Nuclear Power

I was listening to a radio show about nuclear power today. The safety concerns and the potential improvements with respect to carbon emissions are pretty well-trodden ground, but I haven't heard much about where uranium comes from. Is there an OPEC for uranium? Would using more nuclear power allow us to be more independent?

This article, titled "Lack of fuel may limit U.S. nuclear power expansion", says

Much of the uranium used by the United States is coming from mines in such countries as Australia, Canada, Namibia and, most recently, Kazakhstan. Small amounts are mined in the western United States, but the United States is largely reliant on overseas supplies. The United States also relies on Russia for half its fuel [converted from weapons].