Pipelines in nuclear power plants can be subject to the phenomenon of thermal stratification of water, which causes a high temperature gradient along the height of the pipe. This creates thermal loads that were not taken into account in the design of many power plants. In the master's thesis, the example of the pipeline under consideration is first reconstructed with detailed individual flow and thermo-mechanical analyses. Then, the influence of the geometric parameters of the pipe on the mechanical response due to thermal stratification of superheated water is discussed. Flow analyses were performed in the Ansys Fluent software
environment, and then thermo-mechanical analyses were performed in the Abaqus software environment with the exported temperature field of the pipe. By comparing the final results of individual pipes, it was found that pipes of greater length and diameter or smaller thickness are most plastically deformed due to thermal stratification.
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