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Experimental simulation study of transition transients between forced circulation and natural circulation with reactivity feedback   CHEN Hanying1, GAO Puzhen1, TAN Sichao1, and WANG Zhongyi1   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, China (chenhanying@hrbeu.edu.cn)   Abstract: To get an insight of the transition process between natural circulation and forced circulation in nuclear power system, an experimental simulation study considering reactivity feedback was carried out. The experimental simulation of reactivity feedback process was conducted by coupling the point kinetics model with an electrically heated experimental loop. Areal-time power control system was established to simulate the nuclear reactor’s power change transients caused by the reactivity induced by temperature change. The experiment results show that: in the transition transient from forced circulation to natural circulation, the decrease of power in the initial stage of the transition can restrain the fast increase of the mean temperature of fuel; in the transition transient from natural circulation to forced circulation, enough negative reactivity should be inserted in time to avoid the power increase peak. Keyword: natural circulation;reactivity feedback; point kinetics model; neutronics-thermal- hydraulics coupling
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