Refine your search:     
Report No.
 - 
Search Results: Records 1-13 displayed on this page of 13
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Performance analysis of fusion nuclear-data benchmark experiments for light to heavy materials in MeV energy region with a neutron spectrum shifter

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:18.37(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 $$gamma$$-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.

Journal Articles

Measurement of reaction rates in Li/V-alloy assembly with 14 MeV neutron irradiation

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:10.77(Nuclear Science & Technology)

Irradiation experiments of 14 MeV neutrons have been performed on a Li block assembly of 46 $$times$$ 51 $$times$$ 51 cm$$^3$$ 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 $$^{93}$$Nb(n,2n)$$^{rm 92m}$$Nb, $$^{58}$$Ni(n,p)$$^{58}$$Co, $$^{115}$$In(n,n')$$^{rm 115m}$$In, $$^{197}$$Au(n,$$gamma$$)$$^{198}$$Au reactions and $$^6$$Li enriched ($$^6$$Li: 95.5%) and $$^7$$Li enriched ($$^7$$Li: 99.9%) Li$$_2$$CO$$_3$$ 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 $$^6$$Li enriched and $$^7$$Li enriched Li$$_2$$CO$$_3$$ pellets indicate that calculated rates were larger than results of the measurements by 2-8% and 1-4%, respectively.

Journal Articles

Preliminary spectrum shifter design for intermediate energy nuclear data benchmark experiments with DT neutrons

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:24.54(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 $$gamma$$-ray spectra was calculated for the experimental configuration at FNS with a modified MCNP-4C code. The calculations were carried out for a Li$$_{2}$$TiO$$_{3}$$ sample with a Be, LiD, or D$$_{2}$$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 $$gamma$$-ray experiments.

Journal Articles

Surface wave on high speed liquid lithium flow for IFMIF

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:21 Percentile:79.08(Nuclear Science & Technology)

no abstracts in English

Journal Articles

High speed lithium flow experiments for IFMIF target

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:64.02(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Leaching behavior of simulated bituminized radioactive waste form under deep geological conditions

Nakayama, Shinichi; Iida, Yoshihisa; Nagano, Tetsushi; Akimoto, Toshiyuki

Journal of Nuclear Science and Technology, 40(4), p.227 - 237, 2003/04

 Times Cited Count:12 Percentile:62.35(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 ($$2 times 10^{-10}$$ mol/L) under all of the leaching conditions in this study.

Journal Articles

Water jet flow simulation and lithium free surface flow experiments for the IFMIF target

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:5 Percentile:39.58(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Study of neutron irradiation effects on mineral insulated cables for fusion reactors (Contract research)

Iida, Toshiyuki*; Tanaka, Teruya*; Sato, Fuminobu*; Ochiai, Kentaro; Nishitani, Takeo

JAERI-Tech 2002-077, 38 Pages, 2002/09

JAERI-Tech-2002-077.pdf:2.7MB

no abstracts in English

Journal Articles

Diamond radiation detector made of an nultrahigh-purity type IIa diamond crystal grown by high-pressure and high-temperature synthesis

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:8 Percentile:46.79(Instruments & Instrumentation)

no abstracts in English

Journal Articles

High-temperature operation of a radiation detector made of a type IIa diamond single crystal synthesized by a HP/HT method

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:34 Percentile:88.44(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Leaching tests of simulated COGEMA bituminized waste form

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

Oral presentation

Measurement of reaction rate and tritium production rate in Li/V-alloy mockup

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

Oral presentation

Usability of multi-modality imaging with PET and optical imaging

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

13 (Records 1-13 displayed on this page)
  • 1