To be fair, Chernobyl was in fact worst case scenario, not only did the situation escalate but because of Soviet socialism they didn't bother to do much about it until plants over in western Europe reported high doses of radiation in the air and it was obvious what was going on.

Passive cooling as safety measure seems like a great way to avoid meltdowns, Europe also doesn't have flood waves or earthquakes so it shouldn't be possible to repeat the Fukushima incident either.

There's no reason to not build more nuclear power in Europe.