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[en] Korea Hydro & Nuclear Power Co., LTD (KHNP) has been developing automatic load follow controller as a part of Advanced Power Reactor Plus (APR+) development. The developing controller is composed of three algorithms which could control reactor power and axial power shape. One is a model predictive control algorithm and another is a parameter estimation algorithm providing model predictive control algorithm with real-time reactor models and the other is a genetic algorithm in order to optimize the cost function of the controller. And various simulations on daily load follow operation were performed using this controller. This paper aimed to optimize the weighting factors based on boron concentration changes. So, we made representative scenarios of boron concentration changes which can consider xenon transient effects. And we modified load follow algorithm for optimizing the weighting factors and we evaluated the control performance improvement simulating daily load follow operation. In this study, the new selection logics for weighting factors were developed and embedded into control algorithm and its control performance was evaluated. According to the simulation results, the new selection logics improved the control performance and saved much time to find proper weighting factors. In the near future, based on this study, hardware applicability test will be performed using the load following control algorithm embedded this logic
[en] One of the challenging design goals of advanced power reactor plus (APR+) is to have daily load following capability and frequency control design features. It is well-known that highly sophisticated control algorithms are required to accomplish successful load following operations because of non-linear characteristics of core dynamics. A validation tool for the MPC was developed with the window based nuclear plant analyzer (Win-NPA). Also a test matrix was derived to cover all postulated operational modes that the MPC is expected to experience. In this paper, the features of the dynamic performance validation tool, test method and test results are presented. The validation tool of the MPC for APR+ has been developed by using Win-NPA and applied to the well-defined test cases. The performance of the MPC was evaluated to be acceptable for all test cases and, therefore, it was concluded that the newly introduced load following controller MPC can be applied to the APR+ plant. In addition to that, by the development of the validation tool for the MPC, a consistent working environment become available from the design stage of control logic to the last stage of equipment validation test, because the same set of C++ code can be applied throughout the whole engineering processes.
[en] 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.