渦電流試験法を用いた高温環境におけるき裂進展の 定量的モニタリング
Quantitative Monitoring of Crack Propagation in High Temperature Environment Using Eddy Current Testing
著者:
内一 哲哉 Tetsuya UCHIMOTO 糟谷 高志 Takashi KASUYA 高木 敏行 Toshiyuki TAKAGI 庄子 哲雄 Tetsuo SHOJI
発刊日:
公開日:
BWR environmentCorrosion fatigueCrack propagationEddy current testingHigh temperature monitoring
概要
This paper discusses the possibility of in-situ quantitative evaluation of crack propagation using Eddy Current Monitoring (ECM) system in a Boiling Water Reactor (BWR) environment. For the purpose, ECM experiment was conducted at a System Safety Benchmark Facility (SSBF). The target for the monitoring was a large-scale pipe specimen made of austenitic stainless steels 304L, 316L, and carbon steel STS410, connected by weld joints of nickel based alloy 182 within the SSBF. Slits were prepared at the Heat Affected Zones (HAZs) and weld lines from the inner surface of the pipe specimen. Eddy Current Testing (ECT) probes were arranged on the outer surface of the pipe specimen, and observed crack propagation of slits. In order to discuss the crack propagation quantitatively, numerical simulation of eddy current testing signals was carried out. The numerical signals are consistent with the experimental signals, which indicate that in-situ eddy current monitoring system has the capability to monitor the crack growth quantitatively.
