Conference Proceedings Paper
Transient Void, Pressure Drop and Critical Power BFBT Benchmark Analysis and Results with VIPRE-W/MEFISTO-T
NURETH-14 - 2011 September 25-30
Jean-Marie Le Corre (Westinghouse Electric Sweden AB)
Carl Adamsson (Westinghouse Electric Sweden AB)
Pablo Avarez (Westinghouse)
A benchmark analysis of the transient BFBT data , measured in an 8x8 fuel assembly design
under typical BWR transient conditions, was performed using the VIPRE-W/MEFISTO-T code
package. This is a continuation of the BFBT steady-state benchmark activities documented in 
and . All available transient void and pressure drop experimental data were considered and the
measurements were compared with the predictions of the VIPRE-W sub-channel analysis code
using various modeling approaches, including the EPRI drift flux void correlation. Detailed
analyses of the code results were performed and it was demonstrated that the VIPRE-W transient
predictions are generally reliable over the tested conditions. Available transient dryout data were
also considered and the measurements were compared with the predictions of the VIPREW/
MEFISTO-T film flow calculations. The code calculates the transient multi-film flowrate
distributions in the BFBT bundle, including the effect of spacer grids on drop deposition
enhancement, and the dryout criterion corresponds to the total liquid film disappearance. After
calibration of the grid enhancement effect with a very small subset of the steady-state critical
power database, the code could predict the time and location of transient dryout with very good
Individual Conference-Paper Copies (Electronic Where Available):
- For CNS members, the first 5 copies per calendar year are free, and additional copies are $10 each.
- For non-members, the price is $25 for the first Conference-paper copy in a request, and $10 each for additional copies of papers in the same conference and in the same request.
- Contact the CNS office to order reprints.