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Tsunami and the Daiichi Nuclear Power Plant

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"The 869 Jogan tsunami deposit and recurrence interval of large-scale tsunami on the Pacific coast of northeast Japan"

http://wwwsoc.nii.ac.jp/jsnds/contents/jnds/23_2_3.pdf
The bottom line is that an 8 m tsunami in the Sendai plane had about a mean recurrence interval of about 800 to 1,100 years.  Let's call it an 8 m tsunami height with a 1,000 year mean recurrence infterval.  This was from a report developed in Japan about 10 years ago and predicated on past tsunamis. 
 
The tsunami wave height at Fukushima is currently listed by the Japan Meteorological Society at 7.3 m, but this will likely be revised.
http://www.jma.go.jp/jma/en/2011_Earthquake/2011_Earthquake_Tsunami.pdf
Japan Meteorological Society investigators can't access the site because of the radioactive contamination. 
 
The tsunami wall at the Fukushima Daiichi nuclear power plant was constructed for a 5.7 m tsunami. 
 
There are water marks on the walls at Daiichi that indicate a tsunami maximum indundation height of 15 m. 
 
It is not known to what probability the 5.7 m wall was predicated.  But by observation the 5.7 m wall was significantly less than the 1,000 year mean recurrence interval that was published 10 years ago. 

Regards, Harold Sprague