The main steam line break accident is an essential initiating event of the pressurized water reactor. In present work, the fuzzy set theory and the signal-based fault detection method has been used to detect the occurrence and diagnosis of the location and break area for the small scale MSLB. The models are validated by the AP1000 accident simulator based on MAAP5. From the test results it can be seen that the proposed approach has a rapid and proper response on accident detection and location diagnosis. The method proposed to evaluate the break area shows good performances for small scale MSLB with the relative deviation within ±3%.

中文翻译：

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小规模MSLB事故检测与诊断模型

主蒸汽管线断裂事故是压水堆必不可少的始发事件。在目前的工作中，模糊集理论和基于信号的故障检测方法已被用于小规模MSLB的位置和断裂区域的发生检测和诊断。模型通过基于 MAAP5 的 AP1000 事故模拟器进行验证。从测试结果可以看出，所提出的方法对事故检测和定位诊断具有快速和适当的响应。所提出的用于评估断裂区域的方法对于小规模 MSLB 具有良好的性能，相对偏差在 ±3% 以内。