[1L13-17] Uncertainty Analysis Method

[1L16] Preliminary study of multi-group cross-section perturbation on random-sampling-based uncertainty analysis

*Tatsuya Fujita¹ (1. JAEA)

Keywords:Random sampling, Implicit effect, FRENDY, NJOY, SERPENT, JENDL-5, TENDL-2021

Past studies have mentioned that the treatment of implicit effect for cross-section perturbation affects the sensitivity coefficients and then the uncertainty analysis results for the k-infinity. The several approaches to consider the above implicit effect has also been discussed for the random-sampling-based uncertainty analysis. In this study, the influence due to implicit effect on typical nuclides and nuclear reactions in PWR 17×17 UO₂ and MOX fuel assemblies was confirmed prior to treat the implicit effect on the random-sampling-based uncertainty analysis in future studies. In the UO₂ fuel assembly, the influence due to implicit effect on the k-infinity was small, thus the uncertainty quantifdication only considering the explicit effect would be applicable. On the other hand, futher discussion about the influence due to implicit effect was necessary for the MOX fuel asembly.