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概要

Abstract: In nuclear power plants (NPPs), due to flow accelerated corrosion (FAC) and liquid droplet impingement (LDI) of the coolant inside the pipe, there may happen local wall thinning defects on the inner surface of a pipe. Concerning the material of pipes, there are mainly two types, low-carbon steel and stainless steel. In this paper, the feas ibility of quantitative nondestructive evaluation (QNDE) to wall thinning in stainless steel pipes using pulsed eddy current testing (PECT) method is discussed. Two major works are conducted in this study. The first part work is that an efficient forward numerical simulation solver for PECT signals has been proposed and developed based on the Fourie r series method combined with an interpolation strategy and the database approach. The second part work is that an inversion algorithm of PECT has been proposed and validated, based on the developed efficient simulator of PECT signals and a deterministic optimization strategy, for the profile reconstruction of wall thinning in pipes of NPPs. Throug h the QNDE of pipe wall thinning based on the developed efficient PECT forward simulator and inversion analysis using the experimental PECT signals of simulated specimen, the efficiency and the robustness of the proposed PECT forward and inversion algorithm have been demonstrated, and the feasibility of PECT for wall thinning QNDE is also validated.

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