Ultrasonic defect-locating devices

摘要

An ultrasonic defect-locating device has an axial track and a fixed track (22, 24) extending in the circumferential direction. Said tracks are positioned in a space formed between a pressure vessel of a nuclear reactor and a thermally insulating wall (11A) surrounding the latter and extend in the axial direction or the circumferential direction of the pressure vessel. At an intersection of the axially extending fixed track (22) and the fixed track (24) extending in the circumferential direction, there is installed a rotary track (14) which can be rotated by a chain (16) and whose angle of rotation is limited by two stops (28, 29). A carrier unit (34), which carries an ultrasonic defect-locating unit (70), can be driven on the tracks (22, 24) to carry out the ultrasonic defect location in order to detect any fault which may be present in the pressure vessel. To transfer the carrier unit (34) from the axially extending fixed track (2) to the fixed track (24) extending in the circumferential direction, the carrier unit (34) is first transferred from the axially extending track (22) to the rotary track (14) and, after the rotary track (14) has been swivelled, it is transferred from the latter onto the fixed track (24) extending in the circumferential direction. IMAGE