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When you have a planned shutdown date, you stop doing maintenance work that is needed to continue operating after that date. Maybe there's some leeway, maybe there isn't. Depends on how much maintenance was skipped, and how much maintenance is required de jure and how much maintenance is required de facto.

Ideally, on the day after planned shutdown, your reactor would be in need of refueling, and all the other large maintenance items; and you wouldn't have the parts on hand to do it. 19 years is plenty of time to align the schedules.

[_ph_]

That is the same issue with the idea of keeping the German reactors running. Everything has been planned with the scheduled stop of operations at the end of the year. After politics is now considering to keep them running, the whole technical challenges come to the the light. Take the one reactor operating still in Bavaria: the fuel rods are so weak that after November the plant cannot be restarted with these fuel rods. Also, there is a leaking valve which soon has to be repaired. Only optinon now is to shut the reactor down, repair the valve and restart ist. But even then, the operation isn't guaranteed, as reactors often have to be shut down for small incidents. But any of those would mean the stop of the operation of the reactor.

One way or the other, the next time this plant shuts down after November, it stays down. So there is no big hope of this plant operating for much longer any way you turn it. Of course, new fuel rods could be ordered, but probably that would take over a year, as far as I know. Which means, it will not be part of the energy supply for the next 12 months and whether the investment into getting new fuel rods and keeping the plant ready for service for another year is worth it, is another question.