Decommissioning and Waste Treatment Hazard Evaluation and Modeling

Hazards encountered during decommissioning and waste treatment involve different issues, emphasis, and scenarios than encountered during normal facility operations. This paper provides examples from experience in analysis and modeling of diverse facilities, framed in terms of custom phenomena models and their incorporation into integral facility analysis modeling. Models for entrainment of contamination and aerosol behavior are described and applied. The FATE™ (Facility Flow, Aerosol, Thermal, and Explosion) computer program is described, and example calculations are given for contamination release due to a dust explosion in order to demonstrate the sensitivity to boundary conditions and the use of engineered safeguards.