Abstract The optical properties of FLiBe salt in a Fluoride-Salt-Cooled High-Temperature Reactor (FHR) present an opportunity to utilize Cerenkov radiation measurements to reconstruct the power profile in the core and detect various anomalies that could occur during operation. The Cerenkov light produced within a coolant channel is strongly correlated to the fission rate density and power level in the surrounding fuel assembly and travels freely through the optically transparent salt. The light coming from coolant channels can be measured by an array of photon detectors above the channels or a system of mirrors and light guides to a detector. This allows the assembly-level power profile in the core to be reconstructed, identifying hot spots within the core. By comparing the levels of light detected to a baseline operating state, anomalies can be detected as well as their location within the core. The method has been developed and assessed computationally to realize this approach for FHRs. Details of the method and demonstrations of its applications are discussed in this paper.

中文翻译：

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使用切伦科夫辐射的 FHR 功率分布重建和异常检测方法

摘要 FLiBe 盐在氟化物盐冷却高温反应堆 (FHR) 中的光学特性为利用切伦科夫辐射测量重建堆芯中的功率分布和检测运行期间可能发生的各种异常提供了机会。在冷却剂通道内产生的切伦科夫光与周围燃料组件中的裂变速率密度和功率水平密切相关，并且可以自由地穿过光学透明的盐。来自冷却剂通道的光可以通过通道上方的光子检测器阵列或通过反射镜和光导到检测器的系统来测量。这允许重建核心中的组件级功率分布，识别核心内的热点。通过将检测到的光强度与基线操作状态进行比较，可以检测异常及其在核心内的位置。该方法已被开发和计算评估，以实现 FHR 的这种方法。本文讨论了该方法的详细信息及其应用演示。