Assessment and improvement of numerical model for steam condensation with non-condensable gases on all-curvature surfaces in NPP containments

Steam condensation with non-condensable gases is one of the most important phenomena in containment of nuclear power plant (NPP) after accidents. With the application of passive containment cooling system (PCCS), steam is condensed on surfaces with different curvatures of PCCS and structures. Previous investigations indicated the need for suction corrections in the diffusion boundary layer model of steam condensation in the presence of non-condensable gases. By implanting different suction effect corrections in OpenFOAM, this study found that existing suction effect corrections cannot make good predictions for steam condensation with noncondensable gases on varied curvature surfaces, which resulted from cases lack of diversity. Thus, a new correction was proposed based on Gasthof number and previously corrections. This correction was validated by data sets from TOSQAN, COAST, Dehbi and Su's facilities. The relative deviations of 90.0 % simulation results based on the new correction from the experimental results were within 20.0 %.