Abstract
ABSTRACTA carbon steel container including nuclear glass has been altered for 2 years in Andra’s Underground Research Laboratory to simulate the behaviour of waste package. Post-mortem analyses at different scales (macro–micro–nano) have been performed to identify neoformed phases on iron corrosion products (ICP) and in the glass alteration layer (GAL). It has been shown at nanometric scale that important quantities of iron and silicon were found in the GAL and in the ICP respectively. Using a comparative approach with phyllosilicate references, STXM, at Si-K edge, suggests presence of trioctahedral species in the GAL and in ICP. Relevant fits of the STXM spectra are obtained with a Fe-rich chlorite for the nanostructured GAL, which could be formed according to chloritisation mechanism.This paper is part of a supplement on the 6th International Workshop on Long-Term Prediction of Corrosion Damage in Nuclear Waste Systems.
Highlights
In the context of nuclear waste management, several strategies propose to confine high level radioactive waste (HLW) in a deep geological disposal
The elemental composition of the pristine glass (PG), the glass alteration layer (GAL) and iron corrosion products (ICP) was analysed by energy-dispersive X-ray (EDX) (Figure 3)
Constant thickness of GAL suggests that the water is present everywhere in the container and that the distance from the source of the iron does not influence the dissolution kinetics of the PG
Summary
In the context of nuclear waste management, several strategies propose to confine high level radioactive waste (HLW) in a deep geological disposal. After burial of HLW and complete resaturation of the host rock, water will arrive to the near field, corrode the carbon steel overpack and induce glass hydrolysis. The near field is usually the seat of thermal, hydraulic, mechanical and chemical disturbances induced by the presence of nuclear waste’. Alteration of these two materials, the nuclear glass and the carbon steel overpack, have been studied separately for decades and more recently several studies have shown that the combined impairment of iron and glass can lead to a more intense alteration of the glass [3]. That is why the iron-silicate species have to be identified and characterised to add important data for the glass–iron alteration model
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