You could do tours of Isar 2 a few years ago (German nuclear plant: https://en.wikipedia.org/wiki/Isar_Nuclear_Power_Plant https://en.wikipedia.org/wiki/Isar_Nu

You could do tours of Isar 2 a few years ago (German nuclear plant: https://en.wikipedia.org/wiki/Isar_Nuclear_Power_Plant https://en.wikipedia.org/wiki/Isar_Nuclear_Power_Plant), including walking through the inner reactor area. I'm not sure if they still do these tours now that Germany has decided to phase out nuclear energy, but asking couldn't hurt.