This thesis examines the secondary side of a pressurised water nuclear power plant. A thermodynamic model of the secondary circuit is developed in the Python programming environment. The model includes steam generators, the turbine train, regenerative feedwater heaters, the condenser, and the connection to the tertiary river and cooling tower system. Model calculations are used to generate h–s and T–s diagrams of the steam cycle. The main integral operating parameters of the secondary system, including net power output and efficiency, are determined. The influence of cooling water temperature and condenser pressure on plant power and secondary cycle efficiency is analysed. Plant operation in the period 2020–2023 is further assessed using hydrological and meteorological data. The results show that higher ambient temperatures and reduced cooling water flow lead to a reduction in electrical output. Cooling tower operation contributes significantly to this power
decrease. The analysis confirms that ambient conditions strongly affect secondary cycle performance and that the system responds nonlinearly to changes in operating conditions.
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