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Nagatani, Taketeru; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Nakaguki, Sho; Nomi, Takayoshi; Okumura, Keisuke
Dai-43-Kai Nihon Kaku Busshitsu Kanri Gakkai Nenji Taikai Kaigi Rombunshu (Internet), 3 Pages, 2022/11
Wada, Yuki*; Nakazawa, Kazuhiro*; Enoto, Teruaki*; Furuta, Yoshihiro; Yuasa, Takayuki*; Makishima, Kazuo*; Tsuchiya, Harufumi
Physical Review D, 101(10), p.102007_1 - 102007_6, 2020/05
Times Cited Count：1 Percentile：8.09(Astronomy & Astrophysics)LaFleur, A. M.*; Nakamura, Hironobu; Menlove, H. O.*; Mukai, Yasunobu; Swinhoe, M. T.*; Marlow, J. B.*; Kurita, Tsutomu
Proceedings of 37th ESARDA Annual Meeting (Internet), p.435 - 441, 2015/08
The IBAS (Improved Holdup Blender Assay System) system for safeguards and nuclear material accountancy (NMA) of holdup measurements is used at PCDF. The purpose of this detector is to measure the doubles rate from each glovebox in order to determine the mass of Pu holdup. In order to establish calibration curves for the IBAS detector and improve the holdup measurement methodology, JAEA conducted the IBAS calibration exercise with LANL support using MOX standards in 2010. In 2011, a cleanout exercise was performed and the results showed that the holdup removed from the glovebox had a significantly higher alpha term (alpha = 15.8 - 31.5) than the MOX standards (alpha = 0.67) used to establish the 2010 calibration curves. To further investigate these findings, JAEA conducted slope validation measurements in 2013 to confirm the validity of IBAS calibration slopes for the case of high alpha holdup. This paper describes the IBAS slope validation tests, analysis of the experimental results, and the evaluation of the need for a correction factor for the high alpha holdup. Quantifying the alpha term of the holdup in each glove box and understanding how this value changes over time is important to improving the overall NMA at PCDF. The results from this work will provide invaluable experimental data that directly supports safeguards and NMA measurements of plutonium holdup in gloveboxes.
Nakamura, Hironobu; Mukai, Yasunobu; Tobita, Hiroshi; Nakamichi, Hideo; Ozu, Akira; Kureta, Masatoshi; Kurita, Tsutomu; Seya, Michio
Proceedings of 37th ESARDA Annual Meeting (Internet), p.45 - 53, 2015/08
JAEA conducted an R&D project to develop a new type of neutron detector using ZnS/
B
O
ceramic scintillator (as an alternative neutron detector to He-3) with support of Japanese government. The design of the JAEAs alternative system (ASAS: Alternative Sample Assay System using ceramic scintillator tubes) refers basically to the INVS (INVentory Sample assay system) which is the passive type of neutron assay system equipped total 18 He-3 tubes and capable of measuring the small amount of Pu in the MOX powder or Pu nitrate solution in a vial for nuclear material accountancy and safeguards verification. In order to prove the alternative technology and the performance instead of He-3 detector, and to establish Pu measurement capability, JAEA developed and fabricated ASAS equipped 24 alternative ceramic scintillator tubes (which is equivalent to the same counting efficiency of INVS) and demonstrated. The demonstration activity implemented the confirmation of reproducibility about sample positioning, optimization of detector parameters, counting statistical uncertainty, stability check and figure of merit (FOM) using Cf check source and actual MOX powder in PCDF (Plutonium Conversion Development Facility). In addition, performance comparison between the current INVS and the ASAS was also implemented. In this paper, we present demonstration results with design information with Monte-Carlo simulation code (MCNP).
Ishikawa, Masao; Takechi, Manabu; Shinohara, Koji; Kusama, Yoshinori; Cheng, C. Z.*; Matsunaga, Go; Todo, Yasushi*; Gorelenkov, N. N.*; Kramer, G. J.*; Nazikian, R. M.*; et al.
Nuclear Fusion, 45(12), p.1474 - 1480, 2005/12
Times Cited Count：38 Percentile：74.93(Physics, Fluids & Plasmas)To investigate energetic ion transport induced by Alfven eigenmodes (AEs) the neutron emission profile measurement and the charge exchange (CX) neutral particle flux measurement by Natural Diamond Detector has been performed simultaneously in the JT-60U for the first time. The energetic ion profiles inferred from these measurements indicate that ALEs cause a radial redistribution of energetic ions of limited energy range from the core region to the outer region of the plasma in weak shear plasmas. This energy range is consistent with the resonance condition between the mode and the energetic ions. In reversed shear plasmas, reversed-shear-induced AEs (RSAEs) and their transition to TAEs as the minimum value of the safety factor decreases has been observed. Neutron measurements suggest energetic ion loss is large in the transition phase from RSAEs to TAEs.
; Toward superconducting tunnel junctions and superconducting radiation detectors using thermal relaxation processIshida, Takekazu*; Wang, Z.*; Yotsuya, Tsutomu*; Machida, Masahiko
Kotai Butsuri, 40(1), p.51 - 67, 2005/01
no abstracts in English
Yamagishi, Hideshi; Soyama, Kazuhiko; Kakuta, Tsunemi; Ochiai, Masaaki; Iwamura, Takamichi; Saishu, Sadanori*; Urakami, Masao*; Masuda, Naohiro*; Yamauchi, Yuki*; Otani, Junichi*; et al.
JAERI-Tech 2001-053, 19 Pages, 2001/08
JAERI-Tech-2001-053.pdf:2.48MB
no abstracts in English
Nishitani, Takeo; Kutsukake, Chuzo; Hori, Junichi
Purazuma, Kaku Yugo Gakkai-Shi, 77(6), p.609 - 610, 2001/06
no abstracts in English
Yamagishi, Hideshi; Suzuki, Katsuo; Kakuta, Tsunemi;
JAERI-Research 98-063, 21 Pages, 1998/11
JAERI-Research-98-063.pdf:1.17MB
no abstracts in English
Kodama, Ryosuke*; Yoshida, Hidetoshi; *; Nishitani, Takeo; Muto, Sadatsugu*; *; Matsuda, Toshiaki; *; Kawahata, Kazuo*; Isobe, Mitsutaka*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 74(10), p.1208 - 1213, 1998/10
no abstracts in English
-ray measurements in JT-60UKondoh, Takashi; Kusama, Yoshinori; Kimura, Haruyuki; Saigusa, Mikio; Fujii, Tsuneyuki; Moriyama, Shinichi; Nemoto, Masahiro; Tobita, Kenji; Morioka, Atsuhiko; Nagashima, Keisuke; et al.
Journal of Nuclear Materials, 241-243, p.564 - 568, 1997/02
Times Cited Count：12 Percentile：67.93(Materials Science, Multidisciplinary)no abstracts in English
JAERI-M 94-010, 13 Pages, 1994/02
no abstracts in English
Kakuta, Tsunemi; Shikama, Tatsuo*; *;
Radiation Detectors and Their Uses,Proc. of the 8th Workshop; KEK Proc. 94-7, 0, p.109 - 113, 1994/00
no abstracts in English
JAERI-M 93-151, 10 Pages, 1993/07
no abstracts in English
; ; ; Sakasai, Kaoru; H.Brixy*; J.Oehmen*; R.Hecker*; H.-J.Hantke*
Juel-2467, 43 Pages, 1991/04
no abstracts in English
; ; ; Sakasai, Kaoru; J.Oehmen*; H.Brixy*; R.Hecker*
Juel-2468, 40 Pages, 1991/04
no abstracts in English
Kimura, Takaumi
Journal of Nuclear Science and Technology, 27(12), p.1147 - 1150, 1990/12
no abstracts in English
Kimura, Takaumi
IAERU-9002, p.87 - 111, 1990/11
no abstracts in English
Ogawa, Toshihide; ; Hoshino, Katsumichi; Odajima, Kazuo; Maeda, Hikosuke;
Review of Scientific Instruments, 61(10), p.3181 - 3183, 1990/10
Times Cited Count：3 Percentile：49.17(Instruments & Instrumentation)no abstracts in English
Nishitani, Takeo
JAERI-M 89-138, 32 Pages, 1989/10
no abstracts in English
