Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 538, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2020.152245
Keywords
Aluminoborosilicate glass; Nuclear waste; Chemical durability; Corrosion; Zinc; Magnesium; Calcium; Groundwater
Funding
- EPSRC Next Generation Nuclear Centre for Doctoral Training Centre [EP/L015390/1]
- EPSRC [EP/N017374/1]
- UK Department of Energy and Climate Change
- EPSRC [EP/N017374/1] Funding Source: UKRI
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Dissolution of a simulant UK nuclear waste glass containing Mg, Ca and Zn was investigated over 35 d at 50 degrees C in ultra-high quality (UHQ) water and simulant groundwater solutions. The dissolution rates were influenced subtly by the groundwater composition, following the trend, from least to most durable: clay > UHQ water > granite approximate to saline. Solutions were rapidly silica saturated but boron dissolution rates continued to increase. This is hypothesised to be due to the formation of secondary Mg-silicate precipitates, preventing the formation of a passivating silica gel layer and allowing glass dissolution to proceed at close to the maximum rate. (c) 2020 The Authors. Published by Elsevier B.V.
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