Transactions of the Korean Society of Pressure Vessels and Piping (한국압력기기공학회 논문집)

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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A Study on Distinguishing between Parent material and Weld ECT Signal at Seal Weld Zone for Steam Generator Tubing

증기발생기 전열관 밀봉용접부에서의 모재와 용접부 ECT 신호 구분에 관한 연구

  • 천근영 (한국수력원자력(주) 중앙연구원) ;
  • 신기석 (한국수력원자력(주) 중앙연구원) ;
  • 남민우 (한국수력원자력(주) 중앙연구원)
  • Received : 2015.05.14
  • Accepted : 2015.06.05
  • Published : 2015.06.30
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Abstract

Many crack flaws have been detected at tubing seal weld zone in Steam Generator with Alloy600 material tubes. it is very difficult to discriminate the signal from parent material and that from weld zone because weld zone gives complicated ECT signal due to manufacturing processes. ECT signal analysis in the seal weld zone is very important since the tubes with crack in this area shall be out of service by plugging. The purpose of this paper is to distinguish between Parent material and Weld Zone ECT signal in the seal weld zone through the demonstration test of Steam Generator seal weld mock-up.

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References

  1. N. C. Cho, Y. S. Kang, H. N. Kim and K. H. LEE, 2014, "Degradation characteristics of tubes in the steam generator tubesheet", KPVP, Vol.10 pp.1-3
  2. KHNP, 2014.3 "Integrated Guidelines of Steam Generator Management Program" Rev.3, attachment1 pp.3-4
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  4. KHNP, 2013.2 "OPR-1000 Steam Generator ECT Guidelines" Rev.2, pp.69-87
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