The ESCADRE code system (Ensemble de Systemes de Codes d'Analyse d'accident Des Reacteurs à Eau) has been designed for the evaluation of the response of nuclear plants during hypothetical severe accidents.In the last few years, it has been extensively used in France but also in Eastern countries such as Russia, Slovakia, Bulgaria, Czech Republic , Hungary, China, etc.. A new release, ESCADRE mod1.2, will be delivered in June 1998. All modules of this new release are here briefly described as well as some of the results of the validation work. Experiments from the BETA series at ZfK Karlsruhe, PHEBUS at Cadarache, LACE at Hanford, PHEBUS/RTF at Whiteshell, ANL-U series at Argonne, HEVA-6 and VERCORS-1 at Grenoble and FALCON 18 at Winfrith, have been studied and simulated by means of the ESCADRE codes.The ESCADRE system, simulating the accident from core degradation up to fission product/aerosol release out of the containment, allows the user to run the codes in a stand-alone or in a coupled mode. ESCADRE codes refer to the in-vessel/primary system accident phase (VULCAIN, ELSA, SOPHAEROS) and to the ex-vessel/containment accident phase (RUPUICUV, WECHSL, IODE, JERICHO and AEROSOLS-B2).Safety systems are modelled by the SYSINT module.
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