As the investigation results regarding tsunami arrived in Fukushima 
Daiichi and Daini Nuclear Power Stations generated by the Tohoku - 
Taiheiyou - Oki - Earthquake occurred at around 2:46 pm on March 11, 
2011, we have indicated each inundation height and area as well as we 
have reported to Nuclear and Industrial Safety Agency (hereafter "NISA") 
that the impact of the tsunami in Fukushima Daiichi Nuclear Power Station 
was relatively larger than Fukushima Daini Nuclear Power Station.
                                             (Announced on April 9th,2011)

And also, we have received directive that requires implementation of more 
detailed analysis and evaluation on tsunami arrived in Fukushima Daiichi 
Nuclear Power Station and Fukushima Daini Nuclear Power Station from NISA.
                                            (Announced on April 13th,2011)

After that, based on this directive, we conducted tsunami investigation 
at inside and outside of the site, and analyses of characteristics of the 
tsunami and effects by inundation to the power station, etc. regarding 
tsunami arrived in Fukushima Daiichi and Daini Nuclear Power Stations.

As results of tsunami investigation and numerical simulations, we 
estimated that the height of the tsunami at the tidal observatory of both 
power stations were approximately 13m in Fukushima Daiichi Nuclear Power 
Station and approximately 9m in Fukushima Daini Nuclear Power Station 
respectively. 
As for the factor of this differential, we consider that it would be 
caused by difference of the overlap level of the peak of the tsunami from 
the large landslide area expected off the coast of Miyagi Prefecture and 
Fukushima Prefecture.
And also, we summarized the impacts to main buildings such as reactor 
building and turbine building as well as important facilities for seismic 
safety of both power stations by this tsunami.

Today we reported to NISA on aforementioned contents.
                                                                       End

Attachment: 
Report on investigation results regarding tsunami generated by the Tohoku
- Taiheiyou - Oki - Earthquake in Fukushima Daiichi and Daini Nuclear
Power Stations (vol.2) [outline] (PDF 1.45MB)

We have provided a Japanese press release version of the instruction 
document received from NISA. However, at this time we have reserved the 
right to not provide an English version due to potential misunderstandings 
that may arise from an inaccurate rendering of the original Japanese text. 
We may provide the English translation that NISA releases in our press 
releases. However, in principle we would advise you to visit the NISA 
website for timely and accurate information.