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When PWR-UO(2) fuels are irradiated at average burnups above about 40 GWd/tM, a particularly porous and fine grained microstructure, ie the so-called rim structure, develops at the pellet periphery. A thorough study of the porosity and other microstructure details within the rim and adjacent zones for a wide range of commercial PWR-UO(2) fuels is presented, together with data of the radial independence of the Vickers hardness, H(V), and the fracture toughness K(IC), for the same kind of fuels. As a complement, an evaluation of the results as function of the local burnup is given, according to calculations performed with the APPOLO code.

Additional information

Authors: SPINO J, JRC Karlsruhe (DE);COQUERELLE M, JRC Karlsruhe (DE);BARON D, EDF Etudes et Recherches, Ecuelles (FR)
Bibliographic Reference: Paper presented: IAEA Technical Committee Meeting on Advances in Pellet Technology for Improved Performance at High Burnup, Tokyo (JP), October 28-November 1, 1996
Availability: Available from (1) as Paper EN 40289 ORA
Record Number: 199710209 / Last updated on: 1997-04-01
Original language: en
Available languages: en
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