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. 

Inspection/Restoration Status

 ○ Inspection and restoration completed between December 19th to December 25th, 2008 
    (Completed on the following date) 

   • Unit No.6 Stack inspection (Inspection of outdoor duct): 
      December 19th 
   • Unit No.7 Turbine inspection (Low-pressure turbine (A) (B) (C) restoration 
     work of blades): 
      December 19th* 
   • Restoration work for administration building and information building, etc. 
     (Repair work of the second floor and third floor of information building): 
      December 19th 
                                     * Work schedules added and altered this week. 

 ○ Inspection and restoration to be commenced between December 26th to January 8th, 2009 
    (To be commenced on the following date)  

   • High-voltage start-up transformer No.2 inspection (Preparation for inspection): 
      January 6th, 2009

 ○ Work Schedule of Major Inspection/Restoration from December 21st, 2008 to January 17th, 2009

   • 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

 (Reference)
  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 December 18th to December 24th, 2008. 

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


  < Reports from December 18 to December 24, 2008 >


 ○ Other Findings

  • During inspection of the control panel of the Average Power Range Monitor*1 located 
    in the main control room of Unit No.4 that is undergoing a regular outage, one of 
    the power supply units (cassette-type: height of about 11cm, width of about 6 cm and 
    depth of about 13cm) was found to be dislocated from the regular position by several 
    centimeters on April 25th, 2008. 
    Inspection of the control panel of the Rod Block Monitor*2 also revealed that 2 
    power supply units were dislocated from the regular position by several centimeters.
    These power supply units are only used for illuminating lamps in the control panels 
    and thus did not have any functional impact to either the Average Power Range Monitor 
    or the Rod Block Monitor and as a result did not have any impact to the integrity of 
    nuclear safety. 

    Based on the investigation of the cause of the dislocation of the cassette-type power 
    supply units, the deterioration of the blade spring due to extended usage time coupled 
    with the seismic force were presumed to have caused the dislocation.
    The relevant control panels are planned to be replaced during the current outage and 
    will be modified to be fixed with screws.

      *1 The Average Power Range Monitor is one of the instrumentation devices that 
         measures the reactor power output during normal operation by measuring the 
         neutron flux in the reactor. 

      *2 The Rod Block Monitor is one of the interlocks that blocks the control rods 
         from being withdrawn unless specific conditions are met during reactor power 
         of 30% and above. 

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 116KB)