Title: A semi-empirical model for the formation and depletion of the high burnup structure in UO2
Authors: PIZZOCRI DAVIDECAPPIA FABIOLALUZZI LelioPASTORE GiovanniRONDINELLA VincenzoVAN UFFELEN Paul
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 487 p. 23-29
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2017
JRC N°: JRC102630
ISSN: 0022-3115
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC102630
DOI: 10.1016/j.jnucmat.2017.01.053
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.