Fission products behaviour in UO2 submitted to nuclear severe accident conditions

16th International Conference on X-ray Absorption Fine Structure

Geiger, E.^1 ; Bès, R.^2 ; Martin, P.^3 ; Pontillon, Y.^1 ; Solari, P.L.^4 ; Salome, M.^5

CEA/DEN/CAD/DEC/SA3C/LAMIR, St.-Paul lez Durance, France^1

Department of Applied Physics, Aalto University, Espoo, Finland^2

CEA/DEN/MaR/ DTEC/SeCA/LCC, Bagnols sur Cèze, France^3

Soleil Synchrotron, Paris, France^4

ESRF Synchrotron, Grenoble, France^5

关键词: Annealing tests;    SEM-EDS;    Severe accident;    Stable isotopes;    Thermodynamic calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012098/pdf
DOI  :  10.1088/1742-6596/712/1/012098

来源: IOP

【 摘 要 】

The objective of this work was to study the molybdenum chemistry in UO2based materials, known as SIMFUELS. These materials could be used as an alternative to irradiated nuclear fuels in the study of fission products behaviour during a nuclear severe accident. UO2samples doped with 12 stable isotopes of fission products were submitted to annealing tests in conditions representative to intermediate steps of severe accidents. Samples were characterized by SEM-EDS and XAS. It was found that Mo chemistry seems to be more complex than what is normally estimated by thermodynamic calculations: XAS spectra indicate the presence of Mo species such as metallic Mo, MoO2, MoO3and Cs2MoO4.