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 May 21 to May 27, 2010 
    (Completed on the following date) 

   - No notable activity during this week. 

 ◇ Inspection and restoration to be commenced between May 28 to June 3, 2010 
    (To be commenced on the following date) 

   - Unit 1 Functional test for the entire plant: 
       May 21*

   - Restoration works of filtrate tank/ demineralized tank on Arahama-side (Restoration 
     work of No.2 filtrate tank): 
       May 29
                                                         * Work schedule added this week.

 ◇ Work Schedule of Major Inspection and Restoration from May 23 to June 19, 2010

   - 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 May 20 to May 26, 2010. 

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


    <Reports from May 20 to May 26, 2010>


 ◇ Other Findings

   - We have confirmed that there is a possibility of a seat leakage in the reactor 
     feedwater pump bypass valve and turbine-driven reactor feedwater pump discharge 
     valve (B) of Unit 1.
     Subsequent detailed investigation revealed that there was a broad area of faulty 
     contact of the valve seat of the turbine-driven reactor feedwater pump discharge 
     valve (B). We will restore the valve after polishing the valve seat surface and 
     making adjustment of the contact surface of the valve that touches the pipe when 
     the valve is closed. 

   - On May 22, malfunction was found in the control of the backup cooler of the 
     off-gas system in Unit 1. Subsequent investigation revealed malfunction of a 
     control valve of the coolant, which was replaced and the system was restored. 

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 70.5KB)