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

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 mu-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)(2)Si2O7. 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.

Automated summary

The Fukushima Daiichi accident resulted in the creation of molten core-concrete interaction (MCCI) material, which is a mixture of degraded nuclear fuel material and other reactor components. Analysis of this material revealed the presence of various minerals containing U-Zr-O, as well as crystalline silicate phases and a Ce-bearing mineral called perclevite. The formation of perclevite was a result of a reaction between the U-Zr-O-depleted Ce-Nd-O melt and the silicate melt. Most of the U was found in the form of U4+, while Ce was present as Ce3+.