EVALUATION OF CRITICAL EXPERIMENTS IN THE UNIVERSITY OF WISCONSIN NUCLEAR REACTOR (UWNR) WITH UNCERTAINTY QUANTIFICATION

An improved computational model of the University Wisconsin Nuclear Reactor (UWNR) was developed to support benchmark evaluation recent data acquired during an experimental campaign conducted at UWNR. Previous efforts led a scripted UWNR for automated generation MCNP6 and Serpent inputs. This capability extended SCALE/KENO. All three tools were used evaluate variety zero-power, fresh-critical configurations, results agreed well. The shuffling core configuration, which allows modeling burnup depleted critical configurations. successfully predicts reactivity over time, after accounting initial bias. inclusion SCALE/KENO input enables sensitivity uncertainty analyses using TSUNAMI Sampler modules SCALE. A preliminary analysis performed with nuclear uncertainties while direct perturbation calculations geometry material uncertainties, helped identify parameters largest effect on eigenvalue. transient transport Model in Mammoth/Rattlesnake is under development simulate experiments. existing models are provide CAD file meshing homogenized cross-sections. In conclusion, provides increased confidence various states will unique use by other analysts.