Molybdenum release from high burnup spent nuclear fuel at alkaline and hyperalkaline pH

The present work shows experimental data on the release of some radionuclides that are forming the so-called ε particles in the spent nuclear fuel (SNF): Mo, Tc, Ru and Rh. The leaching experiments were carried out with a 60 GWd·t−1 burnup SNF at two different pH values, 8.4 and 13.2, and under oxidizing conditions. The modelling of the data showed that the higher release of Mo, Tc, Ru and Rh at pH 13.2 could be due to the higher dissolution rate of the ε-particles. Graphical abstract

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Characterisation of high burnup spent mixed oxide fuel after leaching at hyperalkaline pH in a reducing environment

Schreinemachers,

Leinders,

Van Eyken

et al. 2024

MRS Advances

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Microstructural investigations of a Zircaloy-4 clad mixed oxide fuel rod segment with a burnup of 50.3 GWd/tHM after exposure to a synthetic young cementitious water at a hyperalkaline pH of 13.7(2) under reducing atmosphere for about 3.5 years were conducted. A deposit on surfaces exposed to the leachate was observed and attempts were made to identify its composition. Initial scanning electron microscopy/energy dispersive X-ray spectroscopy results indicate that it contains several leachate constituents, as well as Zr and Ti. The presence of Ti indicates corrosion of the autoclave liner during the leaching experiment. Surfaces which were not directly exposed to the leachate revealed additional features, such as distinct ε-particles. Remarkably, these could not be identified on surfaces exposed to the leachate, which may indicate that dissolution of the ε-particles took place as well. Graphical abstract

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Molybdenum release from high burnup spent nuclear fuel at alkaline and hyperalkaline pH

Cited by 3 publications

References 29 publications

Release of Cs, Sr and Rb from two high–burnup spent nuclear fuels: Effect of the dishing and the internal grain boundaries

Release of Cs, Sr and Rb from two high–burnup spent nuclear fuels: Effect of the dishing and the internal grain boundaries

Modelling the release of Mo, Tc, Ru and Rh from high burnup spent nuclear fuel at alkaline and hyperalkaline pH

Characterisation of high burnup spent mixed oxide fuel after leaching at hyperalkaline pH in a reducing environment

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