Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Identification on a Local Wall Thinning by Flow Acceleration Corrosion Inside Tee of Carbon Steel Pipe

탄소강 배관 티에서의 유동가속부식으로 인한 감육 현상 규명

  • 김경훈 (경희대학교 기계공학과) ;
  • 이상규 (경희대학교 대학원 기계공학과) ;
  • 강덕원 (경희대학교 대학원 기계공학과)
  • Received : 2011.02.24
  • Accepted : 2011.06.15
  • Published : 2011.06.30
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Abstract

When pipe components made of carbon steel in nuclear, fossil, and industry plants are exposed to flowing fluid, wall thinning caused by FAC(flow accelerated corrosion) can be generated and eventually ruptured at the position of pressure boundary. The aim of this study is to identify the locations at which local wall thinning occurs and to determine the turbulence coefficient related to local wall thinning. Experiment and numerical analyses for the tee sections of down scaled piping components were performed and the results were compared. In particular, flow visualization experiment which was used alkali metallic salt was performed to find actual location of local wall thinning inside tee components. In order to determine the relationship between turbulence coefficients and local wall thinning, numerical analyses were performed for tee components in the main feedwater systems. The turbulence coefficients based on the numerical analyses were compared with the local wall thinning based on the measured data. From the comparison of the results, the vertical flow velocity component(Vr) flowing to the wall after separating in the wall due to the geometrical configuration and colliding with the wall directly at an angle of some degree was analogous to the configuration of local wall thinning.

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References

  1. 1987, "Thinning of Pipe Walls in Nuclear Power Plants", Bulletin 87-01.
  2. NRC, 1988, "Feedwater Line Break, Supplement 3", Notice 86-106.
  3. KINS, 2004, "Search Report of Nuclear Power Plant accident and problem(2nd)-Case of Waterpipe Damage in Japan Mihamaunit3", 2004-1(040809F1-r2).
  4. Von W. Kasrner and K. Riedle, 1986, "Empirisches Modell zur Berechnung von Materialabtragen durch Erosionskorrosion", VGB Kraftwerkstechnik Vol. 66, pp. 1171-1178.
  5. W. Kastner. K. K. Riedle and H. Tratz, 1984. "Ezperimental Inspections on Material Loss due to Erosion-Corrosion", VGB Kraftwerkstechnik, Vol 64, No 5, pp. 411-423.
  6. H. Keller. 1978, "Corrosion and Erosion Problems in saturated-Steam Turbines", AIM Conf., Liege, Belgium, pp. 22-28.
  7. D. Choudhury, 1993, "Introduction to the Renormalization Group Method and Turbulence Modeling", Fluent Inc., Technical Memorandum TM-107.
  8. CHAM, 1994, "An Introduction into the Method for Implementing Multi-Block Grids and/or Grids with Refinements in PHOENICS", CHAM TR/401, Ver. 2.1.
  9. AECL, 2001. "Design Manual Chemistry Control", XX-03081/01200-DM-001 Rev. 4, pp. I-10.
  10. Sang Hoon Park, 2011, "A Study on a Local Thinning by Flow Acceleration Corrosion inside Carbon Steel Tee Piping", Kyung Hee University, Master Thesis
  11. G. A. Delp, J. D. Robison, and M. T. sedlack, 2004, "Erosion/ Corrosion in Nuclear Plant Steam Piping : Cause and Inspection Program guide Line", EPRI NP-3944.
  12. K. M. Hwang, T. E Jin and K. H. Kim, 2009, "Identification of Relationship between Local Velocity Components and Local Wall Thinning inside Carbon Steel Pipe", J. of Nuclear Science and Technology, Vol. 46, No. 5, pp. 469-478. https://doi.org/10.1080/18811248.2007.9711554