It is confusing! I’ll add my understanding and it will probably be different than other things you’ve heard, but I’ll add it anyway.

The NRC (for the US) is the regulator. They have ultimate authority to inspect all nuclear power plants. Sometimes the state does as well, depends on the state’s agreement with the NRC. But ultimately it’s the NRC. Every power plant has an NRC inspector whose job it is to look for infractions and make sure the plant is doing all the things. They obviously can’t be everywhere at once, so there’s a bunch of other stuff the plants have to do to prove they are following all the rules. There is currently a huge regulatory burden on nuclear power plant operators and owners. Good. It should be that way for small modular reactors but it remains to be seen of they’ll be able to get away with less safe practices (my bet is yes, at least under the current administration).

Waste is complicated. The US government made a deal a long time ago with the utilities building the plants that they’d provide a place for waste storage, and they haven’t, so they’ve been sued. They’ll just keep getting sued and have to pay the utilities back (the utilities pay for the waste location by paying the gov… It’s weird). There are some attempts being made to have a private company (or companies) take over storing the waste. It’s complicated, and still requires us to transport the waste, which is also complicated. That being said, the DOE has been doing transuranic waste transportation for ages (irradiated junk in barrels) It’s called WIPP and they move all the contaminated crap to a salt mine in NV. It’s not easy, but it can be done.

As for loosing any of the waste… Yeah, if you lose the actual waste that’s very bad and NRC very mad at you. But the irradiated junk? Eh, the government loses shit all the time. Irradiated junk isn’t great, but it’s probably not killing you. Probably not.

And as for who’s profiting? Who knows? It’s like George Carlin said. It’s a big club and you ain’t in it.