Control component structure

A control component structure comprising:

• a spider having a plurality of arms, at least one spider bore formed in said plurality of arms, said spider bore including an enlarged recess and a small recess with an upright truncated conical section forming a transition from the enlarged recess to the small recess, and
• a burnable poison rod including a tube terminating in a transverse end, a plug with a chamfered end that leads into a cylindrical portion, said cylindrical portion of the plug snuggly fitting within the tube and terminating in a radially protruding shoulder which engages the transverse end of the tube to which it is welded, and a stem protruding in the longitudinal direction from the central portion of the shoulder having a longitudinal stem bore extending through about half of the length of the stem, at least part of the stem which defines the stem bore is fixed within the truncated conical section, the enlarged recess and the small recess of the spider by outward deformation of that portion of the stem in order to releasably attach the rod to the spider, said stem adapted to substantially reshape itself by movement of the rod in a longitudinal direction with respect to the spider bore, while maintaining the structural integrity of the poison rod and maintaining the structural integrity of the spider.