172. Theory of irradiation creep in reactor graphite — the dislocation pinning-unpinning model

✍ Scribed by B.T Kelly; A.J Foreman

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 133 KB
• Volume: 11
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(73)90508-3

✦ Synopsis

part of a joint (Dragon/KFA/Euratom/RCN) irradiation programme in the HFR Petten, The Netherlands, extensive data were obtained on the irradiation behaviour at 8 temperature levels between 400 and 1400°C of 10 different Gilsocarbon graphites. A computer technique was used to systematize and compare the data. It was tried to establish correlations of dimensional changes with initial properties to facilitate extrapolation and prediction. 168. The relation of the dimensional changes of polycrystalline graphites irradiated at 1050°C to their crystal size and structure J. W. Harrison (United Kingdom Atomic Energy Authority, Harwell, England). An attempt has been made to analyze initial crystallite dimensional change rates of a variety of polycrystailine graphites using a combination of macroscopic dimensional change measurements and thermal expansion coefficients at the irradiation temperature. The results obtained are consistent with dimensional change rates reported for pyrolytic graphites of various crystallite sizes. 169. Atomic displacement cross-sections and damage production in graphite* W. C. Morgant (Butte& Pac$ic Northwest Laboratories, Richland, Washington). Recent measurements of the energy required to displace a carbon atom from the graphite lattice, the energy lost from carbon ions by electron excitation and the latest neutron cross-sections, derived from the ENDF/B-III data file for carbon, are combined to derive a new atomic displacement function, which is used for correlating or predicting damage rates in different neutron spectra.