Press Releases 2014

We have been evaluating the exposure dose of workers at the Fukushima Daiichi Nuclear Power Station under two types, internal and external exposure to radiation. Then we have submitted the evaluation results to the Ministry of Health, Labour and Welfare by the submission deadlines.

(Previously announced)

We 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 November 2014. Below is the outline:

-Seven hundred two workers joined the workforce at the Fukushima Daiichi Nuclear Power Station in November. The maximum value of the external exposure doses among the workers who engaged in the work of the power station in November was 13.40mSv, 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.

The data of the exposure dose evaluation until the end of December 2014 will be reported to the Ministry of Health, Labour and Welfare by the end of January 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 take place due to malfunction or damage of the reactor facility.