Checking casing tube of irradiated fuel rod, to monitor quality and safety in nuclear power station, by extracting small piece(s) of tube within the power station

A method for checking a casing tube (27) of an irradiated fuel rod (26) involves extracting at least one piece (80) of the casing tube within a nuclear power station. An independent claim is included for apparatus for extracting a piece from a casing tube (27) of an irradiated fuel rod (26), comprising (a) a processing chamber with an opening for introduction of at least one region (including a plenum) of the fuel rod and (b) at least one device projecting into the processing chamber for introducing an opening into the casing tube. Bei einem Verfahren zum Überprüfen eines Hüllrohres (27) eines bestrahlten Brennstabes (26) wird innerhalb einer Kernkraftwerksanlage aus dem Hüllrohr (27) wenigstens ein Teilstück (80) entnommen, das zur weiteren Untersuchung in eine Heiße Zelle transportiert wird.