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 of nuclear power plants. We notify 
that today we reported the results of the 2010 fiscal year (April 1st, 
2010 to March 31st, 2011) to NISA.

We reviewed the 2010 fiscal year's information related to earthquake-proof
safety such as national institutes' reports, academic research papers, 
publications like magazines and overseas information, and sought for 
information that would possibly lead to the reevaluation of 
earthquake-proof safety and margin of earthquake-proof.

As a result, we have found no new information that would have impact on 
the evaluation of earthquake-proof safety and margin of earthquake-proof.

With regard to the knowledge of the Tohoku-Chihou-Taiheiyou-Oki Earthquake
which occurred on March 11th 2011, we will examine and review the 
forthcoming information, and will properly deal with new knowledge which 
should be taken into account.

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

Attachment: "Continuous scientific/technical knowledge collection on
            earthquake-proof safety of nuclear power plants and efforts
            on improvement of assessment" (PDF 35.2KB)

*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.

Attachment1: Subjects of data collection on earthquake safety (PDF 34.0KB)
Attachment2: Flowchart for organizing information related to
             earthquake-proof of nuclear plants (PDF 35.6KB)