Chemical characterisation of degraded nuclear fuel analogues simulating the Fukushima Daiichi nuclear accident

Ding, Hao; Gausse, Clémence; Wilkins, Malin C.Dixon; Mottram, Lucy M.; Stennett, Martin C.; Grolimund, Daniel; Tappero, Ryan; Nicholas, Sarah; Sun, Shikuan; Shiba, Tomooki; Paraskevoulakos, C.; Hyatt, Neil C.; Corkhill, Claire L.

doi:10.1038/s41529-022-00219-3

Chemical characterisation of degraded nuclear fuel analogues simulating the Fukushima Daiichi nuclear accident

Ding H, Gausse C, Wilkins MCD, Mottram LM, Stennett MC, Grolimund D, Tappero R, Nicholas S, Sun S, Shiba T, Paraskevoulakos C, Hyatt NC & Corkhill CL

Citation

Ding, H., Gausse, C., Wilkins, M. C. D., Mottram, L. M., Stennett, M. C., Grolimund, D., … Corkhill, C. L. (2022). Chemical characterisation of degraded nuclear fuel analogues simulating the Fukushima Daiichi nuclear accident. npj Materials Degradation, 6, 10 (13 pp.). https://doi.org/10.1038/s41529-022-00219-3

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:40958

The Fukushima Daiichi accident generated degraded nuclear fuel material, mixed with other reactor components, known as molten core-concrete interaction (MCCI) material. Simulant MCCI material was synthesised, excluding highly radioactive fission products, containing depleted U, and incorporating Ce as a surrogate for Pu. Multi-modal µ-focus X-ray analysis revealed the presence of the expected suite of U-Zr-O containing minerals, in addition to crystalline silicate phases CaSiO₃, SiO₂-cristobalite and Ce-bearing percleveite, (Ce,Nd)₂Si₂O₇. The formation of perclevite resulted from reaction between the U-Zr-O-depleted Ce-Nd-O melt and the silicate (SiO₂) melt. It was determined that the majority of U was present as U⁴⁺, whereas Ce was observed to be present as Ce³⁺, consistent with the highly reducing synthesis conditions. A range of Fe-containing phases characterised by different average oxidation states were identified, and it is hypothesised that their formation induced heterogeneity in the local oxygen potential, influencing the oxidation state of Ce.