7 days
It is not science fiction, you can get uranium from seawater today. It costs 2 to 4 times more than land mining today. The fact is that uranium is a small part of the cost of energy for nuclear so that translates in 5% to 10% more cost on the price of energy.
This without fast breeder reactor that reuse uranium from other reactors. And those exists today (Russia bn-600 and bn-800 for example)
We have 90 years to solve a problem we solved already today. This is not an issue at all.
Best thing is that the condition imposed by the US to reduce tariffs to import from the EU is for the EU to buy more American oil.