Abstract
Eddy current testing is widely used to inspect steam generator tubing in a nuclear power plant. The steam generator has been safely operated by plugging flawed tubes. It is important to evaluate the flaw depth from the eddy current data in order to check whether it is within the plugging criterion or not. In contrast to the volumetric flaw, the crack depth is not easy to obtain precisely and consistently from the eddy current data due to many parameters and the complexity of sizing methods. The currently used cracksizing methods were reviewed and the parameters that are able to influence the results were selected from the laboratory tests. In this paper, some depth-sizing methods were proposed and the best one for each crack type was determined through the comparison between the round robin test results of a nondestructive examination and the results of a destructive one.
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