Engineering and Technology

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

H. Ding, C. Gausse, et al.

Delve into the intriguing world of molten core-concrete interaction as researchers, including Hao Ding and Clémence Gausse, unveil new findings about U-Zr-O minerals and their reactive transformations. This study showcases how unique phases influence oxidation states, shedding light on the complexities of nuclear material behavior in reducing conditions.

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Playback language: English

Index

Abstract

Simulant molten core-concrete interaction (MCCI) material, excluding highly radioactive fission products, was synthesized using depleted U and Ce as a Pu surrogate. μ-focus X-ray analysis revealed U-Zr-O minerals, CaSiO₃, SiO₂-cristobalite, and Ce-bearing percleveite, (Ce,Nd)₂Si₂O₇. Perclevite formed from the reaction between the U-Zr-O-depleted Ce-Nd-O melt and the silicate melt. U was primarily U⁴⁺, while Ce was Ce³⁺, consistent with reducing synthesis conditions. Various Fe-containing phases with different oxidation states were identified, potentially influencing Ce oxidation state heterogeneity.

Publisher

npj Materials Degradation

Published On

Feb 02, 2022

Authors

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

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