Assessment of radiation doses to off-site responders in TEPCO Fukushima Daiichi Nuclear Power Station Accident

Shimada, Kazumasa; Iijima, Masashi*; Watanabe, Masatoshi*; Takahara, Shogo

Proceedings of Asian Symposium on Risk Assessment and Management 2021 (ASRAM 2021) (Internet), 17 Pages, 2021/10

The radiation doses received by the off-site responders in the Fukushima Daiichi Nuclear Power Station accident were assessed. Atmospheric dispersion simulation was conducted with the source term of the previous research to calculate the atmospheric concentration and ground surface deposition in the municipalities where off-site responders actives. The external exposure dose from cloudshine and groundshine, the internal exposure dose due to inhalation of radioactive plume and resuspended radio nuclei, and the temporal and spatial distribution within each municipality were assessed. As a result of comparing the assessed values of the external exposure dose with the measured values of the personal dosimeter, the measured values were within the assessed range. As a result of our assessment with internal dose exposure, if the exposures occurred without protective measures, the potential daily effective dose in the period between 12 and 31 March 2011 were several tens mSv per day or more in the relatively high dose area. Therefore, to keep the doses received by the responders below the reference level of 20 mSv recommended by the ICRP, it is necessary to ensure that the protective measures for internal exposures such as masks are taken, and to manage the time spent for their activity at least daily.

Decommissioning plan of the Fukushima Daiichi Nuclear Power Station and CPD of the nuclear and radiation professional engineers for Fukushima support activity

Sasaki, Satoru

Gijutsushi, 28(8), p.8 - 11, 2016/08

AA2016-0156.pdf:1.53MB

This serialization article will describe Continuing Professional Development (CPD) of the nuclear and radiation professional engineers for Fukushima support activity after the Fukushima Daiichi Nuclear Power Station accident. In this first article, the structure and the outline of the serialization are noticed. Based on the lecture of CPD, issues and risks of the decommissioning plan of the Fukushima Daiichi Nuclear Power Station are manifested.

Estimation of on-site radionuclides inventories of Fukushima Daiichi NPS based on their off-site distribution, 1; Overview and preliminary research

Iijima, Kazuki; Dohi, Terumi; Niizato, Tadafumi; Fujiwara, Kenso; Koma, Yoshikazu; Suzuki, Shinichi; Oda, Yoshihiro; Omura, Yoshihito*; Sasaki, Takayuki*; Namba, Kenji*

no journal, , 

For the purpose of estimation of radionuclides inventory in the various radioactive solid wastes, such as soils, trees, generated from decommissioning of Fukushima Daiichi Nuclear Power Station (FDNPS), the methodology of estimation of on-site radionuclides inventories is being developed based on the dependency on distance and direction from the FDNPS of their off-site distribution.