This paper presents an overview of the activities carried out in the framework of the SARNET project by the CIEMAT, INR, JRC/IE, GRS, UJV and VUJE partners involved in the validation of ASTEC on fission product (FP) release and transport experiments simulating severe accident conditions in the reactor circuit and containment. These activities were mainly devoted to the analysis of the Phébus experiments, FPT0, FPT1 and FPT2, which provided fundamental reference data for the severe accident research. The ELSA, SOPHAEROS, CPA and IODE modules were used respectively for FP release from the bundle, transport in the circuit, containment thermalhydraulics and aerosol behaviour, and finally iodine behaviour in containment. Studies on aerosol behaviour in the STORM experiments and iodine behaviour in the ThAI experiments are also summarized. The paper describes not only the results of validation of some stand-alone or several coupled code modules but also the results of first integral calculations, when all the relevant modules of the ASTEC code were used to model the fission product release and transport. In the integral calculations, no boundary conditions are to be defined by the code users for most of the code modules, but only at such interfaces were in the experiment boundary conditions were applied. The integral calculation allows to judge more objectively about the combined uncertainties of calculated results. Together with overview of the progress in the validation of main ASTEC modules, this paper also points out what are the needs for improvement of modelling in the future ASTEC V2 code versions.

AMMIRABILE Luca;  BIELIAUSKAS Arunas;  BUJAN Albert;  TOTH Bela;  GYENES Gyorgy;  DIENSTBIER Jiri;  HERRANZ Luis;  FONTANET Joan;  REINKE Nils;  RIZOIU Andrei;  JANCOVIC Juraj; 

2010-11-25

AMER NUCLEAR SOC

JRC51337

0029-5450,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC51337,