FATE 2.0 (Facility Flow, Aerosol, Thermal and Explosion Model) software is designed to replace computer codes currently used for design and safety analyses for U.S. Dept. of Energy projects at the Hanford site and elsewhere. These include codes such as HADCRT for tank farms and waste treatment plants and WESF, PFP, HANSF MCO and HANSF for spent nuclear fuel, sludge and the site’s “T plant” chemical separation facility. New features include the flammability and combustion of gases, vapors and aerosols model, and entrainment of deposits to form aerosols modeling.