Unlike natural gas though, uranium is easy to stockpile and doing so is pretty standard (IIRC france keeps 2~3 years worth of fuel stockpiled, plus a 5 years strategic reserve), and there are no new pipelines to build and install if you look for a new supplier, it's "just" a question of that supplier ramping up production or opening mines for whatever price they are interested in. The steps inbetween are pretty much standard international shipping in intermodal containers.