Subsurface cracks in AGR graphite bricks

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

doi:10.1016/j.ndteint.2014.05.001

Subsurface cracks in AGR graphite bricks

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

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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 (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 language	English
Pages (from-to)	72-81
Number of pages	10
Journal	NDT and E International
Volume	66
DOIs	https://doi.org/10.1016/j.ndteint.2014.05.001
Publication status	Published - 2014

Keywords

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

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10.1016/j.ndteint.2014.05.001

POST-PEER-REVIEW-NON-PUBLISHERS.PDFAccepted author manuscript, 2 MB

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title = "Subsurface cracks in AGR graphite bricks",

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 (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. {\textcopyright} 2014 Elsevier Ltd.",

keywords = "Brick, Cracks, Eddy currents, Finite element method, Gas cooled reactors, Graphite, Nondestructive examination, Surface defects, Thermoelectricity",

author = "Fletcher, {A. D.} and Peyton, {A. J.} and D. Armitage and M. Brown and R. Chapman",

note = "The authors would like to thank EDF Energy and the UK Engineering and Physica lSciences Research Council (EPSRC) via the Nuclear EngD Programme for their support of this research.",

year = "2014",

doi = "10.1016/j.ndteint.2014.05.001",

language = "English",

volume = "66",

pages = "72--81",

journal = "NDT and E International",

issn = "0963-8695",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Subsurface cracks in AGR graphite bricks

AU - Fletcher, A. D.

AU - Peyton, A. J.

AU - Armitage, D.

AU - Brown, M.

AU - Chapman, R.

N1 - The authors would like to thank EDF Energy and the UK Engineering and Physica lSciences Research Council (EPSRC) via the Nuclear EngD Programme for their support of this research.

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - Brick

KW - Cracks

KW - Eddy currents

KW - Finite element method

KW - Gas cooled reactors

KW - Graphite

KW - Nondestructive examination

KW - Surface defects

KW - Thermoelectricity

U2 - 10.1016/j.ndteint.2014.05.001

DO - 10.1016/j.ndteint.2014.05.001

M3 - Article

SN - 0963-8695

VL - 66

SP - 72

EP - 81

JO - NDT and E International

JF - NDT and E International

ER -

Subsurface cracks in AGR graphite bricks

Abstract

Keywords

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