Conference Proceedings Paper
Sensitivity and Uncertainty Analysis of Debris Bed Coolability
NURETH-14 - 2011 September 25-30
Sergey Yakush (A. Yu. Ishlinskii Institute for Problems in Mechanics of the Russian Academy of Sciences)
Pavel Kudinov (Royal Institute of Technology)
Nazar Lubchenko (Moscow Institute of Physics and Technology)
Theoretical studies of top-fed debris bed coolability available so far have been focused on
obtaining the Dryout Heat Flux (DHF) as a function of debris bed parameters (mean particle
diameter and porosity). In this paper, uncertainty analysis is carried out to quantify the
influence of different factors on DHF. Global sensitivity analysis is applied to rank the drag
model parameters according to their effects on DHF and average pressure drop (epistemic
uncertainty). The most influential model parameters are then optimized to achieve the best fit
to experimental data available. Finally, aleatory uncertainties due to randomness of the debris
bed formation scenario and respective physical parameters (particle diameter, porosity) are
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