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 February 8th to February 14th, 2008.
    (Completed on the following date) 

  • Unit No.2 Fuel and control rod inspection (fuel): 
      February 1st * 
  • Unit No.2 Fuel and control rod inspection (channel box): 
      February 12th 
  • Unit No.3 Inspection of reactor recirculation piping applicable to 
    the Fitness-for-Service rule (ultrasonic testing):
      February 13th
  • Unit No.6 Replacement of seismic data recorders: 
      February 8th 
                                                     * Work schedules added this week

 ○ Inspection and restoration to be commenced between February 15th to February 21st, 
    2008
    (To be commenced on the following date)  

  • Unit No.1 Fuel and control rod inspection (control rod): 
      February 15th 
  • Unit No.3 House transformer inspection (preparation for transportation into 
    the factory): 
      February 20th 
  • Unit No.3 Main generator inspection: 
      February 18th 

 ○ Work Schedule of Major Inspection/Restoration from February 10th to March 8th, 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 February 7th to February 13th, 2008.

 ○ Incidents Information (relating to the Chuetsu-Oki Earthquake)


 <Reports from Feb. 7 to Feb. 13, 2008>


 ○ Other Findings 

  • Unit No.7: 
     Root cause analysis has been conducted for the 2 minor cracks (length of about 3mm 
     and 2mm) found on the reactor well liner.
     The location of cracks has been identified to be on the welded portion of the liner.
     Insufficient welding was found due to locational difficulty caused by the structure 
     as well as liner thinning caused by grinding process to remove excess weld.
     It is assumed that due to the earthquake, the welded portion was hit by a slot plug, 
     leading to penetration cracks.  
     The portion of liner that was cut out for root cause analysis will be repaired by 
     welding by February 26th.  Leakage will be confirmed at the next occasion of reactor 
     well fill-up.

  • Unit No.3: 
     Ultrasonic testing was conducted from January 22nd to February 13th for the crack 
     found on the PLR pipe joint that had been found during the previous inspection. 
     No new crack was found on the joint.  Depth of the crack will be determined through 
     cross-sectional observation.  Prepare work will be done for cutting the pipe.

  • Solid waste storage warehouse: 
     20,027 drums have been confirmed as of January 31st, 2008.

  • Information on Nonconformances (those related to: the Chuetsu-Oki Earthquake; 
    Grades As, A, B, C, D; and non-graded)

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 176KB)