Analysis of Static Flow Excursion in Natural Circulation Using CATHARE Code

This paper based on the characteristic of the static flow excursion under middle and low pressure condition, proposed the research results. CATHARE code was adopted for simulation of the natural circulation system, while different parameters such pressure and resistance positions were taken into account, looking for the influence factors. The results show that lower pressure easily lead to static flow excursion, as well as the higher resistance in the outlet of heater domain. Resistance distribution in the outlet of the heater section made a great impact for the whole natural circulation system. Besides, characteristics of static bifurcation and hysteresis effect are given in this paper.