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 May
(9,899 persons out of 10,652 intended persons were evaluated.
Remaining 753 persons 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 13, 20, 30, July 13, 20, 29 and August 10)
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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 May became 288 persons from 753 persons as
of August 10. The evaluation results of workers who finished evaluation
this time are as follows.
Over 20mSv 2 persons (maximum 22.0mSv for March)
- The evaluation results of workers who finished evaluation for June are
as follows. Also there are 297 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 June as of today and for July
(September 15)
- Progress status of the investigation for the workers whose contact
information are unknown (September 15)
END
*1 The number of the evaluated from March to May as of August 10
March: 3,715 persons out of 3,754 intended persons (39 persons are remaining.)
April: 3,463 persons out of 3,689 intended persons (226 persons are remaining.)
May: 2,721 persons out of 3,209 intended persons (488 persons are remaining.)
*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 27.1KB)