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Tomita, Yutaka; Kumata, Masahiro; Wakabayashi, Shuji; Kijima, Yuichi; Yamamoto, Yoichi; Oda, Tetsuzo
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Tomita, Yutaka; Kijima, Yuichi; Furuno, Akiko; Yamamoto, Yoichi
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The Japan Atomic Energy Agency (JAEA) has operated two radionuclide stations which are Takasaki radionuclide station (RN38) and Okinawa radionuclide station (RN37) for the CTBT (Comprehensive Nuclear- Test-Ban Treaty) International Monitoring System (IMS). RN38 was built in the Takasaki Advanced Radiation Research Institute of the National Institutes for Quantum and Radiological Science and Technology (QST) in 2002. Radioactivity of particulate radionuclides and radioxenon gases are measured at RN38 by using a Radionuclide Aerosol Sampler / Analyzer (RASA) and a Swedish Automatic Unit for Noble Gas (SAUNA) respectively. It was worthy of special mention that the SAUNA of RN38 detected the radioxenons which were related to the DPRK-3 event in 2013. RN37 was installed in a renovated facility at the Okinawa Tracking and Communication Station of the Japan Aerospace Exploration Agency (JAXA) in 2006. It measures only radioactivity of particulate radionuclides by using a RASA. JAEA contributes to the CTBT international verification regime through these activities. Operation and some monitoring results of both radionuclide stations will be reported in this presentation.
Tomita, Yutaka; Furuno, Akiko; Yamamoto, Yoichi
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Various restrictions under the COVID-19 crisis have been imposed on the operation and maintenance of the radionuclide stations of RN37 and RN38 in Japan. We will report on how JAEA is working with PTS, manufacturers of RASA and SAUNA, and local operators in order to overcome this challenge.
Tomita, Yutaka; Furuno, Akiko; Kurihara, Toshiyuki; Yamamoto, Yoichi; Sakurai, Shinichi*
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There are the two IMS radionuclide stations, RN37 Okinawa and RN38 Takasaki, in Japan. JAEA (Japan Atomic Energy Agency) has been operating both of the stations. RN37 Okinawa has been observing for more than 15 years without long missing periods since received the certification in February 2007. RN37 Okinawa is located in the subtropical zone and close to the sea. Therefore, the station building and equipment are susceptible to corrosion due to high temperature, high humidity, and salt damage. This makes maintenance more difficult than that of RN38 Takasaki which is located inland in the temperate zone. In this presentation, we will report on O&M specific for the RN37 Okinawa, including measures against salt damage, lightning, and humidity, etc.
Tomita, Yutaka; Furuno, Akiko; Yamamoto, Yoichi; Kurihara, Toshiyuki
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We are operating the National Data Center (NDC-2) in Japan Atomic Energy Agency (JAEA), and we receive and analyze data from radionuclide stations of Comprehensive Nuclear-Test-Ban Treaty (CTBT) located around the world. These data can be used not only to detect nuclear tests, but also to confirm of the presence of the accidental release of radionuclides from the nuclear facilities. We introduce in this presentation about our results of radionuclide and atmospheric dispersion analyses for a case in which CTBT monitored anthropogenic radionuclides were detected at the Stockholm station (RN63) in Sweden in June 2020. We have also analyzed data from a radionuclide station located downwind from the Zaporizhzhia NPP since its shelling in March 2022 following the Ukrainian conflict. These results will also be shown in the presentation.