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GEYSER/TONUS : A CODE FOR SEVERE ACCIDENTS CONTAINMENT ATMOSPHERE ANALYSIS
L. V. Benet
Commissariat a I'Energie Atomique, DMT/SEMT/TTMF, CE Saclay, 91191 Gif Sur Yvette Cedex, France
C. Caroli
Commissariat a I'Energie Atomique, DMT/SEMT/TTMF, CE Saclay, 91191 Gif Sur Yvette Cedex, France
P. Cornet
Commissariat a I'Energie Atomique, DMT/SEMT/TTMF, CE Saclay, 91191 Gif Sur Yvette Cedex, France
N. Coulon
Commissariat a I'Energie Atomique, DMT/SEMT/TTMF, CE Saclay, 91191 Gif Sur Yvette Cedex, France
M. Durin
Commissariat a I'Energie Atomique, DMT/SEMT/TTMF, CE Saclay, 91191 Gif Sur Yvette Cedex, France; Presently at: Commissariat a l'Energie Atomique, IPSN/DPEI, CE Fontenay, BP 6, 92265 Fontenay aux Roses Cedex, France
J. P. Magnaud
Commissariat a I'Energie Atomique, DMT/SEMT/TTMF, CE Saclay, 91191 Gif Sur Yvette Cedex, France
M. Petit
Commissariat a I'Energie Atomique, DMT/SEMT/TTMF, CE Saclay, 91191 Gif Sur Yvette Cedex, France
ABSTRACT
In many countries, the safety requirements for future light water reactors include accounting for severe accidents in the design process.
As far as the containment is concerned, mitigation features allowing to limit pressure and temperature inside the building are to be assessed. There is also a need to accurately estimate local hydrogen concentrations in order to evaluate the hydrogen risk.
For this purpose, codes have been developed in the past twenty years around the world. They generally include models for all the physical phenomena involved during severe accidents. Most of them are based on a multi-compartment approach for the spatial description. This approach has well known limitations when local concentrations must be evaluated in large volumes.
On the other hand, general purpose multi-dimensional thermal hydraulics computer codes are able to predict complex situations such as stratification occurrence, but they often lack some models which are necessary to be included in the analysis of the containment under a severe accident. The ability to treat long transients is also a concern with this type of codes.
For these reasons, CEA/DMT has undertaken the development of the GEYSER/TONUS code. This code will allow the coupling of parts of the containment described in a lumped parameter manner, together with meshed parts. Physical models of classical lumped parameter codes, such as condensation, will be adapted for the spatially described zones. The objective is to be able to treat complete scenarios and optimized numerical methods are developed for the transient problem. The code is built in the CASTEM 2000/TRIO EF system which allows, thanks to its modular conception, to construct sophisticated applications.
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