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Enhancing Nuclear Safety


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Analysis of the first two tests of the Phébus FP experimental programme

Kissane, M.P., Congrès français sur les aérosols 2002, J. Aerosol Sci. 34, pp1107-8, 2003. (Abstracts of the CFA-2002)

Summary

Phebus FP studies the phenomenology of severe accidents in light-water cooled nuclear reactors. Tests cover fuel-rod degradation and behaviour of fission products released via the coolant system into the containment building. Analysis using computer codes aims to identify modelling weaknesses where, here, focusing on aerosol aspects, the main conclusions from analysis of the first two tests are drawn. It is seen that in weakly turbulent conditions: for a supersaturated vapour with competition between homogeneous nucleation, heterogeneous nucleation and condensation on structures, codes can significantly underestimate this latter condensation; where thermophoresis dominates, codes overestimate deposition despite prior validation of the widely-used Talbot interpolation model. Possible explanations are identified. In the containment, codes generally model aerosol concentration decrease satisfactorily with adequate reproduction of the split between diffusiophoresis and settling.
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