Re: even more safer to operate?
Interestingly the worst it finds to say about three specific long-lived fission products which are most difficult to contain geologically is that SMRs wouldn't reduce them.
Of these Wikipedia suggested selenium 79 would be picked up in the food chain. So is C14. It also says it's a weak beta. So is C14. One difference is that Se79 has a much longer half life so the disintegrations per hour of a mole of that are going to be a fraction of those of a mole of C14.