Sensitivity and Uncertainty Analysis of Debris Bed Coolability
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
C6-2 Experimental Debris Bed Cooling

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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