核电厂换料大修后首次点动主泵一回路压降的分析与优化  

Analysis and Optimization of Primary Circuit Pressure Drop Caused by RCP Inching for the First Time after Refueling Overhaul in Nuclear Power Plant

作　　者：李军[1] 王树强[1] Li Jun;Wang Shuqiang(Daya Bay Nuclear Power Operations and Management Co.,Ltd.,Shenzhen,Guangdong,518124,China)

机构地区：[1]大亚湾核电运营管理有限责任公司,广东深圳518124

出　　处：《核动力工程》2024年第6期226-231,共6页Nuclear Power Engineering

摘　　要：压水堆核电厂换料大修后,首次点动反应堆冷却剂泵(简称主泵)时会造成一回路压力大幅度下降,如果压力下降到技术规格书规定的运行区域以下,有主泵气蚀和轴封损坏的风险,威胁堆芯的安全。本文通过理论分析核电厂换料大修后首次点动主泵时一回路压力大幅度下降的机理,提出确定主泵的停运时机和原则、确定主泵启动顺序、设置一回路初始压力和利用一回路压力调节阀自动快速响应3个优化方法,控制压力下降幅度。实践结果表明,优化改进的点动主泵控制方法可减小一回路压力下降幅度0.2 MPa。本研究建立的优化改进的点动主泵控制方法能降低主泵气蚀和轴封损坏的风险。After the refueling overhaul of pressurized water reactor nuclear power plant,the first inching of the reactor coolant pump(RCP)will cause a significant decrease in the primary circuit pressure.If the pressure drops below the operating range specified in the technical specifications,there is a risk of RCP cavitation and shaft seal damage,which threatens the safety of the core.In this paper,the mechanism that the primary pressure drops sharply when the RCP is inched for the first time after refueling overhaul in nuclear power plant is analyzed theoretically,and three optimization methods are put forward to control the pressure drop,including determining the timing and principles for shutting down the RCP,determining the starting sequence of the RCP,setting the initial pressure of the primary circuit and using the primary pressure regulating valve to automatically respond quickly.The practical results show that the optimized and improved control method for the inching of RCP can reduce the pressure drop in the primary circuit by 0.2 MPa.The optimized and improved control method of inching RCP established in this study can reduce the risk of cavitation and shaft seal damage of RCP.

关 键 词：主泵 点动 压力下降 控制方法 

分 类 号：TL334[核科学技术—核技术及应用]