Nuclear waste is a lot of things. Might be that by the pound most of it is junk that got irradiated slightly such as clothing, mops, insulation, water, bulky stuff that wouldn’t be radioactive normally. Used fuel rods, partly used and still hot but not hot enough for the reactor would be some that needs special handling.
It’s pretty nasty stuff in those tanks. I am part of the work force building the vitrification plant, and we learned just a little about what is down there. Not much danger, but the tanks are deteriorating and this stuff needs to be dealt with before it starts leaking into the Columbia. Nothing to be frightened about (at least not yet) as the existing tanks were built pretty well, but they are leaking and the Feds need to clean up their mess...JFK