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概要

It is well known that volumetric inspection by ultrasonic testing for cast austenitic stainless steel (CASS) piping, which is extensively used in primary loop of Japanese pressurized water reactors (PWR), is challenging due to unexpected beam skewing, dispersion and attenuation by its coarse and anisotropic crystal structures resulted from manufacturing process. The miss or false calling of the flaws and the deterioration of sizing performance are of great concerns in the ultrasonic testing for the material. A simulation model of the ultrasonic wave propagation in CASS was developed to understand the unique behaviors in CASS which gives adverse effect on the ultrasonic testing, and to confirm the field ultrasonic testing data. The developed method was compared with the actual wave propagation obtained through the visualization technique applied to the CASS mock-up and verified to reproduce actual phenomena well including beam skewing, dispersion due to the coarse grain structures.

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