In Service Inspection Of Steam Generator Tubing Using Multiple Frequency Eddy Current Techniques
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In-Service Inspection of Steam-Generator Tubing Using Multiple-Frequency Eddy-Current Techniques
Although a rapid, accurate, and easy-to-use inspection method for steam-generator tubes is clearly needed, it is not entirely provided by our present eddy-current tests. The signals from eddy-current tests are affected by changes in tube wall thickness, the location and size of defects, the electrical conductivity, the magnetic permeability, and the tube-to-tube support spacing and denting (which changes the probe-to-tube spacing). Simultaneous variations in these test properties produce signals that are ambiguous in present commercial eddy-current instruments.