An Eddy Current Examination Method for the Outside Diameter Axial Cracks in Steam Generator Tubes Using Motorized Rotating Pancake Coil

摘要

as a method to evaluate the magnitude of the crack in the outer celebrated MRPC test, ; acquiring an eddy current testing signal by using a predetermined frequency by two pancake coils and a single point plus an MRPC coil is mounted, ; comprising the steps of: analyzing the signal characteristics of each frequency obtained from the eddy current test signal determine the outer celebrated crack, ; The steps to create the calibration curve in the channel corresponding to the specific frequency of the coil with respect to the point plus the identified other celebrated crack, ; and measuring the depth of a crack to the point that ends at regular intervals from the point that the above-identified and other celebrated cracks start, ; is achieved by having a step for calculating the shape data of the effective depth from the depth compared to the measured length.