Also, have you ever done some research on how winds work? They're usually blowing (or not blowing) across the whole continent.
So, yeah, Dunkelflauten usually cover the whole continent.
https://communities.springernature.com/posts/quantifying-the...
Ed Conway released a video on the UK's gas network and disaster planning[0].
As shown in their documentary, a shutdown of exports to Europe would only require 2 or 3 failure events (low production from wind/solar, high-usage of gas for power/heating, disruption or cessation of imports via gas-tankers, well-placed damage to the gas network, extreme weather in the north sea). To maintain pressure in the gas network, they would begin shedding the largest loads first, exports to mainland Europe is #1 on that list.
Let's also not forget Nordstream and the disaster that caused when it mysteriously blew up. Before those pipelines exploded, there were protests in Germany because people were struggling to heat their homes.
Nuclear isn't vulnerable to any of these issues, we're very lucky that construction and investment has continued these past decades. /s
Nuclear is unsuited for this problem. Europe needs something that will supply approximately all of its power needs for only a few days a year. Europe already has enough natural gas storage to do this. If you built enough nuclear to cover all its power needs for a few days a year you'd have enough nuclear to supply all its power needs 365 days a year. That would work great, but it would cost tens of trillions.