The reactors in Fukushima and their protection against flooding and cooling failure would have never passed German safety standards.
Japan’s nuclear safety standards were way too lenient before the Fukushima accident happened.
All the changes that were implemented in Japan after the disaster have been standard in Germany for decades such as hydrogen recombiners, bunkered emergency generators and a filtered containment depression system.
If any German nuclear reactor had been standing in Fukushima, there would have been no accident!