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San Onofre is not on the coast and would not be affected by a Tsunami like the plant in Japan.

San Onofre:
SideViewofSanOnofre.jpg

From: http://ranchosantamargarita.patch.com/articles/nuke-plant-chief-san-onofre-could-have-withstood-the-japanese-quake

One of the major problems with the Japanese plant was that the 23-foot tsunami wiped out backup diesel generators that run the cooling system at the plant. Dietrich said that wouldn't happen at San Onofre; not only is the plant protected by a 30-foot reinforced seawall---seven feet higher than the crest of the tsunami that struck Japan---but also, the generators are in water-tight, missile-resistant bunkers that sit at an elevation of 30 feet above sea level.

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Fukushima Power Plant:

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From http://www.theoildrum.com/node/7637


I. recall reading the elevation was some 45 feet above sea level.

I. recall hearing 15meters, which is the same thing. The pictures I saw showed the buildings on a coastal bluff. Most likely the cooling water intakes got fouled by tsunami debris. I heard the diesel gen sets were running when the tsunami hit. On hindsight, it would have been prudent to have diesel gen shutdown during tsunami. I think the reactor buildings themselves were designed for the 15M event, but obviously the emergency cooling system wasn't.

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