Conference Proceedings Paper
Investigation of the Uncertainty of Governing Equation Systems in Thermalhydraulic Calculation
NURETH-14 - 2011 September 25-30
Tomasz Skorek (Gesellschaft fuer Anlagen- und Reaktorsicheheit mbH)
Bernhard Krzykacz-Hausmann (Gesellschaft fuer Anlagen- und Reaktorsicheheit mbH)
Henrique Austregesilo (GRS)
Investigation of the effect of uncertainty of the governing equation system on the results of the
code ATHLET has been performed on the basis of an uncertainty and sensitivity analysis of the
ROSA/LSTF SB-PV-09 experiment. The analysis has been conducted for the 5 and 6 equation
systems in ATHLET. The results confirmed that for the selected test case the uncertainties
resulting from both momentum equation approximations are very similar. The analysis also
showed that some output variables are influenced by approximation of momentum equation, e.g.
water level in the core whereas other output variables like maximum clad temperature are not. In
some cases the uncertainty of closure relations contributes considerably more to uncertainty of
the results than the uncertainty of momentum equation approximation.
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