Honestly, if the US is worried about the plutonium being extracted out of this reactor by the local government, DON'T SELL ONE OF THESE TO THAT GOVERNMENT. Chances are that countries like the ones who would want to steal plutonium will find other ways to do it and will simply buy their reactor technologies from somewhere else. Sure didn't stop North Korea from developing nuclear weapons. Besides, I don't see where it says only the United States is allowed to have nuclear weapons.
Being Canadian, I know that the Canadian government had sold a bunch of CANDU reactors to other countries, and I'd be willing to bet that we didn't try to squeeze licensing fees out of them for it. Of course, it may just be that Canada is too polite to ask.