Please use this identifier to cite or link to this item:
|Title:||A semi-empirical model for the formation and depletion of the high burnup structure in UO2|
|Authors:||PIZZOCRI DAVIDE; CAPPIA FABIOLA; LUZZI Lelio; PASTORE Giovanni; RONDINELLA Vincenzo; VAN UFFELEN Paul|
|Citation:||JOURNAL OF NUCLEAR MATERIALS vol. 487 p. 23-29|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in periodicals and books|
|Abstract:||In the rim zone of UO2 nuclear fuel pellets, the combination of high burnup and low temperature drives a microstructural change, leading to the formation of the high burnup structure (HBS). In this work, we propose a semi-empirical model to describe the formation of the HBS, which embraces the polygonisation/recrystallization process and the depletion of intra-granular fission gas, describing them as inherently related. For this purpose, we per-formed grain-size measurements on samples at radial positions in which the restructuring was incomplete. Based on these new experimental data, we assume an exponential reduction of the average grain size with local effective burnup, paired with a simultaneous depletion of intra-granular fission gas driven by diffusion. The comparison with currently used models indicates the applicability of the herein developed model within integral fuel performance codes.|
|JRC Directorate:||Nuclear Safety and Security|
Files in This Item:
There are no files associated with this item.
Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.