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Corporate Information

 
Press Release (Aug 10,2007)
Plant Status of Kashiwazaki-Kariwa Nuclear Power Station as of August 10th at 14:00
The major plant status of the Kashiwazaki-Kariwa Nuclear Power Station as of 
August 10th at 14:00 is as summarized in the attached sheet. Inspection and work 
items announced as of today at 14:00 is as follows:

[Major Changes]
[New Items]
  - Number of workers in the controlled area at the occurrence of the earthquake: 
    817. (unit1: 418, unit2: 6, unit3: 26, unit4: 1, unit5: 94, unit6: 270, unit7: 2)
    Sixty-five workers were in the reactor building refueling floor inspecting the 
    ceiling crane, preparing for the control rod inspection, decontaminating equipments, 
    etc. Spent fuel pool water splashed on several workers but all of them exited 
    the controlled area after confirming they were not contaminated by radioactive 
    material.
  - At the unit 4 reactor building 3F refueling floor, a leakage of about 200 liter 
    of hydraulic oil was found from the stud bolt tensioner*.
    Leakage ceased. Oil recovery and clean-up completed on August 8th.
    * Hydraulic equipment used to constrict bolts that fix the upper head of the 
      reactor pressure vessel.
  - At the unit 6 reactor building 4F refueling floor, a leakage of about 24 liter 
    of hydraulic oil was found from the stud bolt tensioner*.
    Leakage ceased. Oil recovery and clean-up completed on August 7th.

[Updated Items]
  - At units 1 and 2, TEPCO ordered workers (about 400) to exit the controlled area 
    without using the exit monitoring system after confirming that no one wore work 
    wears for contaminated areas (C-clothes).
    This action was taken from a human safety point of view because all but one exit 
    monitoring system malfunctioned.
    This is a legitimate action prescribed in the emergency procedure.

All units at the station have been shut down and are in stable condition.
No significant movement has been observed in real-time data such as those for the 
main exhaust stack radiation monitor or the monitoring posts.
Therefore, there is no impact to the surrounding environment due to radiation, etc.

[Real-time Data of Kashiwazaki-Kariwa Nuclear Power Station] (Japanese only)
 http://www.tepco.co.jp/kk-np/monitoring/mp-j.html

Appendix: Plant Status of Kashiwazaki-Kariwa Nuclear Power Station after
          the Niigata-Chuetsu-Oki Earthquake (as of August 10th)(PDF 107KB)
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