Abstract Integrated detritiation system (IDS) would play a key role in controlling the tritium release and atmosphere cleanup under accident scenarios in fusion reactors, and thus it is very significant to evaluate and ensure its reliability. Up to now, many conceptual designs for IDS have been developed worldwide, yet few are focused on its reliability studies. Due to complex redundant designs and functional dependence, this system has notable temporal failure behaviors that traditional static fault trees (SFT) are unavailable to capture and evaluate. In this contribution, motivated to understand the effect of temporal failure behaviors on reliability of IDS, dynamic fault trees (DFT) are first to be adopted to study its reliability through using dynamic binary decision tree (DBDT) approach. The results show the reliability indexes for IDS calculated by DFTs are one to two times lower than those obtained by traditional SFT, which means some overly conservative reliability requirements on IDS could be relaxed. The results also demonstrate that the DFT-based reliability evaluation method would be of great help for the fusion energy system’s optimization design in the future.

中文翻译：

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基于DBDT方法的聚变反应堆集成除杂系统可靠性评估

摘要 集成除氚系统（IDS）在聚变反应堆事故情况下控制氚释放和大气净化方面发挥着关键作用，评估和确保其可靠性具有重要意义。迄今为止，全球范围内已经开发出许多IDS的概念设计，但很少有人关注其可靠性研究。由于复杂的冗余设计和功能依赖性，该系统具有传统静态故障树（SFT）无法捕获和评估的显着时间故障行为。在本文中，为了了解时间故障行为对 IDS 可靠性的影响，首先采用动态故障树（DFT）通过动态二元决策树（DBDT）方法来研究其可靠性。结果表明，DFT计算得到的IDS可靠性指标比传统SFT计算的可靠性指标低一到两倍，这意味着对IDS一些过于保守的可靠性要求可以放宽。研究结果还表明，基于DFT的可靠性评估方法将对未来聚变能系统的优化设计有很大帮助。