![]() ![]() In order to predict natural circulation stability, two different methods of analysis are developed and compared. In this paper, the study of the dynamic behaviour of single-phase natural circulation with internal heat generation for a rectangular loop is presented. Mathematical model also includes the role of passive systems and its impact on the main parameters in nuclear power plant with AP1000 reactor. Change of the few of the most important parameters, like reactor coolant temperature, medium flow or heat exchange in the refuelling water storage tank, were simulated, presented and described. In particular described phenomena concerns two above-mentioned systems, which are responsible for residual heat removal. Considerations and calculations present the role of passive safety systems in nuclear power plant. Furthermore, the paper consists thermo-hydraulic analysis of a scenario, in which power plant loss off-site power, reactor is shut-down and the active elements (especially Diesel generators) failed. Paper describes in detail the passive residual heat removal system and the passive containment cooling system in above-mentioned power plant. The paper presents operating principles of passive safety systems used in modern nuclear power plants with AP1000 reactor. The CFD results are also in agreement with a simplified 1D modeling as well as an analytical solution. It is shown that the CFD simulations adopting the k − ω SST turbulence model best reflect the experimental results. In particular, the equilibrium state of the system is investigated in terms of the mass flow dynamic behaviour and the temperature difference across the cooler section of the loop. In this work, a CFD model of the facility is set up and validated by comparing the model results to experimental data obtained during the initial testing campaign of the facility, with water as working fluid. The DYNASTY facility is designed to investigate the stability and dynamics of heat-generating fluids, in particular molten salts, in a natural or forced circulation regime and as such, it is one-of-a-kind, large scale facility for studying the natural circulation in presence of distributed heating. In this paper, CFD assessment of the DYNASTY natural circulation loop, adopting a RANS turbulence modeling approach, is performed using the OpenFOAM open source toolbox.
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