Nuclear data sensitivity/uncertainty analysis for XT-ADS

► The sensitivity and uncertainty analyses were performed to comprehend the reliability of the XT-ADS neutronic design. ► The uncertainties deduced from the covariance data for the XT-ADS criticality were 0.94%, 1.9% and 1.1% by the SCALE 44-group, TENDL-2009 and JENDL-3.3 data, respectively. ► When the target accuracy of 0.3%Δk for the criticality was considered, the uncertainties did not satisfy it. ► To achieve this accuracy, the uncertainties should be improved by experiments under an adequate condition.