ASTEC, COCOSYS, and LIRIC Interpretation of the Iodine Behavior in the Large-Scale THAI Test Iod-9

摘要: The large-scale iodine test Iod-9 of the German Thermal hydraulics, Hydrogen, Aerosols, Iodine (THAI) program was jointly interpreted by means post-test analyses within THAI Circle Severe Accident Research NETwork (SARNET)/Work Package 16. In this test, molecular (I 2 ) injected into vessel dome 60 m 3 to observe evolution its distribution between water, gas, and surfaces. main processes addressed in are (a) mass transfer I gas two sumps, (b) transport sump when it is stratified then mixed, (c) adsorption onto, desorption from, walls presence absence wall condensation. codes applied partners were Source Term Evaluation Code (ASTEC)-IODE (IRSN, Saint Paul Lez Durance, France), Containment System (COCOSYS)-Advanced Model (AIM) (GRS, Garching, Germany), Library Reactions (LIRIC; AECL, Chalk River, ON, Canada). ASTEC-IODE Advanced semi-empirical models integrated lumped-parameter ASTEC COCOSYS, respectively. With both multicompartment calculations can be performed. LIRIC a mechanistic model for single stand-alone calculations. simulation results compared with each other experimental measurements. Special issues that encountered during work studied more details: diffusion reaction steel gaseous aqueous phases, from sump. behavior fairly well simulated ASTEC-IODE, COCOSYS-AIM, measured understood all data found consistent. very slow COCOSYS only, qualitative way. Consequently, highlighted need improve modeling wet washdown walls, sump, /steel phases. any case, analysis has been an important validation step applied.