Fission Product Experimental Program: Validation and Computational Analysis

Leclaire, Nicolas; Ivanova, Tatiana; Létang, Eric; Girault, Emmanuel; Thro, Jean-François

doi:10.13182/nse07-86

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…We used pre-evaluated relative standard deviations by the following reasons: 1) there is not yet in APOLLO2 a robust procedure to compute covariance matrices for a few group XS; 2) we tried keeping methodological affinity with other participants of UAM; and, last but not least, 3) it is wellknown that Nuclear Data (ND) and their uncertainties have different nature being fundamentally independent1 (M. Salvatores, 2014) and such use of different sources for ND and uncertainties would not compromise S/U analysis. The last one has been also supported by the comparisons performed years ago inside the IRSN (N. Leclaire, 2009), between APOLLO2 and SCALE6.1 and SCALE6.2b3, for keff and XS calculations.…”

Section: Cross Sections Uncertainty Treatmentsupporting

confidence: 53%

Uncertainties propagation in the UAM numerical rod ejection benchmark

Sargeni

Fouet

Ivanov

et al. 2020

Annals of Nuclear Energy

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This paper presents the execution and the results of a rod ejection benchmark inspired by the UAM benchmarks II-2b: cross sections uncertainties propagation during a rod ejection transient in a mini-core (3x3 PWR-type assemblies), without feedback. Performing transient computations in two groups time-dependent neutron diffusion approximation while starting from a steady-state power of 0.1409 MW, we obtained a mean power peak around 0.25 MW with a standard deviation of, nearly, 1.5%. The timedependent standard deviation curve follows the time-dependent mean power curve and the relative standard deviation, in a percentage of the mean power, increases with the mean power peak value. We found, too, that the first group diffusion coefficient and the first group absorption cross section are, practically, the only contributors to the total power peak variance. Drawbacks and findings from the exercise provide essential input for uncertainty propagation in a further multi-physics simulation of a postulated rod ejection accident.

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Section: Cross Sections Uncertainty Treatmentsupporting

confidence: 53%