Endo, Tomohiro Watanabe, Kenichi Chiba, Go Yamanaka, Masao van Rooijen, Willem Frederik Geert Pyeon, Cheol Ho Nuclear data-induced uncertainty quantification of prompt neutron decay constant based on perturbation theory for ADS experiments at KUCA <p>In experimental benchmarks of the accelerator-driven system (ADS) conducted at the Kyoto University Critical Assembly (KUCA), the prompt neutron decay constant <math><mi>α</mi></math> 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 <math><mi>α</mi></math> are useful information to validate the numerical results predicted by the prompt <math><mi>ω</mi></math>-eigenvalue calculation. In this study, the numerical analysis of <math><mi>α</mi></math> using a multi-energy group S<sub>N</sub> 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 EO<sub>N</sub> quadrature was utilized. In addition, the sensitivity coefficients of <math><mi>α</mi></math> 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 <math><mi>α</mi></math> were validated successfully by the experimental results of the pulsed neutron source method, compared with the range of the nuclear data-induced uncertainties.</p> Prompt neutron decay constant;KUCA;ADS;measurement;ω-eigenvalue;sensitivity analysis;uncertainty quantification 2019-08-14
    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
10.6084/m9.figshare.9616073.v1