ステンレス鋳鋼配管における超音波伝播シミュレーション
Simulation of Ultrasonic Wave Propagation in Cast Austenitic Stainless Steel Piping
著者:
坂本 一信 Kazunobu SAKAMOTO 古川 敬 Takashi FURUKAWA 古村 一朗 Ichiro KOMURA 上山 芳教 Yoshinori KAMIYAMA 三原 毅 Tsuyoshi MIHARA
発刊日:
公開日:
CASSCast austenitic stainless steelmodelingPressurized Water ReactorPWRsimulationUltrasonic testingvisualization
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.