Enough so that most countries don't know where to store it and nobody wants it in their backyard. Unfortunately, many democractically run countries don't have much area that is "nobobody's backyard" and at the same time geologically stable enough so no radioactive material will ever leak.

Even "very little waste" is quite a big problem if you don't know where to put it. And proponents of nuclear power want to scale it up by a few times, then run the scheme for a couple hundred years.