二次侧非能动余热排出系统流动不稳定性研究

Analysis of Flow Instability for Advanced Secondary Passive Residual Heat Removal System

二次侧非能动余热排出(ASP)系统是压水堆核电厂应对全厂断电事故的重要措施之一。为研究ASP系统的运行特性,设计建造了ASP系统试验装置(ASPTF)。在ASPTF上开展了ASP系统运行稳定性影响试验,并对试验结果进行了理论分析。试验研究与理论分析结果表明:低压低功率下ASP系统中出现流动不稳定性;增加蒸汽管线或回水管线阻力系数可抑制ASP系统出现流动不稳定性;降低加热功率时ASP系统更易出现流动不稳定性;主泵运行状态影响ASP系统的输入功率进而影响系统的流动不稳定性。

The advanced secondary passive residual heat removal (ASP) system is one of the most important improvement measures to cope with station blackout accident in the pressurized water reator nuclear power plant. In order to obtain the operation characteristics of ASP system, the ASP system test facility (ASPTF) was constructed. The effects of different influence factors on flow instability of ASP system and theoretical analysis were obtained based on ASPTF. The experimental and theoretical results show that the flow instability of ASP system occurs in ASPTF with low system pressure and low heating power. By increasing the drag coefficient of steam pipeline or the drag coefficient of backwater pipeline, the flow instability of ASP system can be avoided. The flow instability of ASP system occurs under lower heating power conditions. The operation state of main pump influences the total inputting power of ASP system, which can further lead to the flow instability of ASP system.