We have been posting data of the plant parameters relating pressure at 
Primary Containment Vessel of Unit 1 at Fukushima Daiichi Nuclear Power 
Station at our website from April 18.
We hereby notify that we had confirmed that some of the data from May 11 
and November 29, 2011 are incorrect and so we reported it to NISA today.

<Content>
· Due to inaccurate compensation formula usage from 17:00 pm May 11, 2011, 
  we correct data for pressure at Primary Containment Vessel of Unit 1 
  (989 data in total)
· Due to neglect of compensation formula usage when we changed data 
  sampling device from primary device to digital recorder, we correct data 
  for pressure at Primary Containment Vessel of Unit 1 (128 data in total) 

Exhibit: "Incorrect data for pressure at Primary Containment Vessel of Unit 
         1 at Fukushima Daiichi Nuclear Power Station" (PDF 172KB)