Clark, RP; (1990) An evaluation of the use of coils of different orientations for the eddy current inspection of austenitic stainless steel vessels. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

With the advent of the next generation of nuclear reactors, the liquid metal cooled fast breeder reactors (LMFBR), new problems are being considered in many fields including that of non—destructive testing (NDT). Within NDT the more extensive use of eddy current techniques as an alternative to ultrasonics is one such area of investigation, particularly with regard to the inspection of the austenitic stainless steel primary vessel of the fast reactor. The inspection of the outer surface of the pressure vessel for surface breaking defects has been considered. The feasibility of defect detection in stainless steel welds using eddy currents has been demonstrated using standard eddy current equipment. An evaluation of the use of coils in a horizontal orientation has been undertaken, both from theoretical and experimental viewpoints. The comparison of these results with those obtained for a more conventional vertical axis coil has indicated that the horizontal axis coil has potential advantages for this particular inspection case. A coil optimisation study has demonstrated that the potential advantages of horizontal axis coils can be more fully realised through a careful choice of probe coil. The investigation has highlighted the increased understanding that can be obtained about eddy current testing by way of complimentary experimental and theoretical studies which consider an engineering problem of current interest.

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