Integral Large Scale Experiments on Hydrogen Combustion for Severe Accident Code Validation HYCOM

U. Bielert, W. Breitung, B. Burgeth, A. Kotchourko, W. Scholtyssek, P. Pailhories, M. Petit, E. Studer, J. Eyink, M. Movahed, K-G. Petzold, M. Heitsch, V. Alekseev, S. Dorofeev, A. Efimenko, M. Kuznetsov, M. Okun, Y. Yankin, T. Huld. FISA 2001, Luxembourg du 12 au 14 novembre 2001.

ABSTRACT The project aims at extension of the experimental data base needed for the verification of newly developed analysis methods and codes to predict hydrogen combustion behaviour and corresponding loads in complex multi-compartment geometry and on representative scale. An experimental programme in medium and large scale facilities has been performed with combustion modes, ranging from slow to fast turbulent deflagration, that were not yet covered by previous experiments. The main focus was on geometrical aspects and inhomogeneous hydrogen concentrations in dry test atmospheres and at ambient temperatures, which allowed precise definition of the initial and boundary conditions. The data base is being used for the validation of criteria, models and codes which were developed by the partners to optimise practical implementation and operating conditions of mitigation devices, and to qualify accident management measures. Blind predictive calculations were performed for selected tests with typical combustion regimes and geometries of different complexity. Comparison with post-test calculations will give valuable information on code capabilities and on the range of validity of models and code control parameters. A selected number of suitable tests will be identified for benchmarking purposes and relevant data will be made available to users outside the project. Work in collaboration with Forschungszentrum Karlsruhe, DE - Framatome ANP, DE - Gesellschaft für Anlagen- und Reaktorsicherheit, DE - Kurchatov Institute, RU - JRC Ispra, IT