4-7 November 2019
PSI Auditorium
Europe/Zurich timezone
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Multiscale modelling of cracking in CeO2 and UO2 pellets

7 Nov 2019, 11:00
20m
WHGA/001 (PSI Auditorium)

WHGA/001

PSI Auditorium

Forschungstrasse 11 5232 Villigen PSI Switzerland

Speaker

Janne Heikinheimo (VTT Technical Research Centre of Finland Ltd)

Description

High temperature and temperature gradient in nuclear fuel causes internal stresses in the structure that result fuel deformation, such as swelling, creep and cracking. These phenomena have consequences to e.g. fuel's thermal conductivity and fission gas release, which are critical safety parameters. Currently the modelling of these phenomena mainly rely on empirical correlations. This means that the models are not extendable to problems beyond the experimental data used in the derivation nor in new fuel designs. More physics oriented and universal solutions can be obtained with decreasing the time and length scales to take into account microscale phenomena and couple them to macroscopic modelling.

We present a comparative study of the cracking in CeO2 and UO2 pellets with different centre line temperatures and temperature gradients. In the comparison we apply a multiscale software called properTune [1] developed at VTT and compare the results and modelling to the INL's mesoscale fuel performance code MARMOT [2]. Both codes rely on the MOOSE framework developed at INL. Later on, we plan to compare the results with the corresponding experiments.

[1] T. Suhonen, A. Laukkanen, T. Andersson, T. Pinomaa, and K. Holmberg (2016). VTT ProperTune: Computational multiscale materials modeling concept. Web publication/site, Retrieved from http://www.match-a4m.eu/index.php/latest/news/148-propertune
[2] M.R. Tonks, D. Gaston, P.C. Millett, D. Andrs, and P. Talbot. An object-oriented finite element framework for multiphysics phase field simulations. Comp. Mat. Sci., 51(1):20–29, 2012.

Primary authors

Janne Heikinheimo (VTT Technical Research Centre of Finland Ltd) Dr Anssi Laukkanen (VTT Technical Research Centre of Finland Ltd) Dr Wade Karlsen (VTT Technical Research Centre of Finland Ltd)

Presentation Materials