Comparison of uncertainty quantification methods for fast reactor neutronics - 343

This paper describes a comparative study of two Uncertainty Quantification (UQ) techniques for reactor neutronics analysis. Adjoint- and sampling-based uncertainty quantification approaches are applied to a simplified model of a sodium-cooled fast reactor to evaluate uncertainty in four integral parameters (void reactivity, Doppler reactivity, Keff, and control rod reactivity). Results obtained with the two UQ methodologies are compared and discussed. This preliminary work, performed in a well-studied field like neutronics, will inform sensitivity and uncertainty method selection for future calculations in other disciplines like coupled neutronics/thermo-hydraulics. (authors)