Thermal-hydraulic-iodine chemistry coupling: Insights gained from the SARNET benchmark on the THAI experiments Iod-11 and Iod-12

摘要: Abstract In the SARNET2 WP8.3 THAI Benchmark capability of current accident codes to simulate iodine transport and behavior in sub-divided containments has been assessed. test Iod-11 Iod-12, made available for benchmark, distribution molecular (I2) five compartments 60 m3 vessel under stratified well mixed conditions was measured. The main processes addressed are I2 with atmospheric flows interaction steel surface. During surfaces contact containment atmosphere were dry. steam released, which condensed on walls. Nine post-test calculations conducted eight Iod-12 by seven organizations using four different codes: ASTEC-IODE (CIEMAT, GRS TUS), COCOSYS-AIM (AREVA, FZ-Julich GRS), ECART (Pisa University) MELCOR University VTT). Different nodalizations 20–65 zones applied. Generally, both tests analytical thermal-hydraulic results a fairly good agreement measurements. Only calculated local relative humidity deviates significantly from measured values all calculations. concentration gaseous phase quite diverse. Three show only minor deviations measurement, whereas others substantially concentrations. For no calculation delivers satisfactory evolution vessel. There three mediocre standing out exercise same user–code combinations. discrepancies derive various reasons discussed paper. benchmark significant user effect detected, i.e. achieved code differed considerably. This work highlights need detailed adsorption/desorption model precise modeling an accurate simulation containment, as experienced users or straight forward guidelines.