In reply to Andy Hay: It seems like a very reasonable proposal, relative to just leaving all our nuclear waste rotting in flasks on the cumbrian coast.
Eventually we're going to need to sort out a repository for HLW somewhere... and it's likely to be in a mountainous region due to the geological requirements. The lakes has the added factor of anestablished base of experience in all things nuclear nearby, which happens to be where most of the waste already is too.
Ultimately we have a responsibility to future generations to handle these dangerous materials responsibly.