安全壳泄漏率在机组启动阶段的超限分析及处理

Analysis and Processing Methods of the Containment Leak Rate Alarm during the Startup Period of the NPP

简要介绍了安全壳泄漏率在线监测系统。针对多个机组在首次向功率运行的启动过程中,都出现了泄漏率高、不确定度高、DCS安全报警被触发等现象,但经实际排查后却未能发现泄漏途径的情况,通过对各机组临界期间采集数据的分析,结合监测系统的算法,对上述现象进行了分析研究,提出了在启动阶段泄漏率的计算并不准确,以及在此期间的处理建议。

The online monitoring system of containment leak rate （EPP） of nuclear power plant is introduced briefly in this paper. The monitoring system provides real-time information of the containment leak rate. During the startup period, multiple units detected high containment leak rate, high uncertainty, and leak rate alarm triggered, but eventually found no leakage spots or any leakage possibilities. This paper analyzes the data which collected during those periods, and by combined the data with real-time conditions and algorithm which being used, it proposed a conclusion that the containment leak rates during these periods are not accurate. The processing methods are also provided.