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Shinohara, Nobuo; Asano, Yoshie; Hirota, Naoki*; Hokida, Takanori; Inoue, Yoji; Kumata, Masahiro; Nakahara, Yoshinori*; Oda, Tetsuzo*; Uchikoshi, Takako*; Yamamoto, Yoichi
Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 3 Pages, 2005/10
Research activities of JAERI related to the CTBT verification regime are presented in the International Conference. The subjects of this presentation are (1) an overview of the CTBT verification regime, (2) construction and operation of the radionuclide monitoring stations of Okinawa (RN37) and Takasaki (RN38) and the certified radionuclide laboratory (RL11), and (3) preparation of the National Data Center at Tokai (JAERI NDC) for radionuclide data. The RN38 station has been certified by the CTBTO/PrepCom and sending the measured data every day. The infrastructures and operational manuals for RN37 and RL11 are now preparing for their operations. The JAERI NDC has experimentally analyzed and evaluated the radionuclide data from all over the world through International Data Center (IDC). As an example of the JAERI NDC works, atmospheric dispersion backtracking system has been developing by using WSPEEDI (Worldwide Version of System for Prediction of Environmental Emergency Dose Information) code to estimate a source location of radionuclide release by nuclear explosion/accident.
Kurihara, Toshiyuki; Yamamoto, Yoichi; Furuno, Akiko; Tomita, Yutaka
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Japan Atomic Energy Agency operates the Tokai Radionuclide Laboratory (JRL11) as part of the International Monitoring System for the Comprehensive Nuclear-Test-Ban Treaty. We replaced our detector system in January 2020, due to the deterioration of the high-purity germanium semiconductor detector used in the analysis system of JPL11 over time. The first surveillance assessment visit (SAV) after the detector replacement was conducted by PTS in the last October, where they pointed out the calibration method of the detector, traceability of the calibration equipment, and other issues. This presentation will first provide an overview of the new detector system, and some actions taken with the system replacement such as the detection efficiency correction and the detector geometry correction. Then we will present some issues from SAV and future operations based on these findings.