A numerical method for thermal hydraulic phenomena in a hemispherical narrow gap flow passage was developed to evaluate a cooling capability with gap formation between the molten core and the reactor pressure vessel. The gap cooling mechanism was modeled as gas-liquid two-phase flow in the narrow gap with two-dimensional spherical coordinate system. The analytical model is based on a modified drift flux model for multi-dimensional two-phase flow analysis. Numerical results showed that liquid phase intrusion into the gap in the counter direction of gas phase upward flow kept down a rise of void fraction as gap cooling phenomena. Under the high heat flux condition, expansion of the high void fraction region due to the counter-current flow limitation was reproduced as a dryout phenomenon. Characteristics of gap cooling limitation predicted by the numerical analyses were verified by comparison with various experimental data and correlations of critical heat flux.
|出版ステータス||出版済み - 10 19 2002|
|イベント||10th International Conference on Nuclear Engineering (ICONE 10) - Arlington, VA, 米国|
継続期間: 4 14 2002 → 4 18 2002
|その他||10th International Conference on Nuclear Engineering (ICONE 10)|
|Period||4/14/02 → 4/18/02|
All Science Journal Classification (ASJC) codes