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ESCADRE MODO AND RALOC MOD2 ASSESSMENT MAJOR FINDINGS AND RELEVANCE TO THE SAFETY OF LWRS

DOI: 10.1615/ICHMT.1995.RadTransfProcHeatMassTransfSevNuclReactAcc.470

C. Renault
Institut de Protection et de Sûreté Nucléaire (IPSN) du CEA - Cadarache (France)

A. Mailliat
Institut de Protection et de Sûreté Nucléaire (IPSN) du CEA - Cadarache (France)

B. Schwinges
Gesellschaft für Anlagen und Reaktorsicherheit (GRS) mbH - Köln (Germany)

Resumo

ESCADRE is a set of specialized codes each one dealing with a particular aspect of the severe accident phenomenological domain for LWRs, from core uncovery up to radioactive release out of the containment. Recently, these codes have been linked to each other into a self-standing integral code. RALOC is a thermal-hydraulic code for the simulation of containment behaviour, including multicompartment thermal-hydraulics and hydrogen burning/deflagration. The implementation of version mod2 into ESCADRE is under progress.
ESCADRE and RALOC have been extensively validated against a large set of experiments. A substantial amount of results have been obtained in the field of fission product release and retention in the reactor coolant system, containment threat due to hydrogen burning, fission product depletion in the containment, containment melt-through due to molten core concrete interaction, contribution of volatile iodine species to source term.
This paper is a review of the most significant outcomes from this validation work with regard to the relevance to the evaluation of source term and containment integrity for LWRs.

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