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Murata, Isao*; Ota, Masayuki*; Miyamaru, Hiroyuki*; Kondo, Keitaro; Yoshida, Shigeo*; Iida, Toshiyuki*; Ochiai, Kentaro; Konno, Chikara
Journal of Nuclear Materials, 417(1-3), p.1127 - 1130, 2011/10
Times Cited Count:2 Percentile:17.82(Materials Science, Multidisciplinary)Nuclear data are indispensable for development of fusion reactor candidate materials. However, benchmarking of the nuclear data in MeV energy region is not sufficient even now. In the present study, benchmark performance in the MeV energy region was investigated theoretically in case of experiments by using a 14MeV neutron source. We carried out a systematical analysis for light to heavy materials. As a result, the benchmark performance for neutron spectrum was confirmed to be acceptable, while for -ray it was not sufficient. This indicates it was effective to use a spectrum shifter. As a shifter beryllium had the best performance. Moreover, it was preliminarily examined whether it is really acceptable that only the spectrum before last collision is considered in the benchmark performance analysis. It was pointed out that not only the last collision but also more previous collisions should be taken into account equally in the benchmark performance analysis.
Tanaka, Teruya*; Sato, Satoshi; Kondo, Keitaro; Ochiai, Kentaro; Murata, Isao*; Takakura, Kosuke; Sato, Fuminobu*; Kada, Wataru*; Iida, Toshiyuki*; Konno, Chikara; et al.
Fusion Science and Technology, 60(2), p.681 - 686, 2011/08
Times Cited Count:1 Percentile:10.43(Nuclear Science & Technology)Irradiation experiments of 14 MeV neutrons have been performed on a Li block assembly of 46 51
51 cm
with a 5 cm thick V-alloy layer inside to examine the accuracy of neutronics calculations for the Li/V-alloy blanket design. Foils of Nb, Ni, In and Au for reaction rate measurements of
Nb(n,2n)
Nb,
Ni(n,p)
Co,
In(n,n')
In,
Au(n,
)
Au reactions and
Li enriched (
Li: 95.5%) and
Li enriched (
Li: 99.9%) Li
CO
pellets for tritium production rate measurements were installed in the assembly. Results of the measurements were compared with those of calculations with MCNP5, JENDL-3.3 and JENDL/D-99. The comparisons for the reaction rates in the Nb, Ni and In foils indicate that measurements and calculations of the fast neutron transport are consistent almost within 10%. In the comparison for the reaction rates in the Au foils, the underestimation of 15% was found at a surface of the V-alloy layer. There is a possibility that this is due to the elastic scattering cross section of V around 4 keV as previously reported. The comparisons for tritium production rates in the
Li enriched and
Li enriched Li
CO
pellets indicate that calculated rates were larger than results of the measurements by 2-8% and 1-4%, respectively.
Ota, Masayuki*; Kondo, Keitaro; Matsunaka, Masayuki*; Miyamaru, Hiroyuki*; Murata, Isao*; Iida, Toshiyuki*; Ochiai, Kentaro; Konno, Chikara
Fusion Engineering and Design, 84(7-11), p.1446 - 1449, 2009/06
Times Cited Count:3 Percentile:23.90(Nuclear Science & Technology)In order to validate evaluated nuclear data libraries for fusion reactor designs, various integral benchmark experiments with DT neutrons have been carried out so far on structural and advanced blanket materials at the FNS facility of JAEA. In this study, a neutron spectrum shifter, which will be placed between a sample and the DT neutron source to moderate DT neutrons incident to the sample, was adopted in order to carry out the nuclear data benchmarking induced with several MeV neutrons effectively. In order to estimate effects of the spectrum shifter, the ratio of contribution of initial 14 MeV neutrons in leakage neutron and -ray spectra was calculated for the experimental configuration at FNS with a modified MCNP-4C code. The calculations were carried out for a Li
TiO
sample with a Be, LiD, or D
O spectrum shifter. It was found that the Be shifter was superior to others and the contribution of initial 14 MeV neutrons varied depending on material and size of the sample and shifter. The present analysis also suggested that the Be shifter was effective for secondary
-ray experiments.
Kondo, Hiroo*; Fujisato, Atsushi*; Yamaoka, Nobuo*; Inoue, Shoji*; Miyamoto, Seiji*; Iida, Toshiyuki*; Nakamura, Hiroo; Ida, Mizuho*; Matsushita, Izuru*; Muroga, Takeo*; et al.
Fusion Engineering and Design, 75-79, p.865 - 869, 2005/11
Times Cited Count:22 Percentile:79.72(Nuclear Science & Technology)no abstracts in English
Kondo, Hiroo*; Fujisato, Atsushi*; Yamaoka, Nobuo*; Inoue, Shoji*; Miyamoto, Seiji*; Sato, Fuminobu*; Iida, Toshiyuki*; Horiike, Hiroshi*; Matsushita, Izuru*; Ida, Mizuho*; et al.
Journal of Nuclear Materials, 329-333(Part1), p.208 - 212, 2004/08
Times Cited Count:13 Percentile:63.04(Materials Science, Multidisciplinary)no abstracts in English
Nakayama, Shinichi; Iida, Yoshihisa; Nagano, Tetsushi; Akimoto, Toshiyuki
Journal of Nuclear Science and Technology, 40(4), p.227 - 237, 2003/04
Times Cited Count:14 Percentile:63.86(Nuclear Science & Technology)Leaching behavior of synthetic bituminized waste form was studied to inquire data for performance assessment of the geologic disposal. Laboratory-scale leaching tests were performed. The bituminized samples were contacted with an alkaline solution representing cement-contacting groundwater, with a saline solution simulating seawater for a possible repository construction at the coastal area, and with deionized water as reference. The release of soluble components, Na and Cs, was enhanced by the swelling, and considered to be diffusion controlled in the swelled layers of the specimens. The release of insoluble components such as Ba and Np was solubility-limited in addition to control by the progression of leaching. Neptunium, a redox-sensitive element, showed a distinct difference in release reflecting the difference between the anoxic and atmospheric conditions. The concentrations of Pu were below the detection limit ( mol/L) under all of the leaching conditions in this study.
Ida, Mizuho*; Horiike, Hiroshi*; Akiba, Masato; Ezato, Koichiro; Iida, Toshiyuki*; Inoue, Shoji*; Miyamoto, Seiji*; Muroga, Takeo*; Nakamura, Hideo; Nakamura, Hiroshi*; et al.
Journal of Nuclear Materials, 307-311(Part2), p.1686 - 1690, 2002/12
Times Cited Count:6 Percentile:38.99(Materials Science, Multidisciplinary)no abstracts in English
Iida, Toshiyuki*; Tanaka, Teruya*; Sato, Fuminobu*; Ochiai, Kentaro; Nishitani, Takeo
JAERI-Tech 2002-077, 38 Pages, 2002/09
no abstracts in English
Tanaka, Teruya; Kaneko, Junichi; Takeuchi, Daisuke*; Sumiya, Hitoshi*; Katagiri, Masaki; Nishitani, Takeo; Takeuchi, Hiroshi; Iida, Toshiyuki*; Okushi, Hideyo*
Review of Scientific Instruments, 72(2), p.1406 - 1410, 2001/02
Times Cited Count:10 Percentile:52.04(Instruments & Instrumentation)no abstracts in English
Tanimura, Yoshihiko; Kaneko, Junichi; Katagiri, Masaki; Ikeda, Yujiro; Nishitani, Takeo; Takeuchi, Hiroshi; Iida, Toshiyuki*
Nuclear Instruments and Methods in Physics Research A, 443(2-3), p.325 - 330, 2000/04
Times Cited Count:39 Percentile:89.65(Instruments & Instrumentation)no abstracts in English
Nakayama, Shinichi; Akimoto, Toshiyuki; Iida, Yoshihisa; Nagano, Tetsushi
Proceedings of International Conference on Scientific Research on the Back-end of the Fuel Cycle for the 21st Century (ATALANTE 2000) (Internet), 4 Pages, 2000/00
no abstracts in English
Iida, Yasuhiko*; Paudyal, P.*; Yoshioka, Hiroki*; Tominaga, Hideyuki*; Hanaoka, Hirofumi*; Zhang, S.*; Hosaka, Masahiro*; Takeuchi, Toshiyuki*; Tobita, Seiji*; Watanabe, Satoshi; et al.
no journal, ,
no abstracts in English
Tanaka, Teruya*; Muroga, Takeo*; Sato, Satoshi; Ochiai, Kentaro; Takakura, Kosuke; Kondo, Keitaro; Konno, Chikara; Kada, Wataru*; Sato, Fuminobu*; Murata, Isao*; et al.
no journal, ,
no abstracts in English