%0 Journal Article %A Endo, Tomohiro %A Watanabe, Kenichi %A Chiba, Go %A Yamanaka, Masao %A van Rooijen, Willem Frederik Geert %A Pyeon, Cheol Ho %D 2019 %T Nuclear data-induced uncertainty quantification of prompt neutron decay constant based on perturbation theory for ADS experiments at KUCA %U https://tandf.figshare.com/articles/journal_contribution/Nuclear_data-induced_uncertainty_quantification_of_prompt_neutron_decay_constant_based_on_perturbation_theory_for_ADS_experiments_at_KUCA/9616073 %R 10.6084/m9.figshare.9616073.v1 %2 https://tandf.figshare.com/ndownloader/files/17263559 %K Prompt neutron decay constant %K KUCA %K ADS %K measurement %K ω-eigenvalue %K sensitivity analysis %K uncertainty quantification %X

In experimental benchmarks of the accelerator-driven system (ADS) conducted at the Kyoto University Critical Assembly (KUCA), the prompt neutron decay constant α was measured using two types of pulsed neutron sources, i.e. a D-T neutron source and a spallation neutron source driven by a 100-MeV proton beam. The measurement results of α are useful information to validate the numerical results predicted by the prompt ω-eigenvalue calculation. In this study, the numerical analysis of α using a multi-energy group SN neutron transport code was carried out for the uranium-lead zoned experimental cores. To reduce the discretization error owing to the deterministic code, the KUCA geometry was modelled in detail as a three-dimensional heterogeneous plate-by-plate geometry, and an improved variant of EON quadrature was utilized. In addition, the sensitivity coefficients of α with respect to nuclear data were efficiently evaluated by first-order perturbation theory, followed by nuclear data-induced uncertainty quantification based on the 56 neutron-energy group SCALE covariance library. Consequently, the numerical results of α were validated successfully by the experimental results of the pulsed neutron source method, compared with the range of the nuclear data-induced uncertainties.

%I Taylor & Francis