摘要

In the safety water injection system of an advanced nuclear power plant, steam is injected onto water inside a tank called hybrid SIT. Depending on the condensation rate of steam and the rise time of pressure inside the tank, the performance of the system is determined. To understand the phenomena, an experiment with visualization as well as finely installed instrumentation was conducted. In parallel, simulation of the steam jet development and subsequent condensation was performed using a CFD code, STAR-CCM+. Each phenomenon was validated first by comparing with existing experiments; then, simulation on our hybrid SIT experiment was conducted. In the simulation, three domains of (steam and air), water, and wall were considered. As a result, pressure and temperature trends were compared between experiments and simulation. The sensitivity of the condensation model was identified.