非能动安全壳冷却系统作为核电站安全系统的重要组成部分,承担着维持安全壳结构完整性和密封性的任务。本研究对摇摆条件下非能动安全壳冷却系统瞬态运行特性开展了实验研究,获得了不同摇摆参数对系统瞬态运行的影响规律。研究结果表明：摇摆条件会促进安全壳内的热量导出,最大瞬时压降速率基本不受摇摆周期和摇摆角度的影响,而平均压降速率随摇摆角度的增大或摇摆周期的减小而增大。在所研究工况范围内,冷却水温度的影响可以忽略,此外压力体内发生了热分层现象,空间高度上每增加100 mm,压力体内混合气体温度将增大约1.43℃。

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. This study conducted experimental research on the transient operation characteristics of the passive containment cooling system under swaying conditions, and obtained the influence laws of different swaying parameters on the system"s transient operation. 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 frequency, while the average pressure drop rate increases with the increase of the swaying amplitude. In the studied operating conditions, the influence of cooling water temperature can be ignored. In addition, the pressure vessel has undergone thermal stratification, and the temperature of the mixed gas in the pressure vessel will increase by about 1.43°C for every 100 mm increase in the vertical height.

TK221

国家自然科学基金重点项目(No.U2241257)