Computer programs for developing source terms for a UF(sub 6) dispersion model to simulate postulated UF(sub 6) releases from buildings

摘要

Calculational methods and computer programs for the analysis of source terms for postulated releases of UF(sub 6) are presented. Required thermophysical properties of UF(sub 6), HF, and H(sub 2)O are described in detail. UF(sub 6) reacts with moisture in the ambient environment to form HF and H(sub 2)O. The coexistence of HF and H(sub 2)O significantly alters their pure component properties, and HF vapor polymerizes. Transient compartment models for simulating UF(sub 6) releases inside gaseous diffusion plant feed and withdrawl buildings and cascade buildings are also described. The basic compartment model mass and energy balances are supported by simple heat transfer, ventilation system, and deposition models. A model that can simulate either a closed compartment or a steady-state ventilation system is also discussed. The transient compartment models provide input to an atmospheric dispersion model as output.