摇摆条件下非能动安全壳冷却系统瞬态运行特性实验研究

The passive containment cooling system, as an important part of the nuclear power plant safety system, is responsible for maintaining the integrity and sealing of the containment structure. The experimental research on the transient operation characteristics of the passive containment cooling system under swaying conditions was conducted, and the influence laws of different swaying parameters on the system′s transient operation were obtained under the conditions of 0. 6 - 1 MPa mixture gas pressures, 25 - 40 ℃ cooling water temperatures, 15% - 30% air mass fractures, 0° - 10° swaying angles and 0 - 2 s swaying periods. The research results show that swaying conditions promote heat dissipation in the containment, and the maximum instantaneous pressure drop rate is basically unaffected by the swaying period and angle, while the average pressure drop rate increases with the increase of the swaying angle or the reduction of the swaying period. In the studied operating condition range, the influence of cooling water temperature on transient operation of system can be ignored. In addition, the pressure vessel has undergone thermal stratification, and the temperature of the mixture gas in the pressure vessel increases by about 1. 43 ℃ for every 100 mm increase in the spacial height.