The location of the plant was (Fukushima Newclear Power Plant ) on a bluff which was originally 35-meters above sea level. During construction, however, TEPCO lowered the height of the bluff by 25-meters. One reason the bluff was lowered was so that the base of the reactors could be constructed on solid bedrock to mitigate the threat posed by earthquakes. Another reason was the lowered height would keep the running costs of the seawater pumps low.
TEPCO did not factor in the tsunami risk when planning the site's construction. Therefore, the lowered height would result in the plant being more vulnerable to tsunami .The Fukushima Daiichi site is divided into two reactor groups, the leftmost group when viewing from the ocean contains units 4,3,2 and 1 going from left to right. The rightmost group when viewing from the ocean contains the newer units 5 and 6, respectively the positions from left to right. A set of seawalls protrude into the ocean, with the water intake in the middle and water discharge outlets on either side.
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