).