COCOSYS and ASTEC Analyses of Iodine Multi-Compartment Tests in the ThAI-Facility

摘要: Post test calculations with the accident codes COCOSYS-AIM and ASTEC-IODE were performed on iodine multi-compartment tests of German ThAI program (T hermal h ydraulics, A erosols, I odine). In transport adsorption/desorption behavior gaseous I2 measured in 60 m3 vessel a five-compartment configuration under severe conditions. The thermal hydraulic modules COCOSYS containment part ASTEC (CPA) are nearly identical but not AIM IODE. model is based data whereas IODE correlations derived from laboratory-scale used. 50-zone nodalisation was used both codes. describe qualitatively correctly concentration differences several orders magnitude periods stratified atmosphere slow homogenization convective mixed atmosphere. However, overestimate at high relative humidity. most likely reason reaction deposited to non-volatile FeI2 steel surfaces, which has been modeled sufficiently yet. Further experimental investigations facility envisaged. considering may improve future results. Nevertheless, analyses large-scale have an important validation step for demonstrating capability treatment.Copyright © 2006 by ASME