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Questions concerning the correctness of the Xe concentration measured in the recrystalisation UO2 grains and the reliability of the values obtained from the width of the zone of recrystalisation in the fuel are answered. It is argued that since the Cs concentration is correct and since both Xe and Cs are determined simultaneously and under the same conditions the measured Xe concentration is also correct. In addition, experimental evidence is presented to show that EPMA provides a true indication of the zone width of recrystallisation because it detects islands of recystallised fuel that are not taken into account in the optical microscopy results so far reported. EPMA results contained in this paper show that the transition zone between normal UO2 structure and the fully developed high burn-up structure extends from about 60 to roughly 120 Gwd/tU and that the width of the zone containing recrystallised fuel increases considerably with the pellet burn-up.

Additional information

Authors: WALKER CT, ITU-Karlsruhe, Karlsruhe (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, 275 (1999) 56-62
Record Number: 200011851 / Last updated on: 2000-03-21
Original language: en
Available languages: en