Abstract: A twist-proof mechanical connecting assembly includes first and second components. The first component has a recess formed therein with a groove in the form of at least one pocket. A connecting element in the form of a bolt penetrates the first component and is secured to the second component for interconnecting the components. The bolt has a polygonal head including a safety cup embedded in the recess. At least part of the safety cup is outwardly bent into the at least one pocket for locking the safety cup to the first component and securing the connecting element against loosening.

Abstract: In a reactor pressure vessel for a boiling-water reactor having a feedwater inlet nozzle, the combination includes a heat protective pipe received in the nozzle and having an extension projecting therefrom, a feedwater sparger ring disposed in a given plane, and means for connecting the feedwater sparger ring to the heat protective pipe, the connecting means includes an elbow extending angularly from the given plane and connecting the feedwater sparger ring to the extension of the heat protective pipe.