The cosCONT module within the COSINE code package is designed for containment thermal-hydraulic analysis. This study evaluates its heat transfer modeling capabilities by simulating the International Standard Problem ISP35 (NUPEC M-7-1) experiment, which investigated helium mixing and distribution under steam/helium release and dome spray conditions. The analysis focuses on key modeling factors: empirical condensation correlations, fixed heat transfer coefficients, flow resistance, spray initialization, and adiabatic boundary conditions. Results demonstrate that cosCONT effectively reproduces the overall experimental trends. The simulations exhibit a somewhat lower condensation heat removal, primarily stemming from the empirical condensation models. Imposing a fixed heat transfer coefficient leads to significant deviations by further limiting condensation, while increased flow resistance amplifies this underestimation. In contrast, results show minimal sensitivity to spray initialization or adiabatic boundaries. This work verifies the applicability of cosCONT for safety assessment and clarifies the behavior of its heat transfer models.
Chen et al. (Sun,) studied this question.