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Nagao, Fumiya; Oki, Noriko*; Sawada, Noriyoshi*; Shidomi, Masaaki*; Maruyama, Renta*; Kamikawa, Tsutomu*; Ito, Satomi; Niizato, Tadafumi; Kurikami, Hiroshi
JAEA-Data/Code 2025-008, 60 Pages, 2025/09
JAEA-Data-Code-2025-008.pdf:3.0MB
JAEA-Data-Code-2025-008-appendix(CD-ROM).zip:351.97MB
The Great East Japan Earthquake and the following tsunami caused the accident at the Fukushima Daiichi Nuclear Power Station. As a result, a large amount of radioactive materials was discharged into the environment. The Japan Atomic Energy Agency (JAEA) started research on the dynamics of radioactive materials in the environment and disseminated the results on the JAEA website "Base Information Q&A Site". A database site "Database for Radioactive Substance Monitoring Data" was also established to collect, form, and consolidate monitoring data on radioactive substances in the environment and air dose rates obtained and disclosed by various organizations, in addition to the environmental dynamics research of JAEA. Subsequently, in order to release the findings obtained through the research and the actual monitoring data as a single entity, they were compiled and operated as the portal site "Fukushima Comprehensive Environmental Information Site" (FaCE!S). With the establishment of the Fukushima Institute for Research, Education and Innovation, F-REI, the environmental dynamics research at JAEA was terminated and transferred to F-REI. Therefore, the Q&A site was also transferred to FREI in FY2025. This report summarizes the efforts of FaCE!S up to FY2024, and archives the Q&A site as of FY2024.
Yamashita, Takuya; Sawada, Noriyoshi*
JAEA-Research 2019-010, 227 Pages, 2020/03
JAEA-Research-2019-010.pdf:21.44MBJAEA-Research-2019-010(errata).pdf:0.5MB
In order to support the decontamination activities proceeded by the national government and municipalities in terms of technology, we have developed a simulation system "RESET" which predicts the effect of decontamination. We also developed a "two-component model" for the purpose of predicting long-term changes in the air dose rate. We use these tools to perform decontamination simulation and predictive analysis of the air dose rate after decontamination, and provide information to the national government and municipalities aiming for reconstruction. In this report, the verification result of the prediction methods implemented using actual measurement data obtained in the "Decontamination model demonstration project in difficult-to-return zone" and "Survey result on transition of air dose rate after decontamination model demonstration project" conducted by Ministry of the Environment. In addition, the decontamination simulation conducted for the entire difficult-to-return area and the results of future prediction of the air dose rate after decontamination are shown.
Yamashita, Takuya; Sawada, Noriyoshi*
no journal, ,
Decontamination simulations were carried out using the restoration support system for environment "RESET" to provide to the national government and local governments information of decontamination effects and future dose rate necessary for forecasting the reconstruction plan of the difficult-to-return zone.
Watanabe, Takayoshi; Kawase, Keiichi; Sawada, Noriyoshi*
no journal, ,
no abstracts in English
Nagao, Fumiya; Kurikami, Hiroshi; Ito, Satomi; Sawada, Noriyoshi*; Oki, Noriko*
no journal, ,
JAEA is running the website named FaCEIS, in that we arrange the information about environmental radioactivity and air dose rate originated by FDNPP accident. We JAEA provide the information with scientific base to serve the knowledge and safety about Fukushima environment.