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-ray pipe monitoring for comprehensive safeguards process monitoring of reprocessing facilitiesRodriguez, D.; Tanigawa, Masafumi; Mukai, Yasunobu; Isomae, Hidemi; Nakamura, Hironobu; Rossi, F.; Koizumi, Mitsuo; Seya, Michio
Proceedings of INMM 58th Annual Meeting (Internet), 9 Pages, 2017/07
Safegaurding nuclear material at reprocessing facilities utilizes sampling to verify the quantity and process monitoring to maintain continuity-of-knowledge to reduce re-verification. Solution Monitoring and Measurement Systems that determine the solution density and volume are installed at solution tanks, though this only provides indirect verification. To offset this safeguards limitation we propose measuring rays from solutions passing through the pipes and at the tanks to provide improved continuous monitoring and direct verification. This can provide both real-time flow measurements and Pu isotopic composition quantification through passive nondestructive assay. This concept was tested by recent experimental studies performed at the Japan Atomic Energy Agency's Plutonium Conversion Development Facility of flowing Pu-nitrate rays. This presentation will describe the concept details and analysis of using ray pipe monitoring as a capability for real-time safeguards verification.
Mukai, Yasunobu; Nakamichi, Hideo; Kobayashi, Daisuke; Nishimura, Kazuaki; Fujisaku, Sakae; Tanaka, Hideki; Isomae, Hidemi; Nakamura, Hironobu; Kurita, Tsutomu; Iida, Masayoshi*; et al.
Proceedings of 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017) (CD-ROM), 8 Pages, 2017/04
TRP has stored the plutonium in solution state for long-term since the last PCDF operation in 2007 was finished. After the great east Japan earthquake in 2011, JAEA had investigated the risk against potential hazard of these solutions which might lead to make hydrogen explosion and/or boiling of the solution accidents with the release of radioactive materials to the public when blackout. To reduce the risk for storing Pu solution (about 640 kg Pu), JAEA planned to perform the process operation for the solidification and stabilization of the solution by converted into MOX powder at PCDF in 2013. In order to perform PCDF operation without adaption of new safety regulation, JAEA conducted several safety measures such as emergency safety countermeasures, necessary security and safeguards (3S) measures with understanding of NRA. As a result, the PCDF operation had stared on 28th April, 2014, and successfully completed to convert MOX powder on 3rd August, 2016 for about 2 years as planned.
Fujisaku, Sakae; Mukai, Yasunobu; Isomae, Hidemi; Yoshimoto, Katsunobu
no journal, ,
no abstracts in English
Isomae, Hidemi; Nakamura, Hironobu; Matsumoto, Masaki; Kato, Yoshiyuki; Nakamichi, Hideo; Koiso, Katsuya*; Shoji, Kaoru*
no journal, ,
Ring monitor by glass dosimeter was designed and applied to the radiation management for glove box operation. The radiation management method and the irradiation test results are introduced in this report.
Kato, Yoshiyuki; Kimura, Yuichi; Isomae, Hidemi; Kurita, Tsutomu; Yoshimoto, Katsunobu; Makino, Takayoshi; Suzuki, Masahiro; Kihara, Yoshiyuki
no journal, ,
no abstracts in English
Takahashi, Naoki; Isomae, Hidemi; Yoshimoto, Katsunobu; Matsumoto, Masaki
no journal, ,
no abstracts in English
Takahashi, Naoki; Isomae, Hidemi; Kurita, Tsutomu; Yoshimoto, Katsunobu; Takahashi, Yoshiharu*; Nago, Toshihide*; Tochihara, Yutaka*; Wakabayashi, Hitoshi*; Lee, J.-Y.*
no journal, ,
no abstracts in English
Kimura, Yuichi; Kato, Yoshiyuki; Isomae, Hidemi; Yoshimoto, Katsunobu; Arai, Nobuyuki*; Numao, Teruhiko*; Shinozaki, Yoshinori*
no journal, ,
The plutonium and uranium nitrate solution processes evaporation, the concentrate, and the denitration with the micro wave denitration apparatus. It is necessary to grasp the electric field in the denitration apparatus to irradiate the micro wave efficiently. It reports on the result of behavior of the electric fieldin the denitration apparatus by the electric field analysis.
Tanigawa, Masafumi; Kato, Yoshiyuki; Isomae, Hidemi; Komatsuzaki, Mai*; Yoshino, Masanori*
no journal, ,
no abstracts in English
Numata, Shinji; Isomae, Hidemi; Omura, Masami; Tsutagi, Koichi; Kobayashi, Daisuke; Nakamura, Daishi; Nemoto, Masahiro; Iida, Masayoshi*; Tajiri, Kazuma*; Kurita, Tsutomu
no journal, ,
no abstracts in English
Okada, Jumpei; Nishino, Saki; Terunuma, Ryuki; Takahashi, Naoki; Isomae, Hidemi
no journal, ,
no abstracts in English
Tanigawa, Masafumi; Matsuki, Takuya; Yasuda, Takeshi; Tsutagi, Koichi; Samoto, Hirotaka; Sekine, Megumi; Suzuki, Satoshi*; Kitao, Takahiko; Nakamura, Hironobu; Isomae, Hidemi
no journal, ,
no abstracts in English
Nishino, Saki; Nemoto, Ryo*; Hayashi, Hiroyuki*; Kobayashi, Daisuke; Isomae, Hidemi; Sakuma, Shuhei; Takimoto, Misaki; Okuyama, Shun; Unno, Motoyoshi; Kitao, Takahiko
no journal, ,
At the JAEA Tokai Reprocessing facility, especially workers engaged in Plutonium Conversion Development Facility (PCDF) are required strict radiation control due to working environment handling various nuclear material including plutonium (Pu) at short range. Because the equivalent dose limit of the lens of the eye stipulated by Japanese regulations has been revised downwards, we reassessed personal dose equivalent focusing on the lens of the worker's eye. The reassessment results indicate that wearing the appropriate radiation protection glasses is necessary for some workers who handle Pu including waste material in PCDF. Radiation management using protective glasses has started under revised radiation control plan.