Summery of the results of the investigation regarding tsunami generated by 
Tohoku-Taiheiyou-Oki-Earthquake which arrived in Fukushima Daiichi Nuclear 
Power Station and Fukushima Daini Power Station are as follows.

At Fukushima Daiichi Nuclear Power Station, on the ocean-side of the main 
building area, inundation with inundation height of approximately 
O.P. + 14 to 15 meters (inundation depth approximately 4 to 5 meters) 
occurred in most of the area. At Fukushima Daini Nuclear Power Station, 
inundation with inundation height of approximately O.P. + 6.5 to 7 
meters occurred in the ocean-side areas, however, only surrounding areas 
of Unit 1 and 2 buildings and the south side of Unit 3 building was 
inundated within the main building area.
Accordingly, we have confirmed that the impact of tsunami was relatively 
larger in Fukushima Daiichi Nuclear Power Station than Fukushima Daini 
Nuclear Power Station.
                                             (Announced on April 9th,2011)

We reported the results to Nuclear and Industrial Safety Agency on April 
9th,2011. Today, we received the order paper from Nuclear and Industrial 
Safety Agency that requires conducting more specific analysis and 
evaluation on tsunami which arrived in Fukushima Daiichi Nuclear Power 
Station and Fukushima Daini Nuclear Power Station.

In our opinion, we will follow this paper, arrange data on trace of 
tsunami inside and outside of Fukushima Daiichi Nuclear Power Station and 
Fukushima Daini Nuclear Power Station, analyze the particularity of 
tsunami and influence from tsunami on both power stations, and report the 
results to Nuclear and Industrial Safety Agency.

*Instruction

 "Next Action based on Results of the Investigation regarding Tsunami 
 generated by Tohoku-Chihou-Taiheiyo-Oki Earthquake which arrived in 
 Fukushima Daiichi Nuclear Power Station and Fukushima Daini Nuclear Power 
 Station (Order)"

On April 9th, Report on results of the Investigation regarding Tsunami 
generated by Tohoku-Chihou-Taiheiyo-Oki Earthquake (hereinafter called 
"this earthquake") which arrived in Fukushima Daiichi Nuclear Power 
Station and Fukushima Daini Nuclear Power Station were submitted to 
Nuclear and Industrial Safety Agency.

According to the report, from the investigation regarding tsunami trace of 
both power stations, in Fukushima Daiichi Nuclear Power Station, in almost 
all the area with nuclear reactor building and turbine building, the 
inundation height is approximately O.P. + 14 to 15 meters. In Fukushima 
Daini Nuclear Power Station, in the east-side area, the inundation height 
is approximately O.P. + 6.5 to 7 meters and in the south-side area, the 
inundation height is approximately O.P. + 14 to 15 meters

We, Nuclear and Industrial Safety Agency (hereinafter called "NISA") have 
judged that specific analysis and evaluation on tsunami with re-creation 
calculation in both power stations based on results of the investigation 
regarding tsunami generated by this earthquake are necessary.

That is why NISA requires TEPCO to analyze and evaluate the things as 
below, and to report by July 8th, 2011.

In addition, it is necessary for research and review for the things as 
below to be implemented in consideration of radiation influence to workers.

*Remark
1. Data arrangement on tsunami trace inside and outside of the power 
station site
In order to analyze the particularity and the influence of tsunami to both 
stations, it is necessary to record and arrange the data on tsunami trace 
as precisely as possible. The detail is as follows:
 -improvement on accuracy to estimate the height of tsunami and inundation 
  area
 -movement of the bottom of the ocean floor in front of the power station 
  site
 -ground deformation under the power station site (ground subsidence)
 -Situation of floating wreckage (size, weight, distance)
 -Damage situation in buildings and civil engineering structure (including 
  inundation)

2. Analysis of particularity and influence of tsunami to both power 
stations
In addition to re-creation calculation of tsunami, based on the results, 
it is necessary to analyze particularity and influence of tsunami 
generated by this earthquake to both power stations. The detail is as 
follows:
 -analysis on the direction that tsunami came from, inundation channel and 
  process inside the power station site
 -analysis on influence to the facility by tsunami (influence from leading 
  wave and stern wave and from floating wreckage)
 -analysis on the water channel in case the nuclear reactor building and 
  turbine building are inundated and on influence to importance facility 
  with regard to seismic safety

[Glossary]
-Inundation height
 Height of vestige such as discolored area and remains left on buildings 
 and facilities, measured from the base level. (See drawing below.)

-Inundation depth
 Height of vestige such as discolored area and remains left on buildings 
 and facilities, measured from the ground level. (See drawing below.)

-Inundation area
 Area inundated with tsunami. (See drawing below.)

-O.P. (Base level of Onahama Port construction)
 Base level which is 0.727 meters below T.P. (Tokyo Bay mean sea height).