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A series of four integral tests has been completed using the Falcon facility. The 21 months programme was conducted in support of the Phebus-FP experiments performed at CEA/CEN Cadarache and was designed to investigate the transport and deposition of fission products under conditions pertaining to a severe accident in a light water reactor. These experiments have been modelled using the VICTORIA, RAFT, SOPHAEROS, CONTAIN, ITHACA and INSPECT codes. Pre- and post-test analyses of the integral experiments were conducted using severe accident modelling codes. FAL-17 and 18 were analyses using the VICTORIA, RAFT and SOPHAEROS codes. The results highlighted a number of important issues, possible inadequacies in the thermochemical database for species at temperatures lower than 1000 K, or the absence of important species in the thermodynamic databases and the importance of measuring the fission product release rates into the Falcon silica tube. The calculations predicted that the transport and speciation of caesium was modified by boric acid, which was consistent with the experimental results. A number of discrepancies between the predictions and the data were noted. Multicomponent aerosols were detected during the post-test analysis, but the behaviour of such aerosols was not included in the calculations. Further investigation, including the possibility of model development, is warranted.

Additional information

Authors: BEARD AM ET AL., AEA Technology Centre Winfrith, Fuel Performance Division, Reactor Chemistry Department, Dorchester (GB)
Bibliographic Reference: EUR 15766 EN (1994) Vol.I : 372 pp., Vol.II: 366 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publication Department, I-21020 Ispra (Va.) (IT)
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