Electromagnetic non-destructive testing of the graphite core in advanced gas cooled reactors.

在英国先进的气冷核反应堆（AGRs）中使用的石墨减速剂由于放射性氧化和中子轰击会随着时间的推移而降解，从而降低了砖的密度。这最终会导致裂缝的形成。该项目扩展了EDF通过分析慢化剂的电导率（与砖密度相关）来使用涡流光谱进行裂纹检测的研究。本研究的目的是研究基于涡流的新型电磁技术，用于分析电导率，特别是当探针只能从试件的一侧进入时。该技术将利用先进的信号处理和电磁反演算法，并将AGR应用作为案例研究。期望该方法可以更广泛地应用于其他对表面特性要求很高的涡流检测问题，如涂层和表面加工。

The graphite moderators used in UK's advanced gas cooled nuclear reactors (AGRs) become degraded over time due to radiolytic oxidation and neutron bombardment, reducing the density of the brick. This can eventually lead to crack formation. This project extends EDF's research in using Eddy current spectroscopy in crack detection through profiling the moderator's conductivity, which is correlated with the brick density.The aim of this research is to investigate novel electromagnetic techniques based on eddy currents for profiling electrical conductivity, especially when the probe only has access from one side of the test piece. The techniques will exploit advanced signal processing and electromagnetic inversion algorithms and will use the AGR application as a case study. It is expected that the methodology could be more broadly applied to other eddy inspection problems where surface properties are important such as coating and surface processing.