Tsunamim from the mainland to the nuclear facilities?
You just can not build a whole country as safe as Nuclear power plant itself .. therefore will be different events ..
In my idea of fresh water tank bund height, does not have to be high, just 20 m, because the same tank now you have to build on the high bank, for example, 100 m (300 ft) course very near sea ..
http://enenews.com/npr-dam-operators...-happens-video
http://seattletimes.com/html/localne...adamcrack.html