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Modeling of natural circulation system with and without reactivity feedback CHEN Xianbing, and GAO Puzhen1   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, PR China (gaopuzhen@hrbeu.edu.cn)   Abstract:A nuclear power simulation system is model with reactivity feedback taking into consideration. The power feedback algorithm is developed by representing reactor dynamic with a point reactor model. Homogeneous flow model is used to predict thermal-hydraulic behavior in the natural circulation loop. The governing equations of mass, momentum and energy coupled with point reactor model are discretized and solved. Simulation of natural circulation system is carried out with and without reactivity feedback. Numerical results on flow instability with different amplitudes and periods are found and compared with experimental data. The transient behavior of power step is analyzed under reactivity feedback mode. Reactivity feedback is found to have a significant influence on natural circulation transient. Keyword: natural circulation; reactivity feedback;thermal-hydraulic; point reactor model; flow instability
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