Nuclear Data Uncertainty Analysis to Meet the Target Accuracy Requirements on the MYRRHA <i>k_eff</i>

MYRRHA is a flexible experimental facility being designed at the SCK CEN, in Mol, Belgium. Cooled by lead-bismuth, it conceived to operate both sub-critical mode, as an accelerator driven system, and critical fast reactor. In order comply with reactor design requirements, uncertainties due nuclear data must be quantified. Significant gaps between target accuracies have been systematically shown past. this paper, first, Sensitivity Uncertainty analysis JEFF-3.3 library of effective neutron multiplication factor k eff latest - v1.8 presented. Then, since accuracy for 300 pcm exceeded, Target Accuracy Requirement assessment performed find out required on cross section meet requested accuracy. To reach accuracy, reduction uncertainty fission capture sections 240 Pu evaluation needed.