In order to get a better analysis of the thermal hydraulic phenomena related to steam jets in AP1000 containment, a model based on the actual AP1000 containment size has been used to simulate the steam jet injection at different positions with different velocities of the containment. ANSYS CFX is used to get the temperature profiles of the ambient fluid. From the results of the simulation, stratification can be expected in the gas spaces of the containment, because the temperature only changes along with the vertical height, due to the heat or mass transfer processes between the air and the steam jets. It can be predicted that the hot air rises and eventually stratification forms, with lighter air overlying the heavier air. In this paper, strong and weak steam jet injections have been both simulated by ANSYS CFX, however, it turned out that stable stratification phenomena can only be found in weak steam jet injections, strong injections can’t form obvious stratification. This is very important for the design and operation of AP1000 containment, and can help us to study the long-term containment behavior during LOCAs.

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