Development of a model on vapor nucleation and condensation onto aerosols : Application to severe accident scenarios in light water reactors
The analysis of severe accidents in LWRs (light water reactors) reveals the crucial role that the vapour to aerosol conversion processes play in the evaluation of the risk associated with nuclear power generation. The major aim of this work is the development of a mechanistic approach to model vapour nucleation and condensation onto particles. The model was conceived to be compatible with the multi-component aerosol scheme included in the VICTORIA code. The performance of the model was checked by application to a number of severe accident conditions. Representative FP (fission product) species were chosen and a wide range of parameters, such as concentration and mean size of the suspended aerosols, vapour supersaturation degree and system pressure, was covered. The results of the application exercise are useful to contrast typical characteristic times of the vapour to aerosol conversion phenomena with those of the particle agglomeration and deposition mechanisms. The overlap between these two types of processes is a key aspect to be considered when developing FP transport codes.
Bibliographic Reference: Paper presented: 20th Reunion Anual de la Sociedad Nuclear Espanola, Cordoba (ES), October 26-28, 1994
Availability: Available from (1) as Paper EN 38539 ORA
Record Number: 199411175 / Last updated on: 1994-11-25
Original language: en
Available languages: en