Corporate Information

Press Release (Nov 14,2007)
International Nuclear Event Scale (INES) on Incidents at the Kashiwazaki-Kariwa Nuclear Power Station after the Niigata-Chuetsu-Oki Earthquake
On July 25, The Tokyo Electric Power Company, Inc. (TEPCO) and Kashiwazaki-Kariwa 
Nuclear Power Station have submitted the Report on Nuclear Facility Failures and 
Electricity Related Incidents to the Ministry of Economy, Trade and Industry (METI) 
for four incidents that happened subsequent to the Niigata-Chuetsu-Oki earthquake 
on July 16, 2007.
On November 13, the METI Subcommittee on INES Evaluation released the result of 
the interim evaluation for the four incidents.

In INES Evaluation the two of four incidents, which were relevant to Niigata-Chuetsu-Oki 
earthquake, were evaluated as "0-" —no safety significance. The rest two incidents 
were out of scale.

1. Water leakage containing radioactive materials into the uncontrolled area of 
   Kashiwazaki-Kariwa NPS Unit 6.                                          "0-"

2. Spillover at the reactor building refueling floor of Kashiwazaki-Kariwa NPS 
   Units 1 to 7.                                                           "0-"

3. Breakage of the coupling of drive axis of the reactor building ceiling crane 
   of Kashiwazaki-Kariwa NPS Unit 6.                             "out of scale"

4. Fire of house transformer of Kashiwazaki-Kariwa NPS Unit 3.   "out of scale"

1. INES Evaluation Subcommittee is a committee under the jurisdiction of the METI.
   It was established to evaluate incidents at nuclear facilities based on INES 
   from experts' technical perspective.

2. INES evaluation is conducted by the INES Evaluation Subcommittee based on INES
   (INES:International Nuclear Scale).

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