## Abstmd-Irradiation creep in reactor graphite is normally taken to be linear visco-elastic in character, but modified by any structural changes in the graphite, such as those due to radiolytic oxidation or dimensional changes. Corrections for these changes are made to the creep rate using the we
70. Some studies on irradiation creep of graphite
β Scribed by J.E Brocklehurst; R.G Brown
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 137 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
214
ABSTRACTS height, layer spacing and anisotropy were measured. Significant increases in preferred orientation resulted from irradiation at temperatures above 1100Β°C. The crystallite dimensional changes were derived from the measured dimensional changes and the preferred orientations. Comparison of the results with previously published data for carbons and graphites shows that at irradiation temperatures below N 500Β°C the crystallite dimensional change rates show no dependence on crystallite size and decrease with increasing irradiation temperature. Above N 500Β°C dimensional change rates increase with increasing temperature and are higher for carbons with smaller crystallite sizes.
π SIMILAR VOLUMES
The phenomenon of irradiation creep in graphite is essential to the design and construction of graphite-moderated reactors. Recent experimental results have shown large apparent reductions in creep rate for creep strains greater than ?I'%. It is shown that this is not a true reduction in creep rate,
An experiment is described in which the irradiation induced creep extensions of helical springs under constant load are recorded continuously at various controlled temperatures between 70 and 350Β°C. The load can be adjusted without removing the rig. Some resuhs are reported for specimens of graphiti
The small angle scattering from a number of graphites which had been neutron irradiated at 1050Β°C to doses up to 5 X 10" n.cm-\* (Dido Nickel Equivalent) has been studied. Irradiation results in a decrease in the number of pores and regions of disorder whose radius of gyration is -100 A and an incre
ru &&or@, C&ze#z, Warrington, Lams., EngZand). Most polycrystalline graphites exhibit volume shrinkage when they are irradiated at high temperatures. For temperatures up to about 1100Β°C the rate of volume shrinkage appears to have a maximum at about 400Β°C. For a further understanding of the mechanis