Press Releases 2015

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 have 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 December 2014. Here is part of the report: six hundred twenty five workers joined the workforce at the Fukushima Daiichi Nuclear Power Station in December 2014. The maximum value of the external exposure dose among the workers who engaged in the work of the power station in December 2014 was 15.41mSv, and regarding the internal exposure dose, no significant value was measured. The data about the exposure dose of "workers exposed to especially high radiation^*1" are provided separately from the data about those of other radiation workers.
Under the guidance of the Ministry of Health, Labour and Welfare, TEPCO had conducted investigations on 1) the exposure dose of TEPCO’s employees engaging in radiation work at the Fukushima Daiichi Nuclear Power Station during the initial stages of the Fukushima Daiichi nuclear accident (i.e. investigations on internal exposure dose since May 2011^*2 and on transfer and stay doses) and 2) work categories of the employees at that time (i.e. an investigation on their actual engagement status in specified emergency works). We updated the data of the exposure dose based on the results of the investigations, which are shown in the Attachments.
The data of the exposure dose evaluation until the end of January 2015 will be reported to the Ministry of Health, Labour and Welfare by the end of February 2015.

*1 "Workers exposed to particularly 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.

*2 Regarding the internal exposure dose in March and April 2011, TEPCO's employees had already been re-evaluated following the guidance of the Ministry of Health, Labour and Welfare (The results were reported there on March 25, 2014.) TEPCO thus this time carried out an investigation on the internal exposure dose of the employees since May 2011. On December 26, 2014, before reporting the whole results of the investigation, TEPCO submitted a review of the exposure dose of the employees whose figures exceed 100mSv to the Ministry of Health, Labour and Welfare.