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Conductivity Profiling of Graphite Moderator Bricks From Multifrequency Eddy Current Measurements

机译：从多频涡流测量中的石墨调节器砖的电导率分析

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摘要

This paper presents a novel system for mapping the through-wall electrical conductivity profiles of graphite moderator bricks that make up the core of an Advanced Gas-Cooled Reactor. Multi-frequency eddy current measurements were used to reconstruct the conductivity profiles as a function of depth from the bores of different graphite bricks. The study was carried out using a modified Levenberg Marquardt algorithm, along with a finite element based forward model. First, the algorithm was tested using a laboratory graphite sample with known electrical conductivity profile. Secondly, real datasets from one of the operating Advanced Gas-Cooled Reactors was collected and then used for reconstruction. The results in this study were compared with measurements from trepanned graphite samples taken from the reactor cores, and showed reasonable agreement in multiple cases, suggesting that this method could be a viable tool for non-destructively assessing the condition of the graphite core in Advanced Gas-Cooled Reactors.
机译：本文介绍了一种用于将石墨调节器砖的通壁电导率曲线绘制的新型系统，该砖块构成了先进的气体冷却反应器的核心。多频涡流测量用于重建电导率型材作为从不同石墨砖的孔的深度的函数。使用改进的Levenberg Marquardt算法进行该研究，以及基于有限元的前瞻模型。首先，使用具有已知电导率分布的实验室石墨样品来测试该算法。其次，收集来自操作的先进气体冷却反应器之一的真实数据集，然后用于重建。将该研究的结果与来自反应器核心的狭窄的石墨样品的测量进行了比较，并在多种情况下显示了合理的一致性，这表明这种方法可以是未破坏性地评估晚期天然气核心条件的可行工具 - 冷却反应器。

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