Following the instruction issued by the Nuclear and Industrial Safety 
Agency (NISA) at the Ministry of Economy, Trade and Industry on May 8th, 
2009, we have been trying to collect new scientific/technological knowledge
on earthquake-proof safety as it concerns nuclear power plants, and we have
already reported the 2010 fiscal year results (April 1st, 2010 to March 
31st, 2011) to NISA on April 28th, 2011. (Previously announced on April 
28th, 2011)

Subsequently, the report and discussion concerning literature etc. 
regarding the Tohoku-Chihou-Taiheiyou-Oki Earthquake (the Earthquake) are 
continuing via various academic meetings etc. In light of the fact that 
Fukushima Daiichi and Fukushima Daini Nuclear Power Stations were damaged 
by the Earthquake, we collected and summarized the information from 
academic meetings etc. and today reported the material to NISA.

We will continue with the collection and analysis of literature etc. as 
well as the summarization of new scientific/technological knowledge, and 
will report our findings to NISA by the end of April, 2012.

We will continue to collect new scientific/technological knowledge 
concerning earthquake-proof safety of nuclear power plants.

                                                                        End

Attachment:
"Continuous scientific/technical knowledge collection on earthquake-proof
safety of nuclear power plants and efforts on improvement of assessment"
(2011 report about new knowledge regarding Tohoku-Chihou-Taiheiyou-Oki
Earthquake) (Summary)  (PDF 8.76KB)

*Instruction by the Nuclear and Industrial Safety Agency (NISA) at the 
Ministry of Economy, Trade and Industry (May 8th, 2009)

"Continuous scientific/technical knowledge collection on earthquake-proof 
safety of nuclear power plants and efforts on improvement of assessment"
1. Mid-and-long term plan and systematic and steady progress are required 
   since it would take long time to collect new knowledge on 
   earthquake-proof safety and reflect the new scientific/technological 
   knowledge to the efforts toward the enhancement of earthquake-proof 
   safety of nuclear plants.
2. It is required to collect information on the soil/ground of and around 
   the premise and widely collect new knowledge on earthquake-proof safety 
   through soil/ground investigation or seismic observation.
3. If the operator finds some knowledge necessary to be reflected among the
   knowledge collected based on 2, it is required to report to NISA by the 
   end of April of next year. Notwithstanding the foregoing, as to 
   knowledge considered as particularly important to the enhancement of 
   earthquake-proof safety of nuclear plants, it is required to report to 
   NISA as soon as possible and share it with other operators of nuclear 
   plants.
4. As a part of maintenance activity based on the quality assurance plan, 
   it is required to reconfirm the earthquake-proof safety of the nuclear 
   plant and conduct repair work in light of the knowledge defined in 3.