Quantitative evaluation of nozzle edge read-outs of recurrent ultrasonic testing. ALOK - phase 1

The research project was intended to develop a technique for interpretation of ultrasonic read-outs obtained from recurrent tests of the nozzle inner corners in pressure vessels of boiling water reactors (BWR). A three-dimensional description of the test situation is required on account of the complicated component geometries. It is achieved by data acquisition of the object geometry, desription of the movements of the ultrasonic probes scanning the specimen surface, development of instructions for the mapping of the ultrasonic data into the reconstruction space, considering sonic field data, and representation of the reconstruction result in the object geometry with the aid of a CAD system. The reconstruction technique developed within the framework of the research project was designed for the time being to meet the requirements of the ALOK technique. For investigation of the performance of the reconstruction technique, measuring data were evaluated which were recorded at the C2 nozzle of the full-size vessel in Stuttgart, a scale model of the HDR-A2 nozzle, as well as at a nozzle plate. (orig./HP)