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Evaluation of Multiparameter Eddy Current Technology for Inspection of Steam Generator Tubing

机译：多参数涡流技术在蒸汽发生器管道检测中的应用

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Multifrequency/multiparameter eddy current instrumentation for inspection of steam generator tubing has recently become commercially available. The instrumentation offers the steam generator owner a means to conduct parallel tests, i.e., normal tube integrity tests, sludge profiling and dent sizing in one pull through the tube. In addition, the real time suppression of extraneous variables such as support plates, denting and ID noise can be accomplished. The intercontrole 1C3FA multiparameter instrument has been used for an assessment of multiparameter technology to detect and characterize defects in the presence of extraneous variables. A general mixing sequence has been developed which is applicable to both recirculating steam generators (RSG) and once-through steam generators (OTSG). Candidate mixing frequencies have been identified through the use of a computer program which models the 1C3FA sequential mixing network. Using appropriate models of defects at support plates and dented support plates, multiparameter technology has been found to offer advantages over single frequency approaches for more reliable defect detection and characterization.

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