Irradiation induced dimensional changes in bulk graphite: The theory

Based on experimental data on irradiation-induced deformation of graphite, we introduce a concept of diffuse domain structure developed in reactor graphite produced by extrusion. Such domains are considered as random continuous deviations of local graphite texture from the global one. We elucidate t...

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Bibliographic Details
Published in:Journal of nuclear materials 2013-08, Vol.439 (1-3), p.72-83
Main Authors: Panyukov, S.V., Subbotin, A.V., Arzhakov, M.V.
Format: Article
Language:English
Subjects:
Graphite
Irradiation
Nuclear engineering
Nuclear power generation
Nuclear reactor components
Nuclear reactors
Surface layer
Texture
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Summary:Based on experimental data on irradiation-induced deformation of graphite, we introduce a concept of diffuse domain structure developed in reactor graphite produced by extrusion. Such domains are considered as random continuous deviations of local graphite texture from the global one. We elucidate the origin of domain structure and estimate the size and the degree of orientational ordering of these domains. Using this concept we explain the well known radiation-induced size effect observed in reactor graphite. We also propose a method for converting the experimental data on shape-change of finite-size samples to bulk graphite. This method gives a more accurate evaluation of corresponding data used in estimations of reactor graphite components’ lifetime under irradiation.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2013.03.070