I guess the related question is - the half life of Cs137 and St90 are both about 30 years. Can the place just be secured well enough to prevent it from being disturbed for the next few hundred years? Why keep poking at it?
Rain and snow force the radiation toward the river - this needs managing before the building collapses.
Which is disturbing because this spill has been there for about 45 years already - it must have been as hot as hell to start with and you've got to wonder how many workers have been zapped by it over the years.
Someone should start combing through records and finding out who's been in near proximity.
The Cs137 is a lot harder to be around.
And we don't want either in the water or food chain.