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.
(a) Evaluation results of internal exposure dose from March to September
(16,916 persons. Remaining 173 persons including 16 persons whose
contact information was unknown will be evaluated hereafter.)*1
(b) From (a), detailed evaluation*2 results of internal exposure dose for
workers with the aggregate evaluation of internal and external
exposure dose over 250mSv (6 persons)
(c) From (a), evaluation results of internal exposure dose for workers
with evaluation of internal exposure dose over 20mSv (351 persons,
including 6 persons in (b))
(Previously announced on October 31)
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We would like to announce that we have compiled the following two issues
and reported to Ministry of Health, Labor and Welfare today.
(1) Evaluation status of internal exposure dose (Refer to Attachment 1 of
the Exhibit)
- The number of workers who are not finished evaluation of internal
exposure dose from March to September became 48 persons from 173
persons as of October 31. The evaluation results of workers who
finished evaluation this time are as follows.
Over 20mSv 1 person
- The number of employees newly engaged in the work on October was 870,
and the maximum external exposure dose was 21.43 mSv.
- The number of employees who finished evaluation of internal exposure
for October was 809, and the results are as follows. Also there are 61
persons to be evaluated hereafter.
Over 20mSv 0 person
(2) Regarding the investigation on the workers whose contact information
is not identified
- We reported it as per Attachment 2 of the Exhibit.
(3) Regarding the measures for wearing respiratory protective equipment.
- We reported it as per Attachment 3 of the Exhibit.
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In addition, we are planning to report to Ministry of Health, Labor and
Welfare as follows.
- Evaluation results of internal exposure dose of the workers who are
not finished evaluation from March to October and November (December
28)
- Progress status of the investigation for the workers whose contact
information are unknown (December 28)
*1 The number of the evaluated from March to September as of October 31
*2 Detailed evaluation of internal exposure dose
Regarding the evaluation of internal exposure dose, firstly, a measurement
of the amount of residual radioactive material by whole body counter (WBC)
installed in Hirono football ground nearby J-VILLAGE will be conducted.
When the result of the measurement exceeds 20mSv, as detailed evaluation,
re-evaluation specifying irradiated date based on interview, etc. or
detailed measurement by using WBC of Japan Atomic Energy Agency (JAEA)
intended for detailed examination will be conducted. The evaluation result
may be reviewed depend on the evaluation progress.
<Exhibit>
Exposure dose of workers engaged in emergency work at Fukushima Daiichi
Nuclear Power Station and related matters (PDF 41.0KB)