On the Microstructure of UO2 Pellets Irradiated at High Temperature

The microstructure of sintered UO 2 pellets irradiated at high temperature in GETR were studied. Two groups of UO 2 pellets prepared from the Mme lot were irradiated under similar thermal conditions for different periods. The effect of hurnup on the microstructure of the two groups were studied. An...

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Published inJournal of nuclear science and technology Vol. 4; no. 1; pp. 1 - 10
Main Authors TAKETANI, Kiyoaki, ICHIKAWA, Michie
Format Journal Article
LanguageEnglish
Published Tokyo Taylor & Francis Group 01.01.1967
Taylor & Francis Ltd
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Summary:The microstructure of sintered UO 2 pellets irradiated at high temperature in GETR were studied. Two groups of UO 2 pellets prepared from the Mme lot were irradiated under similar thermal conditions for different periods. The effect of hurnup on the microstructure of the two groups were studied. An extensive development of columnar grains with lenticular voids were observed in the pellets from the lower burnup group, while those from the higher burnup group had large columnar grains characterized by many radial cracks. Detailed discussion is given. Autoradiographic techniques were also applied on the specimens to examine the microstopic structure. No appreciable migration of the fission products was detected.
ISSN:0022-3131
1881-1248
DOI:10.1080/18811248.1967.9732684