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Miyahara, Naoya; Miwa, Shuhei; Horiguchi, Naoki; Sato, Isamu*; Osaka, Masahiko
Journal of Nuclear Science and Technology, 56(2), p.228 - 240, 2019/02
Times Cited Count：11 Percentile：65.48(Nuclear Science & Technology)In order to improve LWR source term under severe accident conditions, the first version of a fission product (FP) chemistry database named "ECUME" was developed. The ECUME is intended to include major chemical reactions and their effective kinetic constants for representative SA sequences. It is expected that the ECUME can serve as a fundamental basis from which FP chemical models in the SA analysis codes can be elaborated. The implemented chemical reactions in the first version were those for representative gas species in Cs-I-B-Mo-O-H system. The chemical reaction kinetic constants were evaluated from either literature data or calculated values using ab-initio calculations. The sample chemical reaction calculation using the presently constructed dataset showed meaningful kinetics effects at 1000 K. Comparison of the chemical equilibrium compositions by using the dataset with those by chemical equilibrium calculations has shown rather good consistency for the representative Cs-I-B-Mo-O-H species. From these results, it was concluded that the present dataset should be useful to evaluate FP chemistry in Cs-I-B-Mo-O-H system under LWA SA conditions.
Ikeda, Takashi; Hou, Z.*; Chai, G.-L.*; Terakura, Kiyoyuki*
Journal of Physical Chemistry C, 118(31), p.17616 - 17625, 2014/08
Times Cited Count：53 Percentile：78.76(Chemistry, Physical)N-doped carbon-based nanomaterials are attracting a great interest as promising Pt-free electrode catalysts for polymer electrolyte fuel cells (PEFCs). In this computational study, we demonstrate that N-doped graphene edges can exhibit enhanced catalytic activity toward oxygen reduction reactions by controlling their electron-donating and -withdrawing abilities, and basicity, resulting in higher selectivity of 4e
reduction via inner and outer sphere electron transfer at edges in acidic conditions, respectively. Our simulations also show that 2e reduction occurs selectively in the presence of pyridinic N next to carbonyl O at zigzag edges. This study thus rationalizes the roles of doped N in graphenelike materials for oxygen reduction reactions.
Nd method of evaluation of burnup for the PIE samples from Mihama-3 and Genkai-1 reactorsSuyama, Kenya; Mochizuki, Hiroki*
Annals of Nuclear Energy, 33(4), p.335 - 342, 2006/03
Times Cited Count：10 Percentile：55.12(Nuclear Science & Technology)The value of the burnup is one of the most important parameters of samples taken by post irradiation examination (PIE). In this study, concerning the PIE data from Mihama-3 and Genkai-1 PWRs, which were taken at the Japan Atomic Energy Research Institute, the burnup values of the PIE samples were re-evaluated and the PIE data are re-analyzed using SWAT and SWAT2 code systems with JENDL-3.3 library. This analysis concludes that the burnup values of samples from Mihama-3 and Genkai-1 PWRs should be corrected of 2-3%. The effect of re-evaluation of the burnup value on the neutron multiplication factor is approximately 1% for PIE samples having the burnup of larger than 30 GWd/t. Comparison between calculation results using a single pin cell model and an assembly model is carried out. Because the both results agreed within a few percents, we concluded that the single pin cell model is suitable for the analysis of PIE samples and the underestimation of plutonium isotopes does not result from the geometry model.
Si up to 200 MeV based on the soft rotator modelSun, W.*; Watanabe, Yukinobu*; Sukhovitskij, E.*; Iwamoto, Osamu; Chiba, Satoshi
Journal of Nuclear Science and Technology, 40(9), p.635 - 643, 2003/09
Times Cited Count：11 Percentile：57.86(Nuclear Science & Technology)A consistent analysis for nuclear level structure and nucleon scattering data up to 200 MeV were performed for sd-shell nuclei, Si, using a unified framework of soft-rotator model and coupled-channels approach. The soft-rotator model parameters and optical model parameters were derived. The calculations showed good agreement with experimental data for both collective level and nucleon interaction data -- neutron total cross sections, proton reaction cross sections, and nucleon scattering angular distributions.
fusion yield in higher harmonic ICRF heated plasmaYamagiwa, Mitsuru; Kimura, Haruyuki; Takizuka, Tomonori; Fujii, Tsuneyuki
Proc. of the 17th EPS Conf. on Controlled Fusion and Plasma Heating, p.1007 - 1010, 1990/00
no abstracts in English
Tsuchihashi, Keichiro; Akino, Fujiyoshi
Journal of Nuclear Science and Technology, 24(12), p.1055 - 1065, 1987/12
Times Cited Count：3 Percentile：37.55(Nuclear Science & Technology)no abstracts in English
Mn; Gamow-Teller quenching in fp-shell nuclei; J.Cerny*; R.Kirchner*; O.Klepper*; V.T.Koslowsky*; A.Plochocki*; E.Roeckl*; D.Schardt*; B.Sherrill*
Nuclear Physics A, 467, p.93 - 114, 1987/00
Times Cited Count：32 Percentile：82.85(Physics, Nuclear)no abstracts in English
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Hoken Butsuri, 20(2), p.109 - 119, 1985/00
no abstracts in English
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JAERI-M 82-091, 67 Pages, 1982/07
no abstracts in English
; ; ; ; Iida, Hiromasa
JAERI-M 8247, 89 Pages, 1979/05
no abstracts in English
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JAERI-M 8229, 62 Pages, 1979/05
no abstracts in English
; ; ; ; ;
JAERI-M 6954, 42 Pages, 1977/02
no abstracts in English
Thwe Thwe, A.; Nagaishi, Ryuji; Furukawahara, Ryo; Ito, Tatsuya
no journal, ,
For hydrogen safety in the storage of wet radioactive materials under the decommissioning process of nuclear power stations including 1F, not only the experimental but also analytical studies on hydrogen generation from water radiolysis are important. Until now, we have conducted those closely related to the 1F decommissioning by the experiments for the effects of seawater salts, liquid depth and temperature, and by the calculations for the effect of liquid flow. In this study, we calculated the liquid-depth effect on hydrogen generation by using a one-dimensional reaction model in the vertical direction based on the open-source software CANTERA. The division of reaction cells was found to be important. As the division number increased, the slope of the increase in the amount of hydrogen generated with respect to the absorbed dose became smaller, approaching to the experimental results. However, when the number exceeded 100, the calculation results were underestimated under the current experimental and calculation conditions.
