I'm still haunted by what to do with thousands of "radioactive cement blocks."

They have a rather better chance of staying where you put them than a radioactive lake or a cloud of radioactive steam, which are the alternatives.

With that throughput, it looks like the Landysh/Suzuran is designed to cope with fairly high-level waste, substantially more hazardous than what's been let out to sea. There is a lot of that to deal with. It may not be the complete solution but it should be a useful extra resource.