Simulation of experiment of water blowdown from reactor pressure vessel into reactor containment of boiling water reactor, which was performed in the Marviken experimental facility (Sweden), with the CONTAIN and ASTEC computer codes. As the Marviken facility was part of a real nuclear plant that was never commissioned, the analysis of simulation results enables a better understanding of the water (liquid water and steam) transport in the complex system of interconnected compartments on the same volume scale, as the scale of a real plant containment.
COBISS.SI-ID: 23850023
The fuel-coolant interaction may lead to an energetic steam explosion. The strength of the steam explosion is limited by melt solidification, which prevents the fine fragmentation of the melt. An improved model of the solidification influence on the fuel-coolant interaction was developed. The solidification influence modelling is strongly related to the modelling of the temperature profile and the mechanical effect of the crust on the fragmentation process. The simulation results confirmed the appropriateness of the proposed approach.
COBISS.SI-ID: 24021799
Local heat transfer and flow characteristics of an axis-symmetric impinging jet were analyzed numerically using the Reynolds average Navier-Stokes (RANS) approach and eddy viscosity type shear stress transport (SST) turbulence model. Turbulence models and heat transfer predictions were validated on a free jet impingement experiment. Since the numerical results are affected by the turbulence model, the influence of the turbulent production was investigated in particular.
COBISS.SI-ID: 23868711