A surface-tension model was developed for the 3D two-fluid model with interface sharpening algorithm. The two-fluid model contains a pair of momentum equations for each fluid. The newly developed surface-tension model splits the surface tension force between both momentum equations.
COBISS.SI-ID: 22549799
The simulation of nuclear power plant containment sprays is part of prediction of severe accidents and of the assessment of safety systems to mitigate their consequences. To develop simulation methods, it is necessary to simulate relevant experiments, so that the selected approaches are validated. The paper describes simulations of containment spray experiments which were performed in the TOSQAN experimental facility (IRSN, France).
COBISS.SI-ID: 22491943
An analysis of ex-vessel steam explosions in a nuclear power plant was performed for different scenarios with the current version of the MC3D code. A steam explosion may develop during a severe reactor accident if the reactor vessel fails and the molten core pours in the flooded reactor cavity. The influence of the pour location, the reactor coolant system pressure, the water subcooling and the explosion triggering time on the pressure loads during a steam explosion was established.
COBISS.SI-ID: 22923303
A detailed study of the influence of grain structure size on microstructurally short cracks has been performed. In the study, we estimate a minimal length above which an engineer can treat a microstucturally short crack as being independent on the surrounding microstructural features and use classical fracture mechanics tools to evaluate it. This length has been estimated to be equivalent to 10 grain sizes. The study has been performed on a model that accounts for a larger number of randomly sized and oriented grains obtained using a Voronoi tessellation.
COBISS.SI-ID: 22559015
A new method for power system reliability analysis using the fault tree analysis approach was developed. The method is based on fault trees generated for each load point of the power system. Quantitative evaluation of the fault trees, which represents a standpoint for assessment of reliability of power delivery, enables the identification of the most important elements in the power system.
COBISS.SI-ID: 22484007