Subsurface cracks in AGR graphite bricks

A. D. Fletcher, A. J. Peyton, D. Armitage, M. Brown, R. Chapman

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    Sub-surface cracks present difficulties for eddy current methods as the skin effect causes currents to flow preferentially near the surface. This work examines graphite as a case study for the qualitative assessment of sub-surface cracks and employs multi-frequency eddy current techniques. The research has particular relevance to Advanced Gas-Cooled Reactors (AGRs) as during their operation there is the potential for cracks to develop within moderator bricks. This work reports that subsurface slots of 18% brick thickness can be detected. This work confirms these results with a parametric 3D finite element study. © 2014 Elsevier Ltd.
    Original languageEnglish
    Pages (from-to)72-81
    Number of pages10
    JournalNDT and E International
    Publication statusPublished - 2014


    • Brick
    • Cracks
    • Eddy currents
    • Finite element method
    • Gas cooled reactors
    • Graphite
    • Nondestructive examination
    • Surface defects
    • Thermoelectricity


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