Monitoring System with Thin-Film UT Sensor for Power Plant

Periodical measurements of pipe wall thickness for power plant are performed during outage. Periodical water level measurements are performed during plant operation to detect gas-void in the piping. But significant wall thinning or significant gas-void might not be detected by periodic measurements. In order to detect before damage occurrence of piping, it is necessary to perform the periodic measurement with high frequency. However, periodical measurement during plant operation is difficult because of high-temperature and high cost, because additional work for installation and removal of heat insulating material and a scaffold is required at every measurement. Therefore, monitoring during plant operation may be necessary for improvement of system safety. In order to improve these issues, monitoring system consists of thin-film UT sensor and pulsar receiver had been developed.

References
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  • K. T. Wu, C. K. Jen, M. Kobayashi, A. Blouin, “Integrated Piezoelectric Ultrasonic Receivers for Laser Ultrasound in Non-destructive Testing of Metals”, Journal of Nondestructive Evaluation (2011) 30:1-8.
  • N. Fujita, I. Seki, T. Matsuura, Y. Yamamoto, M. Kurokawa, “Development of thickness measurement and thickness trend monitoring technology using high-temperature thin-film UT sensor”, Japan Society of Maintenology, Vol.10, July 2013.
  • T. Kodaira, I. Seki, T. Tsuruta, N. Kawase, T. Matsuura, Y. Yamamoto, S. Kawanami, “Monitoring of pipe wall thickness using high-temperature thin-film UT sensor”, 11th International Conference on Non Destructive Evaluation, May 2015.
  • T. Kodaira, Y. Yamamoto, T. Kimura, T. Tsuruta, I. Seki, “Wall thickness monitoring using high-temperature thin-film UT sensor”, JSNDI Fall Conference 2016, October 2016.
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