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Collaborative Laboratories for Advanced Decommissioning Science; NAIS*
JAEA-Research 2025-004, 102 Pages, 2025/08
JAEA-Research-2025-004.pdf:3.33MB
For planning radioactive waste management at the Fukushima Daiichi Nuclear Power Station of the Tokyo Electric Power Company Holdings, Incorporated, estimation of radioactivity is essential with considering both contamination from the damaged fuel and activation during reactor operation; with regard to the latter, biological shielding is an important object due to its large amount. It is difficult to conduct field investigations or collect analysis samples at the site, hence the radioactivity should be estimated by calculative analysis with considering the actual conditions of the constituent materials, especially for activation of minor components and water, which affects the neutron flux. Besides it is important to assess the uncertainties involved in the calculation analysis. In this study, the trace composition and water content in the biological shielding concrete were investigated, and a three-dimensional computational model was constructed for the Unit 2 reactor building at the site to estimate the radioactivity concentration. In order to evaluate the uncertainty in the results, the factors contributing to the uncertainty were extracted and the uncertainty resulted from those factors on the calculation results, i.e. the influence of the diversity of the calculation model the parameters used in the calculation model. Based on the results, the dominant factors contributing to the uncertainty were extracted, and the handling as radioactive waste was discussed.
Mg, Si, Fe, Cu, and ZnSugihara, Kenta*; Meigo, Shinichiro; Iwamoto, Hiroki; Maekawa, Fujio
Nuclear Instruments and Methods in Physics Research B, 549, p.165299_1 - 165299_12, 2024/04
Times Cited Count：0 Percentile：0.00(Instruments & Instrumentation)
Ti and 
Nb at 0.8 and 3.0 GeVSugihara, Kenta*; Meigo, Shinichiro; Iwamoto, Hiroki; Maekawa, Fujio
Nuclear Instruments and Methods in Physics Research B, 545, p.165153_1 - 165153_9, 2023/12
Times Cited Count：2 Percentile：40.49(Instruments & Instrumentation)Nakano, Keita; Matsuda, Hiroki*; Meigo, Shinichiro; Iwamoto, Hiroki; Takeshita, Hayato*; Maekawa, Fujio
JAEA-Research 2021-014, 25 Pages, 2022/03
JAEA-Research-2021-014.pdf:2.1MB
For the development of accelerator-driven transmutation system (ADS), measurement of nuclide production cross-sections in proton-induced reactions on 
Be, C, 
Al, 
Sc, and V have been performed. The measured data are compared with the calculations by the latest nuclear reaction models and with the nuclear data library to investigate the reproducibilities.
Verzilov, Y. M.; Ochiai, Kentaro; Nishitani, Takeo
Fusion Science and Technology, 48(1), p.650 - 653, 2005/07
Times Cited Count：7 Percentile：43.83(Nuclear Science & Technology)no abstracts in English
Ohashi, Hirofumi; Inagaki, Yoshiyuki
JAERI-Tech 2003-046, 47 Pages, 2003/05
JAERI-Tech-2003-046.pdf:3.15MB
no abstracts in English
Noguchi, Hiroshi; Yokoyama, Sumi
Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 6 Pages, 2000/05
no abstracts in English
Seki, Yasushi
Purazuma, Kaku Yugo Gakkai-Shi, 74(8), p.795 - 801, 1998/08
no abstracts in English
Komuro, Yuichi; Suzaki, Takenori; ; Sakurai, Kiyoshi; Horiki, Oichiro*
JAERI-Research 97-088, 19 Pages, 1997/11
JAERI-Research-97-088.pdf:0.86MB
no abstracts in English
Konno, Chikara; Oyama, Yukio; Maekawa, Fujio; Ikeda, Yujiro; Kosako, Kazuaki*; Maekawa, Hiroshi; M.A.Abdou*; Bennett, E. F.*; A.Kumar*; M.Z.Youssef*
Fusion Technology, 28(2), p.347 - 365, 1995/09
no abstracts in English
Konno, Chikara; Oyama, Yukio; Ikeda, Yujiro; ; ; Kosako, Kazuaki*; Maekawa, Hiroshi; Nakagawa, Masayuki; Mori, Takamasa; Nakamura, Tomoo; et al.
Fusion Technology, 28(2), p.273 - 295, 1995/09
no abstracts in English
Konno, Chikara; Oyama, Yukio; Maekawa, Fujio; Ikeda, Yujiro; Kosako, Kazuaki*; Maekawa, Hiroshi; M.A.Abdou*; A.Kumar*; M.Z.Youssef*
Fusion Engineering and Design, 28, p.708 - 715, 1995/00
no abstracts in English
Seki, Yasushi; ; Aoki, Isao; ; Sato, Satoshi; Takatsu, Hideyuki
Journal of Fusion Energy, 12(1-2), p.11 - 19, 1993/00
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)no abstracts in English
Oyama, Yukio; ; ; Ikeda, Yujiro; Konno, Chikara; Maekawa, Hiroshi; Nakamura, Tomoo; K.G.Porges*; Bennett, E. F.*; R.F.Mattas*
JAERI-M 89-215, 208 Pages, 1989/12
no abstracts in English
Co and 
Mn in Graphite Material of Irradiated HTGR Fuel Assemblies; ; ; Minato, Kazuo; ; Ikawa, Katsuichi; Iwamoto, K.
JAERI-M 84-088, 24 Pages, 1984/05
no abstracts in English
; Shiba, Koreyuki;
Bulletin of the Chemical Society of Japan, 36(3), p.258 - 263, 1963/00
Times Cited Count：10no abstracts in English
Motoyama, Risa; Hinai, Hiroshi; Koma, Yoshikazu
no journal, ,
Takahatake, Yoko; Koma, Yoshikazu
no journal, ,
The radioactive nuclides dispersed without control to on- and off-site of Fukushima Daiichi Nuclear Power Station (F1NPS) at its accident in 2011. A large amount of radioactive solid waste has been generated during its decommissioning. Radioactivity inventory of the solid waste should be estimated for R&Ds on waste management. Cobalt-60 is often selected as a key-nuclide for determining activity in solid waste generated at nuclear power plant, and is also detected in various F1NPS waste. In this study, radiochemical analysis data opened to public was investigated for correlation between Co-60 and nuclides of activation and fission products as well as actinides (H-3, C-14, Ni-63, Sr-90, Tc-99, I-129, Cs-137, Eu-154, Am-241, Pu-239+240). Cobalt-60 well correlated with Ni-63, Eu-154, Am-241 and Pu-239+240 in spite of differences in physical/chemical properties and process of contamination. This finding suggests a possibility to apply Co-60 as a key-nuclide of scaling factor method.
Sugihara, Kenta; Meigo, Shinichiro; Iwamoto, Hiroki; Nakano, Keita; Maekawa, Fujio
no journal, ,
At the Japan Proton Accelerator Research Complex (J-PARC), nuclide production cross section of silicon for GeV-proton incidence was measured. The experimental results were compared with past experimental data, calculated results with the PHITS code and the evaluated nuclear data library JENDL/HE-2007. In addition, the results were compared with the results for aluminum of which atomic number is close to that silicon.
