AN EDDY CURRENT EXAMINATION METHOD FOR THE OUTSIDE DIAMETER AXIAL CRACKS IN STEAM GENERATOR TUBES USING MOTORIZED ROTATING PANCAKE COIL

摘要

PURPOSE: An eddy current examination method for the outer diameter axial cracks in a steam generator tube using a motorized rotating pancake coil is provided to reduce the size of an error by reducing an RMSE value. CONSTITUTION: An eddy current examination method for the outer diameter axial cracks in a steam generator tube using a motorized rotating pancake coil is as follows. An eddy current examination signal is obtained by an MRPC with two pancake coils and one plus point coil(S10). Outer diameter axis cracks are confirmed by analyzing the signal properties of each frequency from the obtained eddy current examination signal(S11). A correction curve is formed in a channel corresponding to the specific frequency of the plus point coil(S12). The depth from the starting point of the confirmed outer diameter axis cracks to the ended point of the cracks is measured(S13).