VARIANCE-BASED SENSITIVITY ANALYSIS APPROACH APPLIED TO HYDROGEN MIGRATION AND REDISTRIBUTION MODEL IN BISON

摘要

In this work, we demonstrate a global sensitivity anduncertainty analysis approach to quantify the impact ofuncertainty in the hydrogen migration and redistributionmodels implemented in the U.S. Department of EnergyOffice of Nuclear Energy fuel performance code Bison. Inthis summary, we provide a brief description of the physicalphenomena studied and the sensitivity analysis method used.To identify the key parameters related to hydrogenmigration and redistribution model in Bison, we study theimpact of the variance of the model parameters on theamount of hydrides formed near the outer surface of thecladding, where hydrides are more likely to form. Toquantify the impact of the input variance of the parameterson the output variations we compute the variance-basedindices (Sobol indices). The results of this work show thatthe activation energy of precipitation Eprec and the heat oftransport Q* are the key parameters, followed by diffusionparameters.