Evaluation of Workers’ Exposure Dose 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.
TEPCO recently submitted to the Ministry of Health, Labour and Welfare a report on the exposure dose evaluation the data of which are those collected until the end of January 2016.

Following is part of the report:

  • 304 workers joined the workforce at the Fukushima Daiichi Nuclear Power Station in January 2016
  • The maximum value of the external exposure dose among the workers who engaged in the work of the power station in January 2016 was 16.44mSv
  • 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.
  • The data of the exposure dose evaluation until the end of February 2016 will be reported to the Ministry of Health, Labour and Welfare by the end of March 2016.

 

*”Workers exposed to especially high radiation” means workers who are involved in operations in which they could be exposed to the emergency exposure 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 cooling facility to cool down the reactor facility or 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.

To learn more, read the Exposure Dose Distribution.