Plan for the unforeseeable
The Fukushima accident has shown that it is also necessary to guard against external nobn nuclear events. The earthquake of magnitude 9 caused the loss of high voltage lines feeding the plant. Then the tsunami drowned the emergency diesel generators, causing a blackout that stop the cooling pumps. Finally, the tsunami and explosions scattered around multiple debris impeding rescue actions. The coincidence of all these failures were not foresseen. For instance, to avoid the accident, it would have been enough to have higher dikes or to shelter diesel groups from water .