Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Assessment of flow-accelerated corrosion-induced wall thinning in SA106 pipes with elbow sections

  • Received : 2023.09.17
  • Accepted : 2023.11.12
  • Published : 2024.04.25
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Abstract

A combination of flow-accelerated corrosion (FAC) tests and corresponding computational fluid dynamics (CFD) tests were performed to determine the hydrodynamic parameters that could help predict the highly susceptible location to FAC in the elbow section. The accelerated FAC tests were performed on a specimen containing elbow sections fabricated using commercial 2-inch carbon steel pipe. The tests were conducted at flow rates of 9 m/s under the following conditions: water temperature of 150 ℃, dissolved oxygen <5 ppb, and pH 7. Thickness reduction of the specimen pipe due to FAC was measured using ultrasonic testing. CFD was conducted on the FAC test specimen, and the turbulence intensity, and shear stress were analyzed. Notably, the location of the maximum hydrodynamic parameters, that is, the wall shear stress and turbulent intensity, is also the same location with maximum FAC rate. Therefore, the shear stress and turbulence intensity can be used as hydrodynamic parameters that help predict the FAC-induced wall-thinning rate. The results provide a method to identify locations susceptible to FAC and can be useful for determining inspection priority in piping systems.

Keywords

Acknowledgement

This work was supported by the South Korean Ministry of Trade, Industry and Energy; Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government (20224B10100030).

References

  1. R.B. Dooley, V.K. Chexal, Flow-accelerated corrosion in pipe wall downstream of orifice for water and air-water bubble flows, Int. J. Pres. Ves. Pip. 77 (2000) 85-90.  https://doi.org/10.1016/S0308-0161(99)00087-3
  2. I.S. Woosey, Assessment and avoidance of erosion-corrosion damage in PWR feedpiperwork, IAEA Report: IWG-RRPC-88-1, Vienna, 19910. 
  3. W. Kastner, M. Erve, N. Henzel, B. Stellwag, Calculation code for errosion induced wall thinning in piping systems, Nucl. Eng. Des. 119 (1990) 431-438.  https://doi.org/10.1016/0029-5493(90)90182-W
  4. T. Sydberger, U. Lotz, Relation between mass transfer and corrosion in a turbulent pipe flow, J. Electrochem. Soc. 129 (1982) 276-283.  https://doi.org/10.1149/1.2123812
  5. S. Moon, K. Kim, G.G. Lee, Y. Yu, D.-J. Kim, Pipeline wall thinning rate prediction model based on machine learning, Nucl. Eng. Technol. 53 (2021) 4060-4066.  https://doi.org/10.1016/j.net.2021.06.040
  6. EPRI, CHECWORKS Computer Program Users Guide, TR-103198-PI, 1997. 
  7. S. Trevin, M. Persoz, and T. Knook, Making FAC calculations with BRT-CICERO and updating to version 3.0, 17th international conference on nuclear engineering, Vol. 1: Plant Operations, Maintenance, Eng., Modifications Life Cycle, Comp. Reliabil. Mater, issues; Nest Generation Syst. Brussels Belgium: 81-88. 
  8. K. Fujiwara, M. Domae, K. Yoneda, and F. Inada, Effects of Water Chemistry and Fluid Dynamics on Wall Thinning Behavior Part 2 - Evaluation of Influencial Factors by Flow Accelerated Corrosion Tests. CRIEPI-Report: Q09028. 
  9. K. Fujiwara, and M. Domae, Effects of Water Chemistry on Wall Thinning Behavior in Single - Phase and Two - Phase Flow, CRIEPI-Report: Q11025. 
  10. Y.S. Lee, S.H. Lee, K.M. Hwang, Cause analysis of flow accelerated corrosion and erosion-corrosion cases in Korea nuclear power plants, Corrosion Sci. Technol. 15 (2016) 182-188.  https://doi.org/10.14773/cst.2016.15.4.182
  11. H.P. Rani, T. Divya, R.R. Sahaya, V. Kain, D.K. Barua, CFD study of flow accelerated corrosion in 3D elbows, Ann. Nucl. Energy 69 (2014) 344-351.  https://doi.org/10.1016/j.anucene.2014.01.031
  12. Flow Accelerated Corrosion in Power Plants, EPRI Report, 1998. TR-106611-R1, Palo Alto, CA. 
  13. D.-J. Kim, K.M. Kim, J.H. Shin, Y.M. Cheong, E.H. Lee, G.G. Lee, S.W. Kim, H. P. Kim, M.J. Choi, Y.S. Lim, S.S. Hwang, Oxidation behavior of steel with Cr content and water flow rate, Arch. Metall. Mater. 62 (2017) 1383-1387.  https://doi.org/10.1515/amm-2017-0213
  14. J. Han, S.H. Jeon, H.S. Shim, Y.K. Lee, D.H. Hur, Characteristics of Oxide Films Formed on A106 Gr.B and A335P22 in a Flowing Alkaline Solution at 150 ℃, Transactions of the Korean Nuclear Society Autumn Meeting, 2023. 
  15. L. Jingjun, L. Yuzhen, L. Xiaoyu, Numerical simulation for carbon steel flow-induced corrosion in high-velocity flow seawater, Anti-corrosion Methods & Mater. 55 (2008). 
  16. D.G. Kang, J.C. Jo, J.C. Jo, CFD application to the regulatory assessment of FAC-caused CANDU feeder pipe wall thinning issue, Nucl. Eng. Technol. 40 (2008) 37-48.  https://doi.org/10.5516/NET.2008.40.1.037
  17. M. El-Gammal, W.H. Ahme, C.Y. Ching, Investigation of wall mass transfer characteristics downstream of an orifice, Nucl. Eng. Des. 242 (2012) 353-360.  https://doi.org/10.1016/j.nucengdes.2011.10.009
  18. D.-J. Kim, S. W Kim, J.Y. Lee, K.M. Kim, S.B. Oh, G.G. Lee, J. Kim, S.S. Hwang, M. J. Choi, Y.S. Lim, S.H. Cho, H.P. Kim, Flow-accelerated corrosion assessment for SA106 and SA335 pipes with elbows and welds, Nucl. Eng. Technol. 53 (2021) 3003-3011.  https://doi.org/10.1016/j.net.2021.03.026
  19. L. Zeng, G.A. Zhang, X.P. Guo, C.W. Chai, Inhibition effect of thioureidoimidazoline inhibitor for the flow accelerated corrosion of an elbow, Corrosion Sci. 90 (2015) 202-215.  https://doi.org/10.1016/j.corsci.2014.10.011
  20. S. Ebara, H. Takamura, H. Hashizume, H. Yamano, Characteristics of flow field and pressure fluctuation in complex turbulent flow in the third elbow of a triple elbow piping with small curvature radius in three-dimensional layout, Int. J. Hydrogen Energy 41 (2016) 7139-7145.  https://doi.org/10.1016/j.ijhydene.2016.02.068
  21. L. Xu, Q. Zhang, J. Zheng, Y. Zhao, Numerical prediction of erosion in elbow based on CFD-DEM simulation, Powder Technol. 302 (2016) 236-246.  https://doi.org/10.1016/j.powtec.2016.08.050
  22. J. Tian, H. Huang, Z. Pan, H. Zhou, Effect of flow velocity on corrosion behavior of AZ91D magnesium alloy at elbow of loop system, Trans. Nonferrous Metals Soc. China 26 (2016) 2857-2867.  https://doi.org/10.1016/S1003-6326(16)64414-X
  23. K.M. Kim, Y. Choeng, E.H. Lee, J.Y. Lee, S. Oh, D. Kim, Effects of alloys and flow velocity on welded pipeline wall thinning in simulated secondary environment for nuclear power plants, Corrosion Sci. Technol. 15 (2016) 245-252.  https://doi.org/10.14773/cst.2016.15.5.245
  24. E. McCaffert, Validation of corrosion rates measured by the tafel extrapolation method, Corrosion Sci. 47 (2005) 3202-3215. https://doi.org/10.1016/j.corsci.2005.05.046