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Numerical Case Study on the LDIE Degradation Occurred in the Vent Header of a High Pressure Feedwater Heater

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DOI: 10.4236/wjnst.2014.41005    3,221 Downloads   4,464 Views  

ABSTRACT

Piping installed in nuclear power plants is affected by various types of degradation mechanisms and may be ruptured due to gradual thinning. The degradation mechanisms such as flow-accelerated corrosion (FAC), cavitation, liquid droplet impingement erosion (LDIE), etc., can lead to costly outages and repairs and possibly affect plant reliability. In August 2008, the header pipe in the high pressure feedwater heater vent system leaked at a Korean nuclear power plant. After cutting the pipe during refueling outage, it was identified that the leak was due to LDIE. This paper presents the numerical analysis results, using various multi-phase models of ANSYS FLUENT for the purpose of identifying the cause of the LDIE. The numerical analysis methods which are most similar to the damage of the pipe are proposed for the comparison of analysis results with each multi-phase model.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

H. Seo, K. Hwang and C. Choi, "Numerical Case Study on the LDIE Degradation Occurred in the Vent Header of a High Pressure Feedwater Heater," World Journal of Nuclear Science and Technology, Vol. 4 No. 1, 2014, pp. 26-32. doi: 10.4236/wjnst.2014.41005.

References

[1] K. M. Hwang and H. Yun, “Investigation on the Evaluation for Liquid Droplet Impingement Erosion through Prediction Model and Experiment,” Journal of Manufacturing Science and Technology, B (Korean), Vol. 35, 2011, pp. 1105-1110.
[2] H. K. Seo and K. M. Hwang, “Numerical Analysis Study to Identify the Leak Cause of a Feedwater Heater Vent Pipe in a CANDU Plant,” 7th NCFE, Korea, 2012.
[3] ANSYS, Inc., “ANSYS FLUENT Theory Guide,” Release 13.0, 2010.
[4] ANSYS, Inc., “ANSYS FLUENT User’s Guide,” Release 13.0, 2010.
[5] R. Li, H. Ninokata and M. Mori, “Parametric Investigation on the Effect Factors for Liquid Droplet Impingement Erosion,” Proceeding of AJK Joint Fluids Engineering Conference, AJK2011-03034, Japan, p.7. 2011,

  
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