Well, to continue operating the three nuclear plants that are currently still operating (not to mention restarting those that have been shut down years ago), they would have to order new fuel rods. Obviously those aren't things you can simply order on Amazon. Usually, these orders have to be planned years in advance, and the chances of reducing the waiting time are pretty slim, because guess who is the largest manufacturer? Right, https://en.wikipedia.org/wiki/Rosatom.