We, Tokyo Electric Power Company, received an instruction document*1 from 
the Nuclear and Industrial Safety Agency (NISA) of the Ministry of Economy, 
Trade and Industry (NISA) on April 28. As a consequence of the occurrence 
of Tohoku-Chihou-Taiheiyou-Oki Earthquake, after which a huge crustal 
movement was observed, we have reviewed and summarized the Information 
regarding fault, which is necessary to take into consideration in the 
seismic design, which is necessary to review the possibility of 
eligibility to take into consideration in the seismic design of nuclear 
power station, for existing nuclear power station with existing survey and 
submitted to NISA on May 31, 2011.

On June 6, 2011, we received an additional instruction document*2
regarding the above matter (Previously announced on June 6, 2011). 
Therefore, we conducted investigations on the amount of crustal movements 
and occurrence of earthquakes at the faults which we had evaluated that 
they need not to be considered for the seismic design. At the same time, 
we conducted ground reconnaissance and summarized a report regarding the 
faults of which we cannot deny the possibility that they fall into the 
faults which need to be considered for the seismic design and analyzed the 
influence upon the standard ground motion. Today we reported the results 
of our analysis to NISA.

Through the survey in relation to the report, we confirmed that a normal 
type of earthquake fault appeared along Yunotake Fault which had not been 
considered as an active fault in our seismic design. In order to survey 
the past activities of Yunotake Fault and study the causes and mechanism 
by which an earthquake fault appeared, we started boring and trenching 
survey on September 29 and reported on the status of the survey (flash) on 
November 21. 
(Previously announced on April 29, May 31, August 30, September 28, and 
November 21, 2011)

Today we announce that the survey on Yunotake fault has been completed and 
report the results.

                                                                       END

Attachment: Results of boring and trenching survey survey on Yunotake
            Fault (Summary)(PDF 248KB)
 
*1 Instruction document
   "Regarding the additional opinion of NISA for the analysis of reporting 
   the results of evaluation of earthquake-proof safety of existing 
   reactor facilities for power generation, referring to the new 
   earthquake-proof standards established based on the Tohoku-Chihou-
   Taiheiyo-Oki Earthquake, 2011 (Instruction)" 
                                                (April 28, 2011 NISA No.4)
*2 Additional instruction document
   "Regarding the response to the addition of opinions upon considered by 
   NISA in relation to the report of the evaluation results on seismic 
   safety of existing nuclear power reactor facilities etc. in light of 
   the new Seismic Regulatory Guide based on the 2011 Tohoku District-Off 
   the Pacific Ocean Earthquake (additional instruction)"
                                                  (June 3, 2011 NISA No.1)

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.