> We still learn lessons from each accident, for example Fukushima has resulted in Passive auto recombiners being installed which convert hydrogen back to water.

Seems we are on a global level not very much learning from incidents. These are common (mandatory?) in Germany and colloquially named “Töpfer-Kerze” after the minister who had them installed: https://de.m.wikipedia.org/wiki/Reaktorsicherheit#T%C3%B6pfe... Klaus Töpfer was responsible for nuclear security from 1987-1994. This would have been the time to learn.