核电厂化容系统上充回路可靠性研究

Research on the Reliability of the Charging Circuit of the Chemical Capacity System in Nuclear Power Plants

目的:研究旨在分析核电厂化容系统上充回路的可靠性,预测设备故障率,并提出改进措施以提高系统稳定性和安全性。方法:通过构建故障树模型对上充过程子功能潜在的故障原因进行系统分析,使用仿真软件模拟各种故障情景,并测试不同运行功率下反应堆性能,以及容控、阀门和上充泵的故障率。结果:实验结果表明,在600MW功率下,冷却剂流量约21 000 m^(3)/h时,冷却剂压降达到最大值27.6 k Pa。容控设备故障率随运行时间增加迅速,90 h使用后达0.3;上充泵初期故障风险高,长时间使用故障率接近0.2。结论:核电厂化容系统上充回路的可靠性受多个组件故障率的影响,通过定期监测和维护关键组件、加强管道清洁维护、备份电源供应,可以显著降低故障率。

Purpose:The study aims to analyze the reliability of the charging circuit in the chemical capacity system of nuclear power plants,predict equipment failure rates,and propose improvement measures to improve system stability and safety.Method:A fault tree model was constructed to systematically analyze the potential fault causes of the sub functions during the charging process.Simulation software was used to simulate various fault scenarios,and reactor performance was tested under different operating powers,as well as the failure rates of capacity control,valves,and charging pumps.Result:The experimental results show that at a power of 600MW and a coolant flow rate of about 21000m~3/h,the coolant pressure drop reaches the maximum value of 27.6k Pa.The failure rate of capacity control equipment increases rapidly with running time,reaching 0.3 after 90 hours of use;The early failure risk of the charging pump is high,and the failure rate after long-term use is close to 0.2.Conclusion:The reliability of the charging circuit in the chemical capacity system of nuclear power plants is affected by the failure rate of multiple components.By regularly monitoring and maintaining key components,strengthening pipeline cleaning and maintenance,and backup power supply,the failure rate can be significantly reduced.