@toiletpaper >dumping a bunch of nuclear waste on site or that kinda thing.
The only real nuclear waste is low to medium-level medical equipment etc that you dump in a warehouse for a few months and then dump in normal landfill.

There really isn't that much volume of slightly used fuel available, although such highly concentrated Uranium will indeed continue to be radioactive for billions of years.

You could leave it concentrated and dump it in one area, but that would just contaminate that one area only and be rapidly cleaned up, or you could grind the fuel into a really fine power and spread it out, which would make it a massive pain to clean up, possibly making some areas no-go zones for the next 1000 years (but you would probably die from heavy metal poisoning from the Uranium metal powder before you manage to grind down all of it).