C211 励磁制御渦電流試験法による補強板付配管の減肉評価(OS6 減肉検査・モニタリングおよび劣化時の材料強度)

概要

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No effective inspection method exists at present for detection and evaluation of wall thinning under the reinforcing plates of T-tubes in nuclear power plants, and the establishment of the inspection method is highly required. In this study, eddy current testing (ECT) with controlled exciting field is applied to evaluation of wall thinning under the reinforcing plates of T-tubes, and their feasibility is discussed. In order to induce eddy current field in deep region of doubled plates, pulse excitation and probe structures are investigated. Through experiments using specimens simulating tubes with reinforcing plates, it is shown that pulsed ECT and conventional TR type eddy current probe with optimized configuration have a capability of detecting and sizing the wall thinning under reinforcing plates.
一般社団法人日本機械学会の論文
2011-06-22