Abstract
A methodology is developed for performing statistical analysis of the uncertainties in thermohydraulic calculations on the basis of the idea of the GRS method. The coefficients, which are to be varied, in the semiempirical closure relations are determined for the RELAP5/MOD3.2 and MELCOR 1.8.3 codes; their distribution functions and variation ranges are chosen. In the RELAP5/MOD3.2 code, input of the coefficients is built-in in order to be able to vary the closure relations. The procedure makes it possible to estimate with a prescribed degree of reliability the confidence interval for the calculations of key parameters for experimental stands and operating setups and to determine the dominant factors influencing the computational results.
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Afremov, D.A., Zhuravleva, Y.V., Mironov, Y.V. et al. A Procedure for Performing a Statistical Analysis of the Uncertainties in Thermohydraulic Calculations. Atomic Energy 93, 642–650 (2002). https://doi.org/10.1023/A:1021092614473
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DOI: https://doi.org/10.1023/A:1021092614473