Abstract
In this paper, absolute and differential eddy current signals from various defects in the steam generator tube are numerically predicted and their slope characteristics are investigated. The signal changes due to frequency increase are also observed. Then, the analysis of mixed defect signals affected by the presence of a ferromagnetic support plate is attempted. Axisymmetric finite element modeling is used for signal prediction and this leads us to the slope angle analysis of the signal. Results show that differential signals are useful for locating the position of a defect under the support plate, while absolute signals are easy to presume and interpret even though the effect of support plate is mixed. Understanding of respective signal characteristics would be useful for more reliable inspection.
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