Due to the importance of the reactor protection system (RPS) safety function in nuclear power plants (NPPs), its reliability analysis is one of the essential parts of the probabilistic safety assessment (PSA) of any NPP. The dynamic fault tree (DFT) technique extends the conventional static fault tree (SFT) by considering the time requirements to model and evaluate the NPP safety. This study develops the DFT model for RPS to achieve a more realistic and accurate representation of the RPS safety analysis taking into consideration the change in k-out-of-n logic during operation due to test and maintenance (T&M) of any channel. Also, it shows the efficiency of the DFT model over the SFT model with respect to the accuracy, complexity, and calculation time which makes it a useful tool to assess the unavailability of RPS and design a proper maintenance program.

中文翻译：

---

反应堆保护系统动态故障树模型的开发

由于核电厂（NPP）中反应堆保护系统（RPS）安全功能的重要性，其可靠性分析是任何NPP概率安全评估（PSA）的重要组成部分之一。动态故障树（DFT）技术通过考虑建模和评估NPP安全性所需的时间，扩展了常规的静态故障树（SFT）。这项研究开发了RPS的DFT模型，以考虑到任何通道的测试和维护（T＆M）操作过程中k-out-n-n逻辑的变化，从而实现RPS安全分析的更真实和准确的表示。此外，相对于SFT模型，它在准确性，复杂性，