Abstract
The paper presents operating principles of passive safety systems used in modern nuclear power plants with AP1000 reactor. Paper describes in detail the passive residual heat removal system and the passive containment cooling system in above-mentioned 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. Considerations and calculations present the role of passive safety systems in nuclear power plant. In particular described phenomena concerns two above-mentioned systems, which are responsible for residual heat removal. 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. Mathematical model also includes the role of passive systems and its impact on the main parameters in nuclear power plant with AP1000 reactor.
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