Abstract
Finite element analysis techniques have been successfuly applied to the study of eddy current NDT phenomena in axisymmetric test geometries. Major applications of such computer code have related to the design of probes and the gaining of physical insight into just how electromagnetic fields interact with defects. This paper is concerned with an additional application of the code, namely to the simulation of practical testing situations which are too difficult and/or expensive to replicate in a laboratory environment. Numerical experiments are described which simulate the differential eddy current probe response to the build-up and chemical flushing of magnetite in the crevice gap of a PWR steam generator unit. The simulation results agree well with the only experimental data available to the authors and lead to the conclusion that conventional differential eddy current probes should be capable of characterizing crevice gap conditions with respect to the presence of magnetite.
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