Control rod for pressurized water nuclear reactor has absorber rod in cover tube that has recesses in its lower section as round or linear grooves

摘要

A control rod for a pressurized water nuclear reactor comprises an absorber rod (2) in a cover tube (3) having at least one recess (10a-d) in its lower section (9) that at the most occupies a part of the surrounding surface. Preferably the recesses are circumferential grooves (10a), have a screw form or are long grooves.