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The FALCON tests are important because they are the only tests worldwide with a reasonably representative mixture of species, sufficiently accurate measurements and well enough defined boundary conditions to assess the transport in the region where the important fission products condense. There are three main approaches to fission product transport typified by the codes RAFT, VICTORIA and TRAPMELT. Analysis of the FALCON results shows that the ideal solution assumption of VICTORIA is not valid and it can seriously underpredict the volatility of elements such as iodine, that are present in low concentrations. VICTORIA also over-estimates vapour-aerosol interactions. Although RAFT cannot reproduce all the experimental results, its hypotheses - at least as far as FALCON is concerned - are sounder. The FALCON results also indicate that thermophoresis is reasonably well predicted by the codes and that it is not necessary to model multi-component aerosols to reproduce the measurements. Once condensed, all the elements behave in a similar manner.

Additional information

Authors: SHEPHERD I, JRC Ispra (IT)
Bibliographic Reference: Paper presented: CSRP, Maryland (US), May 1-5, 1995
Availability: Available from (1) as Paper EN 39040 ORA
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