Lifetime extension of existing nuclear power plants is a foundation for sustaining low-carbon electricity supply. Reliable and cost-effective long-term operation requires detailed thermodynamic studies to detect performance degradation and inform system upgrades. This work presents a thermodynamic model of the secondary system of the Krško Nuclear Power Plant (NEK), developed in IPSEpro software environment to support such studies. The main contribution of the work is the implementation of an original model for the moisture separator and reheater (MSR), which is not explicitly represented in standard commercial libraries. The model offers a physically consistent representation of physical processes occurring in MSR supporting both one- and two-stage configurations. Verification and validation of the MSR and secondary system models were performed using operational data and NEK technical reports. Additional simulations assessed model performance under conditions representative of aging-related degradation and equipment upgrades, including steam generator tube plugging and high-pressure turbine optimizations. Results confirm the sufficient predictive accuracy of the models across a range of operating conditions.
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