Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY 2024

Kokubun, Yuji ; Hosomi, Kenji  ; Inoue, Kazumi; Koike, Yuko; Uchiyama, Rei; Sasaki, Kazuki; Maehara, Yushi; Matsuo, Kazuki; Uesugi, Misaki; Yamashita, Daichi; Hirao, Moe; Sasaki, Hikaru ; Maruo, Yoshihiro; Nemoto, Masashi; Tobita, Keiji; Nagai, Shinji; Noguchi, Mizuki*; Onuma, Toshimitsu*; Yaguchi, Katsumi*; Sawahata, Yoshikazu*; Sugai, Masamitsu*; Sasaya, Shinji*; Tadokoro, Satoshi*; Kaminaga, Masayuki*; Sato, Yoshimi*; Maejima, Kyoko*; Terakado, Ryo*; Tayama, Tomohiro*; Komukai, Ryusei*

The Nuclear Fuel Cycle Engineering Laboratories conducts environmental radiation monitoring around the reprocessing plant in accordance with the "Safety Regulations for Reprocessing Plant of JAEA, Part IV: Environmental Monitoring". This report summarizes the results of environmental radiation monitoring conducted during the period from April 2024 to March 2025 and the results of dose calculations for the surrounding public due to the release of radioactive materials from the plant into the atmosphere and ocean. In the results of the above environmental radiation monitoring, several items were affected by radioactive materials emitted from the accident at the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company, Incorporated (changed to Tokyo Electric Power Holdings, Inc. on April 1, 2016), which occurred in March 2011. Also included as appendices are an overview of the environmental monitoring plan, an overview of measurement methods, measurement results and their changes over time, meteorological statistics results, radioactive waste release status, and an evaluation of the data which deviated of the normal range.