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Top > Releases ・ Announcements > Press Releases > 2015 > Evaluation of the exposure dose of workers at the Fukushima Daiichi Nuclear Power Station

Press Releases 2015

Press Release (Jul 31,2015)Evaluation of the exposure dose of workers at the Fukushima Daiichi Nuclear Power Station

TEPCO has been evaluating the exposure dose of workers at the Fukushima Daiichi Nuclear Power Station under two types, internal and external exposure to radiation, and has submitted the evaluation results to the Ministry of Health, Labour and Welfare by the submission deadlines. (Previously announced)
TEPCO today submitted to the Ministry of Health, Labour and Welfare a report on the exposure dose evaluation the data of which are those we collected until the end of June 2015. Here is part of the report: four hundred twenty workers joined the workforce at the Fukushima Daiichi Nuclear Power Station in June 2015. The maximum value of the external exposure dose among the workers who engaged in the work of the power station in June 2015 was 11.21mSv, and regarding the internal exposure dose, no significant value was measured. The data about the exposure dose of "workers exposed to especially high radiation*" are provided separately from the data about those of other radiation workers.
Under the guidance of the Ministry of Health, Labour and Welfare, TEPCO investigated the exposure dose and work categories of it's employees engaged in radiation work at the Fukushima Daiichi Nuclear Power Station during the initial stages of the Fukushima Daiichi nuclear accident, and reported the investigation results on January 30, 2015. The investigation revealed that exposure dose of some of the respondents needed to be revised, so TEPCO notified them of the revised dose values. Then some of them informed us that they had responded to the investigation incorrectly. TEPCO related this fact to all of the respondents that would receive revised notice by phone or in writing, and explained the revision and reconfirmed the situation.
As a result, TEPCO judged it necessary to reinvestigate the exposure dose and work categories of five TEPCO employees who were among the employees whose exposure dose and work categories had been corrected in the previous investigation. TEPCO then has revised the respective data accordingly and are reporting them in the Attachments here.
The data of the exposure dose evaluation until the end of July 2015 will be reported to the Ministry of Health, Labour and Welfare by the end of August 2015.

*"Workers exposed to especially high radiation" means workers who are involved in operations in which they could be exposed to the emergency dose limit (100mSv), which is stipulated in "Ordinance on Prevention of Ionizing Radiation Hazards, Chapter 7." In more detail, they are workers engaged in the work to maintain the function of the reactor facility or the cooling facility to cool down the spent fuel tank in the reactor facility, the steam turbine and its related facilities or the surrounding area where the radiation doses exceed 0.1mSv/h. Or they are workers who would engage in keeping running the function to control or prevent the release of a large number of radioactive materials should it be likely to occur due to malfunction or damage of the reactor facility.

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