Abstract
The compositions of borosilicate glasses used to solidify fission product solutions are selected for their low leach rates. Fracturing of the glass blocks, caused primarily by thermal and residual stresses during cooling, increases the potential leaching surface area and the number of small particles, both of which are undesirable since long term container failure must be considered. It is therefore important to know the state of fracture of the glass occurring at different stages of its thermal history. A theoretical appraisal of the fracture state of the glass is presented, complimented by an experimental study using industrial scale glass blocks under realistic thermal conditions.
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