Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Signal Characteristics of Eddy Current Test for Intergranular Attack of Steam Generator Tubes

증기발생기 전열관의 입계부식에 대한 와전류검사 신호특성

  • Choi, Myung-Sik (Nuclear Materials Technology Development Team, Korea Atomic Energy Research Institute) ;
  • Lee, Deok-Hyun (Nuclear Materials Technology Development Team, Korea Atomic Energy Research Institute) ;
  • Cho, Se-Gon ;
  • Yim, Chang-Jae ;
  • Han, Jung-Ho (Nuclear Materials Technology Development Team, Korea Atomic Energy Research Institute) ;
  • Hur, Do-Haeng (Nuclear Materials Technology Development Team, Korea Atomic Energy Research Institute)
  • 최명식 (한국원자력연구소 원자력재료기술개발팀) ;
  • 이덕현 (한국원자력연구소 원자력재료기술개발팀) ;
  • 조세곤 (㈜ 카이텍 와전류그룹) ;
  • 임창재 (㈜카이텍 와전류그룹) ;
  • 한정호 (한국원자력연구소 원자력재료기술개발팀) ;
  • 허도행 (한국원자력연구소 원자력재료기술개발팀)
  • Published : 2002.04.30
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Abstract

Beacuse intergranular attack (IGA), one of the locallized corrosion forms occurring on steam generator tubes, can not be fabricated by an electric discharge machining method, there are few data for the eddy current test (ECT) characteristics of IGA. In this paper, the characteristics of eddy current signals are evaluated using nonexpanded tubes with IGA defects formed in 0.1 M sodium tetrathionate solution at $40^{\circ}C$. The detectability and sizing accuracy of IGA were discussed in terms of the coil type and frequency of the ECT probes.

가동중인 증기발생기 전열관에서 발생하는 결함 유형 중의 하나인 입계부식은 방전가공에 의한 모의 시편 제작이 불가능하므로 입계부식에 대한 와전류검사 신호의 특성이 잘 알려져 있지 않다. 본 연구에서는 0.1 M sodium tetrathionate 용액에서 비확관 전열관에 입계부식을 형성시키고 와전류검사 신호를 수집하여 평가하였다. 이를 통하여 탐촉자의 종류와 주파수에 따른 선호 특성 및 입계부식의 깊이 변화에 따른 검출능을 비교하였다.

Keywords

References

  1. D. H. Hur, M. S. Choi, D. H. Lee, J. A. Park, J. H. Han, 'Fabrication and use of corrosion defect specimens for enhancement of ECT reliability for nuclear steam generator tubing', J. Korean Society for Nondestructive Testing, Vol. 20, No.5, pp.451-456, (2000)
  2. A. P. L. Turner, J. P. N. Paine, in Steam Generator Reference Book, Volume 2/3, pp. 13-1, EPRI Report TR-I03824, EPRI, (1994)
  3. J. Siegel, 'Detecting SG tube cracks in difficult places', Nuclear Engineering International, Vol. 41, No. 498, pp. 18-19, (1996)