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Yokoyama, Kenji; Kitada, Takanori*
Journal of Nuclear Science and Technology, 56(1), p.87 - 104, 2019/01
Times Cited Count:4 Percentile:40.43(Nuclear Science & Technology)no abstracts in English
Iwamoto, Hiroki; Nishihara, Kenji; Katano, Ryota*; Fukushima, Masahiro; Tsujimoto, Kazufumi
JAEA-Research 2014-033, 82 Pages, 2015/03
The effect of experiments using Transmutation Physics Experimental Facility (TEF-P) is analysed from the viewpoint of the reduction of uncertainties in reactor physics parameters (criticality and coolant void reactivity) of an accelerator-driven system (ADS). The analysis is conducted by the nuclear-data adjustment method using JENDL-4.0 on the assumption that ve types of reactor physics experiments (a total of 44 experiments) are performed in TEF-P: (1) criticality experiment, (2) lead void reactivity experiment, (3) reaction rate ratio experiment, (4) sample reactivity experiment, and (5) fuel replacement reactivity experiment. As the result, 1.0% of uncertainty in criticality is found to be reduced to approximately 0.4%, and effective experiments for the reduction of uncertainty in criticality and coolant void reactivity are shown to be fuel replacement reactivity experiments and lead void reactivity experiments, respectively. Although these effects depend largely on the composition and amount of minor-actinide (MA) fuels, it is found that a combination of different types of experiments and database of existing experiments is effective in reducing the uncertainties.
Nuclear Code Evaluation Special Committee of Nuclear Code Research Committee
JAERI-Review 2002-003, 97 Pages, 2002/03
no abstracts in English
; Sato, Wakaei*;
JNC TN9400 2000-037, 87 Pages, 2000/03
ln order to compare the nuclear characteristics of water-cooled bleeder cores with that of LMFBR, MOX fuel cell models are established for boiling and non-boiling LWR, non-boiling HWR and sodium-cooled reactor. Frst, the comarison is made between the heterogeneous cell calculation results by SRAC and those by SLAROM. The results show some differences as for neutron energy spectrum, one-grouped cross section and conversion ratio due to the different grouped cross section library (both are based on JENDL-3.2, though) used for each code, however, the difference is acceptably small for grasping the basic characteristics of the above-mentioned cores. Second, using the SLAROM code, main core parameters such as mean neutron energy, ratio of fast neutron and -value, are analyzed. The comparison between the cores show that softened neutron spectrum by the scattering effect of hydrogen or heavy hydrogen increase the contribution of nuclear reaction (especially for neutron capture reaction rather than fission reaction) in lower energy region comparing with LMFBR. ln order to overcome the effect, tighter lattice than LMFBR is necessary for water-cooled cores to realize the breeding of fissile nuclides. Third, effects of Pu isotopic composition on the breeding ratio are evaluated using SRAC burnup calculation. From the results, it is confirmed that degraded Pu (larger ratio of Pu-240) show the larger breeding ratio. At last, sensitivity analyses are made for k-effective and main reaction ratios. As for k-effective, using a temporary covariance data of JENDL-3.2, uncertainty resulting from the cross sections' error is analyzed for a boiling LWR and a sodium-cooled reactor. The boiling LWR core shows larger sensitivity in lower energy region than the sodium-cooled reactor (especially for the energy region lower than 1kev), And, 18-group analysis that is considered acceptably good for LMFBR analysis, should not be enough for accurate sensitivity estimation of ...
*; *
JNC TJ9400 2000-004, 109 Pages, 2000/02
We estimated covariances of the JENDL-3.2 data on the nuclides and reactions needed to analyze fast-reactor cores for the past three years, and produced covariance files. The present work was undertaken to re-examine the covariance files and to make some improvements. The covariances improved are the ones for the inelastic scattering cross section of O, the total cross section of Na, the fission cross section of U, the capture cross section of U, and the resolved resonance parameters for U. Moreover, the covariances of U data were newly estimated by the present work. The covariances obtained were compiled in the ENDF-6 format.
Kawano, Toshihiko*; Osawa, Takaaki*; Shibata, Keiichi; *
JAERI-Research 99-009, 43 Pages, 1999/02
no abstracts in English
S.Oh*; Shibata, Keiichi
Journal of Nuclear Science and Technology, 35(1), p.66 - 75, 1998/01
Times Cited Count:1 Percentile:15.05(Nuclear Science & Technology)no abstracts in English
Kawano, Toshihiko*; Shibata, Keiichi
JAERI-Data/Code 97-037, 47 Pages, 1997/09
no abstracts in English
Shibata, Keiichi; Chiba, Satoshi; Fukahori, Tokio; Hasegawa, Akira; Iwamoto, Osamu; *; *; Kawano, Toshihiko*; Matsunobu, Hiroyuki*; Murata, Toru*; et al.
Proc. of Int. Conf. on Nucl. Data for Science and Technol., p.904 - 906, 1997/00
no abstracts in English
Shibata, Keiichi; Chiba, Satoshi; ; *; *; Kawano, Toshihiko*; ; Matsunobu, Hiroyuki*; *; Nakajima, Yutaka; et al.
PHYSOR 96: Int. Conf. on the Physics of Reactors, 3, p.F31 - F39, 1996/00
no abstracts in English
Nakamua, Masahiro*; Shibata, Keiichi
JAERI-Research 95-068, 51 Pages, 1995/10
no abstracts in English
Nakagawa, Tsuneo; Shibata, Keiichi; Chiba, Satoshi; Nakajima, Yutaka
JAERI-Research 95-043, 62 Pages, 1995/06
no abstracts in English
Nakajima, Yutaka
JAERI-M 94-068, 89 Pages, 1994/03
no abstracts in English
Nakazawa, Masaharu*; *; *; Iguchi, Tetsuo*; Sakurai, Kiyoshi; Ikeda, Yujiro; Nakagawa, Tsuneo
JAERI 1325, 132 Pages, 1992/03
no abstracts in English
; Ihara, Hitoshi; Yamamoto, Yoichi; Ikawa, Koji
JAERI-M 89-171, 152 Pages, 1989/11
no abstracts in English
*; *; *; ; Kikuchi, Yasuyuki
JAERI-M 86-004, 91 Pages, 1986/02
no abstracts in English
;
JAERI-M 82-193, 56 Pages, 1982/12
no abstracts in English
Iwamoto, Hiroki; Nishihara, Kenji; Katano, Ryota*; Fujimoto, Atsushi*
no journal, ,
no abstracts in English
Ishikawa, Makoto
no journal, ,
As a topic of Nuclear-data Tutorial, the author will make a lecture on the method to use nuclear-data covariance, which includes the background of nuclear-data covariance use, the physical meaning of covariance, the method to evaluate the prediction accuracy of nuclear core-parameters with covariance, and how to improve the nuclear design accuracy with covariance.