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 October 26th to November 1st, 2007
(Completed on the following date)
Unit No.1 Turbine building ceiling crane inspection:
October 26th
Unit No.1 Main transformer visual inspection:
Planned to be completed on November 1st
Unit No.3 Turbine building ceiling crane inspection:
October 30th
Unit No.3 Main transformer oil extraction/internal inspection:
October 26th
Unit No.5 Reactor head opening:
October 29th
Unit No.6 Main transformer inspection (transportation into the factory):
October 31st
Low-voltage start-up transformer 3SA oil extraction/internal inspection
(in service):
October 26th
○ Inspection and restoration to be commenced between November 2nd to November
8th, 2007
(To be commenced on the following date)
Unit No.1 Reactor pressure vessel inspection:
November 5th
Unit No.2 Excitation transformers visual inspection preparation:
November 8th
Unit No.3 Reactor pressure vessel inspection:
November 8th
Unit No.4 Reactor pressure vessel inspection preparation:
November 5th
Unit No.4 Turbine internal inspection:
November 8th
Unit No.5 Main generator inspection:
November 3rd
Unit No.6 Reactor head opening:
November 5th
Unit No.6 and 7 Reactor internal pump input transformer
(preparation for transportation into the factory):
November 1st*
Unit No.7 Main generator inspection:
November 2nd
Unit No.7 Verification operation of feedwater pump and condensate pump:
November 6th
*Not announced last week.
○ Work Schedule for Major Inspection/Restoration from October 28th to November
24th, 2007
Work Schedule of the Main Inspection/Restoration of 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 October 25th to October 31st, 2007.
○ Incidents Information (relating to the Chuetsu-Oki Earthquake)
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<Reports from Oct. 25 to Oct. 31, 2007>
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○ Other Findings
Unit No.7:
Commenced drainage of the reactor well on October 26th and completed on October
27th. As a result, water inflow to the leak detection piping of the reactor
well liner has ceased almost completely on October 28th. Since the amount of
leakage from the wall at the 2nd floor of the reactor building has decreased
as the water level of the reactor well decreased, leakage is presumed to be
originating from the reactor well. Therefore, we will identify the leak spot
by inspecting the reactor well.
Unit No.7:
Completed the withdrawal of the one control rod that could not be initially
withdrawn on October 24th (announced on October 25th). Disassembly and
inspection of the control rod drive will be conducted to determine the cause.
Inspection of the reactor internals (control rods, control rod guides, fuel
supports) will be conducted after completing the inspection of the reactor
well liner.
Appendix: Work Schedule of the Main Inspection/Restoration of Kashiwazaki-Kariwa Nuclear
Power Station in Response to the Niigata-Chuetsu-Oki Earthquake
(during 4 Weeks)(PDF 232KB)
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