Fukushima Daiichi Nuclear Power Station:
Units 1 to 3: shutdown due to the earthquake
(Units 4 to 6: outage due to regular inspections)
-2:00 pm on May 1st : the transfer of accumulated water in Unit 6 turbine
building to a temporary tank was started.
-April 30th: we upgraded the voltage of offsite power for Unit 3 and 4
from 6.9 kV to 66 kV in order to secure power supply capacity in future
as well as to enhance insulation level.
-We decided to blockade each vertical shaft as a countermeasure against
Tsunami, and have started the work for Unit 2 and 3 since May 1st. (We
already blockaded the vertical shafts of Unit 4 on April 6th.)
-May 1st: we sprayed the dust inhibitor to the area on the south side of
the turbine building of Unit 4 using the unmanned crawler dump truck,
approx. 1,000 m2
-May 1st: we sprayed the dust inhibitor to the slope surrounding the
former Administration Office Building using the conventional method.
-May 1st: we have confirmed that the effective exposure dose from January
1st, 2011 to March (the 4th quarter of the 2010 fiscal year) of a female
employee who has been in the restoration work after the
Tohoku-Chihou-Taiheiyou-Oki Earthquake is 7.49 mSv, which is in excess of
statutory dose limits (5 mSv / 3 months). The employee will be taking
medical examination on May 2nd.
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