Recent developments in PSI BEPU analysis for SPERT-III RIA transient: ND uncertainty breakdown and kinetic parameters uncertainty assessment

نویسندگان

چکیده

• Best-Estimate-Plus-Uncertainty analysis of SPERT-III RIA experiments. Nuclear Data uncertainty propagation in CASMO down to SIMULATE-3K. Identify dominant nuclear data contributors overall uncertainty. Impact cross-section perturbation the resonance self-shielding calculation. kinetic parameters’ uncertainties. The current research summarizes recent developments performed within PSI BEPU methodology and corresponding results on In this regard, three main studies have been carried out. First, an breakdown study has order identify quantify their respective contributions uncertainties parameters interest. On other hand, second was devoted assess impact considering effect cross section (limited for time being U-238 capture) calculation, known as implicit effect, different transient. Finally, third conducted with goal parameter uncertainties, such delayed neutron yields associated decay constants, quantification first study, based ENDF/B-VII.1 library, showed that, steady-state, contributor static reactivity worth k-eff is U-235 nubar, followed by then capture sections. However, transient, e.g. total power reactivity, inelastic scattering. More interestingly, it found contribution uncertainty, during initial excursion phase, due while reversal becomes contribution, even one end Moreover, demonstrated a clear systematic decrease all inclusion effect. steady state, Doppler coefficient relative could be reduced up 30%, which reflected especially phase where plays key role, parameters. estimated regarding both steady-state transient parameters, shown larger values compared those data.

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ژورنال

عنوان ژورنال: Nuclear Engineering and Design

سال: 2021

ISSN: ['0029-5493', '1872-759X']

DOI: https://doi.org/10.1016/j.nucengdes.2021.111378