Sizing techniques for crack indications od eddy current data in steam generator tubes

This paper describes the sizing methodology for stress corrosion cracking which lies in steam generator tubes. It is not easy to analyze exactly the depth and length of the crack from the eddy current data. The crack-sizing for the steam generator tube during the in-service inspection was not performed until July 2005 in Korea. However it is necessary to evaluate the depth and length of the crack in order to complete the condition monitoring and operational assessment of the Steam Generator Management Program. The currently available crack-sizing techniques were introduced from Electric Power Research Institute. Prior to applying to the field analysis, the round robin tests for those techniques were carried out by the domestic analysts. The results suggest that it is necessary to develop new techniques since the deviations for some types of crack are relatively large.