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Abstract

High burn-up extension of L WR fuel is progressing to reduce the total process flow and eventually the costs of the nuclear fuel cycle. However, a particular fuel restructuring appearing at high burn-ups at the periphery of LWR UO2-fuel pellets, but also in the Pu-rich clusters of the MOX fuels and to some extent in FBR fuels, motivates concern due to its possible contribution to the total fission gas release (FGR). The structure modifications of the fuel in this so-called rim-zone are characterised by a considerable increase of the local porosity and a subdivision of the original matrix grains. Both effects are assumed to impact negatively the FGR behaviour of the fuel, the first through an undeniable elevation of the fuel temperatures by deterioration of the thermal conductivity and the second by a potential enhancement of the gas out-channelling through the new created boundaries.

Additional information

Authors: SPINO J, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);PAPAIONNOU D, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);RAY I, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);BARON D, EDF Etudes et Recherches (FR)
Bibliographic Reference: An oral report given at: The International Seminar on Fission Gas Behaviour in Water Reactor Fuels. Held at: Cadarache (FR) 26-29 September 2000
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