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Notes on the two-phase model for radiation-induced dimensional changes in graphite

✍ Scribed by W.C. Morgan

Publisher
Elsevier Science
Year
1966
Tongue
English
Weight
780 KB
Volume
4
Category
Article
ISSN
0008-6223

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✦ Synopsis

The historical development and modifications to the "single-phase model" of the graphite structure, used to interpret and predict behavior during neutron irradiation, are outlined. In the singlephase mode1 all parts of the artificial graphite aggregate are assumed to behave as if they were part of a graphite crystal lattice. It is shown that changes occurring in the non-graphitic carbon phase, relief of internal stresses induced during cool-down from graphitization temperature, and changes in the crack structure of the graphite aggregate must also be considered in interpretation of dimensional changes produced during high-temperature irradiations.

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When graphite is employed as a reactor moderator, the variations of temperature and neutron flux within the moderator bars cause internal stresses to be generated in the graphite. The effect of these stresses on the dimensional changes of the graphite are of immediate interest in the field of reacto