We have been evaluating exposure dose of workers at Fukushima Daiichi
Nuclear Power Station in the following two categories:
-Internal exposure dose
-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 July (14,841
persons. Remaining 456 persons including 65 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 (349 persons, including
6 persons in (b))
(Previously announced on June 10, 20, July 7 and September 15)
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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 July became 163 persons from 456 persons as
of September 15. The evaluation results of workers who finished
evaluation this time are as follows.
Over 20mSv 0 person
- The number of employees newly engaged in the work on August was 1,142,
and the maximum external exposure dose was 18.27 mSv.
- The evaluation results of workers who finished evaluation for August
are as follows. Also there are 115 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.
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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 August or September (October 31)
- Progress status of the investigation for the workers whose contact
information are unknown (October 31)
END
*1 The number of the evaluated from March to July as of August 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>
Enhancing controls of internal exposures at Fukushima Daiichi Nuclear
Power Station (PDF 85.1KB)