抄録
Flow Accelerated Corrosion (FAC) is a pipe wall thinning phenomena to be monitored and managed in power plants with high priority At present, its management has been conducted with conservative evaluation of thinning rate and residual lifetime of the piping based on wall thickness measurements However, noticeable case of wall thinning was occurred at separation and union pipe It is a problem to manage section beneath reinforcing plate of T-tube pipe and "crotch" of T-joint pipe, the region where measurement is difficult to conduct with ordinary ultrasonic testing device In this study, numerical analysis for T-tube and T-joint pipe was conducted, and wall thinning profile by FAC was evaluated by calculating mass transfer coefficient In the case of union flow from mam and branch pipe, the wall thinning profile of T-tube showed the tendency of increase at mam pipe On the other hand, noticeable profile appeared at "crotch" in T-joint
