[3F09-14] Severe Accident Analysis

[3F14] CIGMA experiment on thermal hydraulic behavior in a containment vessel during a severe accident

(3)Numerical Simulation of a Buoyant Heated Air Jet in Large Containment Vessel CIGMA with Outer Surface Cooling

*Ari Hamdani¹, Satoshi Abe¹, Masahiro Ishigaki¹, Yasuteru Sibamoto¹, Taisuke Yonomoto¹ (1. JAEA)

Keywords:Computational Fluid Dynamics, Buoyant jet, CIGMA, Thermal stratification, Nuclear containment vessel

Gas density stratification build-up and its propagation/erosion, which is regarded as a benchmark of hydrogen behavior in a severe accident, were experimentally and numerically studied by using buoyant jet in the containment vessel. The experiments were conducted with external surface cooling and various air jet inlet temperatures up to 435 °C. The CFD simulation was also performed, and the data on temperature and velocity profile were used for the validation.