Maybe the Convention could propose Japan to create a purpose build transporter that can take one of the wrecked reactors including their concrete ground below it into orbit to drop it into the Sun? I don't think Fenspace has a transporter that large (including its freight-door), but they could build one, which at least would solve the problem how to get rid of a part of the problem.
It would be a major effort for Fenspace to do so (and some Daneverse people would have to be involved to make sure the Fen don't try to "steal" the nuclear waste) and it doesn't handwave away the radiation in the surrounding area and the damage by the Earthquake/Tsunami, but it could help a lot in long term.
It would be a major effort for Fenspace to do so (and some Daneverse people would have to be involved to make sure the Fen don't try to "steal" the nuclear waste) and it doesn't handwave away the radiation in the surrounding area and the damage by the Earthquake/Tsunami, but it could help a lot in long term.