Evaluation of Extended Daily Load Following Operation Capability for APR+ with Model Predictive Controller

The reactor power follows a daily load cycle of 100- 50-100%, 14-2-6-2 hour pattern which is typical daily load following operation. The range of extended daily load following operation was decided to 100-20-100% power change conservatively more than the requirement of UK EPR that load follow can be activated between 25% and 100%. In this paper, the extended daily load following operation followed 100-20-100%, 14-2-6-2 hour pattern which was evaluated for the APR+ with the model predictive controller with the adjustment of boron concentration change. In this paper, the capability of extended daily load following operation, 100-20-100%, 14-2-6-2 hour pattern, was evaluated for APR+ using the MPC with boron concentration change. Dilution rate is one of the limiting factors at EOC because the dilution rate is decreasing as the boron concentration is decreasing. Dilution rate of 40 ppm/hr is required for extended load following operating and this valve approximately corresponds to 80% EOC.