A method for determining film flow coverage for the AP600 passive containment cooling system

An analytical model has been developed to predict the stability behavior of a thin film of water flowing over heated and unheated surfaces. The surface consists of a steel shell in the shape of an elliptical dome, which extends down to form cylindrical walls. The surface of the shell is coated to resist corrosion and enhance the surface wettability. The model is compared to observed test data and is used to predict the wetting behavior of the AP600 passive containment cooling system (PCS).