[2J06-09] uncertainty evaluation

[2J07] Bias factor and cross-section adjustment methods using prompt neutron decay constant

*Tomohiro Endo¹, Akio Yamamoto¹ (1. Nagoya University)

Keywords:prompt neutron decay constant, perturbation theory, sensitivity analysis, bias factor method, cross-section adjustment method

By utilizing the Feynman-α method with the bootstrap method, the prompt neutron decay constant α and the experimental error were measured at the Kyoto University Critical Assembly (KUCA) in the shutdown state. On the basis of data assimilation techniques such as the bias factor and cross-section adjustment methods using (1) the measurement value of α and (2) sensitivity coefficients of α and k_eff that were estimated by the first-order perturbation theory, we try reducing the nuclear-data-induced uncertainty of predicted k_eff for another KUCA experimental core.