Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Development of a Guided Wave Technique for the Inspection of a Feeder Pipe in a Pressurized Heavy Water Reactor

  • Cheong, Yong-Moo (Division of Nuclear Materials Technology Development, Korea Atomic Energy Research Institute) ;
  • Lee, Dong-Hoon (Division of Nuclear Materials Technology Development, Korea Atomic Energy Research Institute) ;
  • Kim, Sang-Soo (Division of Nuclear Materials Technology Development, Korea Atomic Energy Research Institute) ;
  • Jung, Hyun-Kyu (Division of Nuclear Materials Technology Development, Korea Atomic Energy Research Institute)
  • Published : 2005.06.01
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Abstract

One of the recent safety issues in the pressurized heavy water reactor (PHWR) is the cracking of the feeder pipe. Because of the limited accessibility to the cracked region and a high dose of radiation exposure, it is difficult to inspect all the pipes with the conventional ultrasonic method. In order to solve this problem, a long-range guided wave technique has been developed. A computer program to calculate the dispersion curves in the pipe was developed and the dispersion curves for the feeder pipes in PHWR plants were determined. Several longitudinal and/or flexural modes were selected from the review of the dispersion curves and an actual experiment has been carried out with the specific alignment of the piezoelectric ultrasonic transducers. They were confirmed as L(0,1)) and/or flexural modes(F(m,2)) by the short time Fourier transformation(STFT) and were sensitive to the circumferential cracks, but not to the axial cracks in the pipe. An electromagnetic acoustic transducers(EMAT) was designed and fabricated for the generation and reception of the torsional guided wave. The axial cracks were detected by a torsional mode(T(0,1)) generated by the EMAT.

Keywords

Acknowledgement

Supported by : Ministry of Science and Technology

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