Estimation of Depth and Volume for Defects by Eddy Current Testing

Abstract

The full length inspection of tubes in SG (Steam Generator) to detect defects using the signal measured by ECT (Eddy Current Testing) is performed in PWR (Pressurized Water Reactor) plant. According to technological advances of NDE (Non-Destructive Examination), the estimation of defect shape is required. In this study, by characterization of ECT signals which using imitative defects, we express relation with defect shape in approximate functions, and estimate defect shape using this function. As the result that we estimated depth and volume of defects, relative error of 80% data was restrained less than 19.7% in depth estimation and 27.2% in volume estimation.