Modeling and simulation has a long history with researchers and scientists exploring fusion energy technologies through SciDAC (https://sites.google.com/view/rfscidac4/home?authuser=0).  Researchers and scientists in the Department of Energy are developing new tools to predict the performance, reliability and economics of fusion reactor concepts (https://theory.pppl.gov/research/research.php?rid=10). The new computational tools will allow researchers to explore in ways never before practical, at the level of detail dictated by the governing phenomena, all the way from important changes in plasma materials interactions and disruption mitigation all the way to the full-scale system studies of complete fusion power plants.