One problem with nuclear waste is the high volume of it because much of it is radioactive salts dissolved in water (and not heavy water...normal water). This is a good chunk of what gets buried in mountain sides.
There are ways to precipitate out the salts decreasing the volume of waste by a substantial amount as you are now burying a small brick of solid instead of a barrel of solution. There is at least one nuclear plant in Russia that uses a technology like this. The problem with the technology is the cost of the precipitate reagent and mass production of the reagent.
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