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Abstract

Within the SARNET network of excellence in the 6th Framework Programme of the European Commission, the severe accident integral code ASTEC, jointly developed by IRSN (France) and GRS (Germany), has been validated against international experiments to evaluate the suitability and capability of new or improved models implemented in successive code versions up to V1.3rev2, delivered in December 2007. This paper focuses on the code applications concerning circuit thermal-hydraulics and core degradation to integral and separate-effect experiments: for the CESAR thermal-hydraulic module, BETHSY 9.1 b, PACTEL ISP 33 and T2.1, PMK2-SBLOCA, LOFT-LP-FP-2; for the DIVA core degradation module, CORA-13 and -W2, QUENCH-11 and -13, LOFT-LP-FP-2, Phébus FPT-4, FARO L14 and L28, LIVE-L1, OLHF-1, FOREVER EC2. Besides, the TMI-2 accident has been analyzed using the CESAR and DIVA modules in a coupling mode.
The emphasis was put on the following new or improved models: i.e. in CESAR, reflooding of an intact core, condensation in the pressurizer, sub-critical break flow correlation, and new pressurizer spray model; in DIVA, corium behaviour in the lower head and lower head mechanical failure.
For thermal-hydraulics in the circuits, good results have been obtained with ASTEC on the three integral experiments that cover various thermal-hydraulic flow regimes: LOFT-LP-FP-2 in Western PWR geometry and the two PACTEL experiments in VVER-440 geometry. These good results have been confirmed by the validation done on several BETHSY integral tests.

Additional information

Authors: BANDINI G, Ente per le Nuove Tecnologie l'Energia e l'Ambiente (ENEA), Bologna (IT);BUCK M, IKE Stuttgart University, Stuttgart (DE);HERING W, Forschungzentrum Karlsruhe (FZK) GmbH, Karlsruhe (DE);GODIN-JACQMIN L, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);RATEL G, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MATEJOVIC P, IVS, Trnava (SL);BARNAK M, IVS, Trnava (SL);PAITZ G, BUTE, Budapest (HU);STEFANOVA A, Institut for Nuclear Research and Nucler Energy (INRNE), Sofia (BG);TRÉGOURÈS N, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), St-Paul-Lez-Durance (FR);GUILLARD G, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), St-Paul-Lez-Durance (FR);KOUNDY V, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses (FR)
Bibliographic Reference: An article published in: Progress in Nuclear Energy, Volume 52, Issue 1, January 2010, Pages 148-157
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1016/j.pnucene.2009.09.008
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