We have been determining the exposure dose*1 of each worker during the
emergency work at Fukushima Daiichi Nuclear Power Station. On April 27th,
2011, 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 17.55 mSv, which is in excess of statutory
dose limits*2 (5 mSv / 3 months).
With regard to the female employee, we have confirmed by a medical
diagnosis that there is no impact on her health.
Since March 23rd, we have not had the female employee work within the
premise of Fukushima Daiichi Nuclear Power Station.
We are continuously determining the exposure dose in the 4th quarter.
*1 Determination of the exposure dose
Determining the exposure dose by adding exposure dose during the stay in
Main Anti-Earthquake Building to the exposure dose during the work and
evaluating the committed effective dose of internal exposure
*2 statutory dose limits
Section 9-1-1 of Regulation on the installation and operation of nuclear
Stipulates that exposure dose of workers may not exceed the limits set
force by the Minister of Economy, Trade and Industry
Section 4-2 of Regulation on the prevention of ionizing radiation injury
Section 6-3 of Notice on the exposure dose limits based on section 4-2 of
Regulation on the prevention of ionizing radiation injury:
Stipulates that the effective radiation dose of a female worker may not
exceed 5 mSv in 3 months