Swedish Advanced Lead Reactor – passively safe lead-cooled reactor (leadcold.com)

"residual high level waste (mainly short lived fission products) will be vitrified and isolated from the biosphere in a geological repository"

A little known fact..

there is not enough of the appropriate geological strata in the world for the disposal of the whole worlds vitrified waste material.

Sorry no references.. the book with the references is roughly 245km away from me at the moment