Pipe wall thickness measurements by ultrasonic (UT) sensors can be difficult as the roughness of the inner surface develops by certain corrosion mechanisms. In this study, the applicability of flexible UT sensors with single and dual element transducer were evaluated using carbon steel plates with localized sand erosion that simulates pipe walls with rough inner surface. While the thickness measurement by single transducer sensors with B-B method failed after certain amount of erosion, the newly develop...
英字タイトル:
Evaluation of online thickness monitoring system for wall thinning by erosion.

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-...
英字タイトル:
Verification of online thickness monitoring system for radioactive pipes