Abstract: A testing arrangement (14) and a method for materials testing at lead-throughs in a cap of a pressurized-water reactor, comprising a flexible sword (85) which at one end is equipped with a probe. Since the lead-throughs consists of a first tube passing the cap and welded to it, and a second tube inserted in the first tube, the weld joint has to be inspected from below via a gap between the tubes. In order to do this by means of a manipulator, a pinching arrangement (32) is arranged, which by pressing the inner tube towards one side widens the gap at the opposite side so that the sword can be inserted.The pinching arrangement and the sword can then be displaced so that the sword and the widened gap moves around the inner tube, in order that the whole weld and its surrounding area can be inspected.