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Corporate Information

 
Press Release (Apr 03,2008)
Nonconformances Found in the Inspection and Restoration Works Performed after the Niigata-Chuetsu-Oki Earthquake (April 3rd)
We are announcing the status of major inspections and restoration works and 
nonconformances at TEPCO's Kashiwazaki-Kariwa Nuclear Power Station after 
the Niigata-Chuetsu-Oki Earthquake.
1. Inspection/Restoration Status 

 ○ Inspection and restoration completed between March 28th to April 3rd, 2008.
    (Completed on the following date) 

  • Unit No.3 Excitation transformers inspection (transportation into the factory):
      April 2nd 
  • Unit No.4 Pressure suppression chamber inspection: 
      March 31st 
  • Unit No.5 Fuel and control rod inspection (inspection of spent fuel pool 
    rack etc.):
      April 2nd
  • Unit No.6 Main generator inspection (withdrawal of rotor): 
      To be completed on April 3rd 
  • Unit No.7 New fuel storage warehouse and new fuels in the warehouse inspection 
    (inspection of new fuel storage warehouse): 
      April 1st
  • Unit No.7 Stack inspection (internal inspection): 
      March 27th* 
  • Outdoor fire protection system piping to be placed above ground, installation of 
    fire protection tank, etc. (installation of 17 fire protection tanks): 
      To be completed on April 3rd 
  • Restoration work for port facility (relocation of south-side discharge canal sea 
    water monitor): 
      March 26th*  

 ○ Inspection and restoration to be commenced between April 4th to April 10th, 2008
    (To be commenced on the following date)  

  • Unit No.1 Stack inspection (inspection of substructure of piles): 
      April 4th 
  • Unit No.1 Main exhaust duct inspection and restoration (survey prior to 
    restoration work): 
      April 9th
  • Unit No.2 Main generator inspection (withdrawal of rotor): 
      April 10th 
  • Unit No.2 Main exhaust duct inspection and restoration (survey prior to 
    restoration work): 
      April 9th 
  • Unit No.4 Fuel and control rod inspection (visual inspection of control rod):
      April 9th 
  • Unit No.5 Pressure suppression chamber inspection: 
      April 7th 
  • Unit No.6 Fuel and control rod inspection (inspection of spent fuel pool 
    rack etc.): 
      April 7th 
  • Unit No.6 Main transformer inspection (preparation for carrying in): 
      April 9th 
  • Unit No.6 House transformer (6A, 6B) inspection (carrying in): 
      April 9th 
  • Unit No.6 Stack inspection (internal inspection): 
      April 7th 
  • Unit No.7 Main transformer inspection (installation work): 
      April 7th 
  • High-voltage start-up transformer #3 inspection (preparation for transportation 
    into the factory): 
      April 7th 
  • Restoration work for port facility (restoration work for bank protection):
      March 3rd* 

                                                      * Work schedules added this week

 ○ Work Schedule of Major Inspection/Restoration from March 30th to April 26th, 2008

  • Work Schedule of the Main Inspection/Restoration of the Kashiwazaki-Kariwa Nuclear 
    Power Station in Response to the Niigata-Chuetsu-Oki Earthquake (during 4 Weeks)
                                                                          ....Appendix
2. Nonconformances Found in the Inspection and Restoration Works Performed after the 
   Niigata-Chuetsu-Oki Earthquake 
 
   Based on the "Public Announcement Regarding Nonconformance Found in the Inspection 
   and Restoration Works Performed after the Niigata-Chuetsu-Oki Earthquake", the Tokyo 
   Electric Power Company, Incorporated (TEPCO) provides this announcement containing 
   incidents information reported from March 27th to April 2nd, 2008.

○ Incidents Information (relating to the Chuetsu-Oki Earthquake) 
Incidents Information (relating to the Chuetsu-Oki Earthquake)
<Reports from Mar. 27 to Apr. 2, 2008>
Reports from Mar. 27 to Apr. 2, 2008
○ Other Findings • Unit No.7: As for the inspection for forks of rotor blades on the turbine-side of 14th-stage of the low-pressure turbine (C), based on visual inspection, damage was found on a part of one rotor blade on March 3rd, 2008. Non-destructive inspection was conducted as part of the detailed inspection since March 7th, 2008 for forks of 151 rotor blades except for the one already found to be damaged. As a result, indications were found on the fork of 17 rotor blades. Visual and non-destructive inspections were conducted for forks of 152 rotor blades on the generator-side of 14th-stage of the low-pressure turbine (C) and no additional damage was found (announced on March 13th, March 19th and March 27th, 2008). Subsequently, visual inspection and non-destructive inspection were conducted for forks of 152 rotor blades on the turbine-side and generator-side of 14th-stage of the low-pressure turbine (A). As a result of the non-destructive inspection, an indication was found on a rotor blade on the turbine-side. Additionally, visual inspection was conducted for forks of rotor blades on the turbine-side of 14th-stage of the low-pressure turbine (B) and damage was found on a part of one rotor blade. Investigation on the cause of the indication will be continued as well as visual and non-destructive inspections for other forks of the 14th-stage of the low-pressure turbine (B). Appendix: Work Schedule of the Main Inspection/Restoration of the Kashiwazaki-Kariwa Nuclear Power Station in Response to the Niigata-Chuetsu-Oki Earthquake (during 4 Weeks) (PDF 197KB)
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