Verification of online thickness monitoring system for radioactive pipes
村山 諒太 Ryota MURAYAMA 川見 勇介 Yusuke KAWAMI 鈴木 聡則 Akinori SUZUKI 森田 一郎 Ichiro MORITA 吉田 正志 Masashi YOSHIDA
EMAT Inspection Nondestructive evaluation Online monitoring Pipe wall thinning Sensor technology Ultrasonic Testing
Online pipe thickness monitoring sensors, EMAT, Thin-film UT sensor and FLEXDRY UTM were installed to Unit4 spent fuel pool cooling system of Fukushima No.1 Power Plant. Pipe wall thinning data and ultrasonic waveform were recorded in a control PC near the pipe. EMAT can be controlled by remote PC in a office far from No4 Unit through local area network. The measured pipe wall thickness value by FLEXDRY UTM are parallel with results of conventional UM sensor well. Starting of online monitoring of Thin-film UT and FLEXDRY UTM are scheduled within several months. These measurement systems can expect reduction in radiation dose of pipe inspection workers for high radiation pipes.