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)
....Appendix2. 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)
<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) |
