VARIANCE REDUCTION FACTOR CALCULATIONS FOR NEUTRONICS PARAMETERS OF ACCELERATOR-DRIVEN SYSTEM

摘要

In order to identify nuclear data on which further improvement is effective to reduce nuclear data-induced uncertainties of accelerator-driven system (ADS) neutronics parameters, variance reduction factors (VRFs) for k_(eff), β_(eff) and coolant void reactivity are calculated. Obtained VRFs suggest that improvement of plutonium-238 nuclear data is quite effective to reduce the uncertainties of k_(eff) and β_(eff) during the operation of ADS, and that improvement of lead-206 elastic and inelastic scattering cross sections is also important to reduce the uncertainties of coolant void reactivity. Important energy ranges of these nuclear data are also specified by VRFs.