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Scaling Methodology for the Direct ECC Bypass During LBLOCA Reflood Phase With Direct Vessel Injection System: Its Development and Validation

[+] Author Affiliations
H. K. Cho, G. C. Park

Seoul National University, Seoul, Korea

B. J. Yun, T. S. Kwon, C.-H. Song

Korea Atomic Energy Research Institute, Daejeon, Korea

Paper No. ICONE10-22744, pp. 967-974; 8 pages
  • 10th International Conference on Nuclear Engineering
  • 10th International Conference on Nuclear Engineering, Volume 4
  • Arlington, Virginia, USA, April 14–18, 2002
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-3598-7 | eISBN: 0-7918-3589-8
  • Copyright © 2002 by ASME


From the two dimensional two-fluid model a new scaling methodology, named the “modified linear scaling”, is suggested for the scientific design of a scaled-down experimental facility and data analysis of the direct ECC bypass under LBLOCA reflood phase. The characteristics of the scaling law are its velocity is scaled by a Wallis-type parameter and the aspect ratio of experimental facility is preserved with that of prototype. For the experimental validation of the proposed scaling law, the air-water tests for direct ECC bypass were performed in the 1/4.0 and 1/7.3 scaled UPTF downcomer test section. The obtained data are compared with those of UPTF Test21-D. It is found that the modified linear scaling methodology is appropriate for the preservation of multi-dimensional flow phenomena in downcomer annulus, such as direct ECC bypass.

Copyright © 2002 by ASME



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