核电厂反应堆冷却剂小支管泄漏的分析与改进

Analysis and Improvement of Small Branch Pipe Leakage of Reactor Coolant in Nuclear Power Plant

核电厂压力边界的泄漏事件属于重要的安全运行事件,如何应对和处理是核电厂安全管理控制的重点。本文针对秦山核电厂300 MW核电机组压力边界的延伸支管上一个泄漏点的处理,结合机组工艺参数的演变,分析了查找泄漏点的思路和原则,以及对核电厂类似泄漏发生后的应对和处理;同时,根据根本原因分析的方法,结合美国机械工程师协会(ASME)规范的要求,分析了处理该问题的方案、依据和要点,并从设计方面和电厂日常在役检查方面提出了后续的改进建议,特别是在保证核电厂安全性的基础上,如何有效地管理小支管,提出了具体的方法,这对于现有国内外核电厂在压力边界小支管方面的管理,具有良好的借鉴应用价值。

The leakage of the pressure boundary of the nuclear power plant is an important operation event.The response and treatment after the occurrence of abnormal events is focus on the safety management of the nuclear power plant.Based on the treatment of the leak point on the extension branch pipe of the pressure boundary of 300 MW Qinshan Nuclear Power Plant,combined with the evolution of the process parameters of the unit,the ideas and principles to find the leak point are analyzed,and the response and treatment of the similar leakage in nuclear power plants are analyzed.At the same time,according to the method of root cause analysis,combined with the requirements of the American Society of Mechanical Engineers(ASME)specifications,this paper analyzes the scheme,basis and main points of solving this problem,and puts forward the subsequent improvement suggestions for the design and the daily in-service inspection.Especially the method to effectively manage the small branch pipe is proposed to ensure the safety of the nuclear power plant.It can provide a good reference for the management of pressure boundary for small branch pipes in domestic nuclear power plants.