Subsurface cracks in AGR graphite bricks |
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| Affiliation: | 1. Laboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológica (LEMIT). Calle 52 S/N. La Platan;2. Consejo Nacional de Investigación Científica y Técnica (CONICET);3. Facultad de Ciencias Naturales y Museo (FCNyM-UNLP);4. Comisión de Investigaciones Científicas (CIC) |
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| Abstract: | 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 (AGR׳s) 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. |
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| Keywords: | Eddy current Nondestructive testing Subsurface Graphite Finite element |
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