We have been evaluating exposure dose of workers at Fukushima Daiichi
Nuclear Power Station in the two categories, which are "Internal exposure
dose" and "External exposure dose".
We have sequentially submitted interim reports to Ministry of Health,
Labor and Welfare on the following items when each reporting due date
comes, and have made announcements*.
(Previously announced on December 27, 2011)
We would like to announce that we have compiled the following two issues
and reported to Ministry of Health, Labor and Welfare today.
- The number of employees newly engaged in the work in December was 761,
and the maximum external exposure dose was 21.51 mSv.
In addition, no significant value was measured regarding the internal
exposure of the workers in December
- We announced about status of internal exposure dose of "Workers who
applied provisional measure " and "Specific workers under high radiation
dose" again.
We are planning to report on evaluation status of internal exposure dose
to Ministry of Health, Labor and Welfare about as follows until February
29.
* The workers who applied Emergency dose limit (100mSv) shown in
"Ordinance on Prevention of Ionizing Radiation Hazards, chapter 7."
Specifically, it means the workers who engaged in the work to maintain
the function that cooling reactor facility or spent fuel tank at the
area where the radiation dose exceed 0.1 mSv /h and reactor facility,
steam turbine and related facilities and surrounding area in the power
plant or the work to maintain the function to control or prevent release
of huge amount radioactive material due to trouble or break of reactor
facility.
* The workers who are applied dose limit (250mSv) based on ministerial
ordinance relating to special provision of "Ordinance on Prevention of
Ionizing Radiation Hazards, chapter 7" until April 30, 2012 even after
repealing of the ministerial ordinance on December 16, 2011.
<Exhibit>
Distribution of Exposure Dose etc (PDF 18.0KB)
