RAFT: A Computer Model for Formation and Transport of Fission Product Aerosols in LWR Primary Systems

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Abstract
A computer model, RAFT (Reactor Aerosol Formation and Transport), has been developed to predict the size distribution and composition of the particles (aerosols) formed from condensation of the fission product and control rod material vapors released in LWR accidents. The underlying theory of RAFT considers the processes of homogeneous and heterogeneous nucleation, aerosol agglomeration, and aerosol and vapor deposition, in conjunction with the equilibrium chemistry of the Cs-I-Te-O-H-Ag-In-Cd-inert gas system. Calculations using RAFT show that under most accident conditions, the particle size spectrum is determined primarily by the competition between the homogeneous and heterogeneous nucleation mechanisms, rather than the agglomeration mechanism, and that direct vapor deposition on structural surfaces is an important mechanism for the scavenging of fission product vapors.

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