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ISP 47 "Containment thermal-hydraulics" Computers codes exercise based on TOSQAN, MISTRA and THAI experiments.

J. Vendel, P. Cornet, J. Malet, H. Paillère, M.L. Caron-Charles, E. Studer, K. Fischer, H.J Allelein, Eurosafe 2002, 4-5 november 2002, Berlin (Deutshland).

Summary

International consensus is that a detailed knowledge of containment thermal-hydraulics is necessary to predict the local distribution of hydrogen, steam and air inside the containment under representative conditions of severe accident. Looking back at the ISPs that have been reviewed in the SOAR, it becomes all too apparent that every ISP has involved a rather complicated integral test and that there has been a lack of separate phenomena testing within the ISP framework. The main objective of the ISP-47 is to demonstrate the actual capability of CFD and 'lumped parameter' codes in the field of containment thermal-hydraulics, e.g. to predict the hydrogen distribution under LOCA conditions. The proposed activities will lead to a significant improvement of the reliability of severe accident containment models/codes. As recommended in the SOAR this approach follows a strategy being progressive in modelling difficulty and it is proposed to realize this ISP in two main steps, the first one is dedicated to the validation of refined models in the separate effect facility TOSQAN (7 m3) and at larger scale in MISTRA (100 m3) and the second one addresses the validation of codes in a complex and more realistic compartmented geometry ThAI (60 m3). Descriptions of the three experiments on which the ISP is based and the presentation of the specific test selected for the ISP are given. This work has been done with the collaboration of the CEA and GRS.

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