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Yamano, Hidemasa; Nishino, Hiroyuki; Kurisaka, Kenichi; Okano, Yasushi; Takata, Takashi; Sakai, Takaaki; Yamamoto, Takahiro*; Ishizuka, Yoshihiro*; Furukawa, Ryuta*; Geshi, Nobuo*; et al.
no journal, ,
PRA and margin assessment methodologies have been developed for sodium-cooled fast reactors against representative external hazards. This report describes the overview of last year (JPY2015) updates and the development of the sequence assessment methodology against a combination hazard of strong wind and rainfall.
Kunieda, Satoshi
no journal, ,
Evaluated cross-sections are fundamental quantities for nuclear science and engineering. In the resonance region, experimental activity is being increased using the J-PARC facility to measure the neutron cross-sections on the isotopes including LLFP and MA in this country. However, for the analysis/evaluation of measured data, we are still relying on the foreign codes which have advantages and disadvantages on the theoretical calculation and correction for the experimental conditions. The purpose of this work is to develop a new analysis code based on the R-matrix theory with high applicability and extensibility to the experimental conditions, by modifying an existing code AMUR. In this talk, we present current status of the code development on the calculation of the capture cross-sections and options for correction to measured data, together with some example analysis for the neutron cross-sections.
Okano, Yasushi; Yamano, Hidemasa
no journal, ,
For an evaluation of a combination hazard curve of forest fire and thunder, it is necessary to take into account not only the overlap occurrence frequency but also meteorological effect on a forest fire intensity. The logic tree of a forest fire hazard curve evaluation was utilized in this study for quantitative estimation of the hazard curve of the combination event of forest fire and thunder.
Nagaishi, Ryuji; Kondo, Takafumi*; Godo, Masao*; Yoshida, Yoichi*; Inoue, Masao
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no abstracts in English
Ozu, Akira; Maeda, Makoto; Komeda, Masao; Tobita, Hiroshi; Kureta, Masatoshi
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no abstracts in English
Yokoyama, Kenji; Jin, Tomoyuki
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no abstracts in English
Nakane, Yoshihiro; Iwamoto, Yosuke; Hagiwara, Masayuki*; Iwase, Hiroshi*; Nunomiya, Tomoya*; Sato, Tatsuhiko; Matsumoto, Tetsuro*; Masuda, Akihiko*; Yashima, Hiroshi*; Nakamura, Takashi*; et al.
no journal, ,
no abstracts in English
Imaizumi, Yuya; Kamiyama, Kenji; Matsuba, Kenichi; Isozaki, Mikio; Suzuki, Toru; Emura, Yuki
no journal, ,
For the study of the fuel-coolant interaction and deposition behavior of the molten core material on the in-vessel structure in the relocation phase of the core disruptive accident in SFR, several experiments discharging low-melting-point alloy into a shallow water pool were conducted. The experimental results and the mechanism discussion are reported.
Nakamura, Shoji; Kimura, Atsushi; Hales, B. P.; Iwamoto, Osamu; Tsubata, Yasuhiro; Matsumura, Tatsuro
no journal, ,
As a part of research items on ImPACT Project, nuclear data research group of JAEA has performed the research on neutron capture cross-section measurements of Cs isotopes, especially Cs-135. This presentation gives an outline of research plans and their progress.
Furutachi, Naoya; Minato, Futoshi; Iwamoto, Osamu
no journal, ,
The nuclear level density is essential for nuclear reaction calculations using the statistical model and pre-equilibrium models. Phenomenological Fermi gas models have been used widely for calculations of the nuclear level density, however, reliability of them depend on the parameter adjustment to reproduce the experimental informations of the s-wave neutron resonance spacing D0, and therefore, calculations using more microscopic models are desirable for unstable nuclei that have no available experimental information. The microscopic statistical models and combinatorial models based on Hartree-Fock theory are models that can reproduce the experimental D0 with precisions comparable to the phenomenological models. However, these calculations are strongly dependent on the strength of the pairing interaction, and its uncertainty affect to the precision of the calculations. Therefore, in this work, we improved the treatment of the pairing interaction in the nuclear structure calculation, and analyzed how the pairing interaction affect to the precision of the nuclear level density calculation.
Nagaya, Yasunobu; Tada, Kenichi
no journal, ,
no abstracts in English
rays emitted from 
Np sources with using TES microcalorimetersYasumune, Takashi; Takasaki, Koji; Ito, Chikara; Ono, Masashi*; Irimatsukawa, Tomoya*; Takahashi, Hiroyuki*
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no abstracts in English
Nakamichi, Shinya; Hirooka, Shun; Kato, Masato; Sunaoshi, Takeo*; Nelson, A.*; McClellan, K.*
no journal, ,
Sintering behavior of (U
Ce
)O was estimated and compared with that of MOX. Sintering of (UCe)O in CO was not accelerated in contrast with that of MOX.
Nishina, Masahiro; Hirooka, Shun; Morimoto, Kyoichi
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no abstracts in English
CsHales, B. P.; Nakamura, Shoji; Kimura, Atsushi; Iwamoto, Osamu
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no abstracts in English
Saito, Kimiaki; Mikami, Satoshi; Ando, Masaki; Matsuda, Norihiro; Tsuda, Shuichi; Yoshida, Tadayoshi; Yoshimura, Kazuya; Sato, Tetsuro*; Kanno, Takashi; Yamamoto, Hideaki
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no abstracts in English
Ohgama, Kazuya; Ikeda, Kazumi*; Ishikawa, Makoto; Kan, Taro*; Oki, Shigeo
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no abstracts in English
Ikeda, Kazumi*; Kan, Taro*; Maruyama, Shuhei; Ohgama, Kazuya
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no abstracts in English
Tsuda, Shuichi; Tanigaki, Minoru*; Saito, Kimiaki
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A GPS-aided radiation monitoring system KURAMA and the KURAMA-II developed by Kyoto University has been utilized after the Fukushima Dai-ichi Nuclear Power Plant accident in a mapping project of radionuclides deposited in the environment and monitoring of dose rates in air. KURAMA-II has a function of precisely evaluating dose rates in air based on measured pulse-height spectra from the incorporated CsI(Tl) scintillation detector. In this study, to evaluate dose contribution of the radionuclides in the environment, photon energy spectra was estimated by an unfolding method, using the measured pulse-height spectra and the dataset of the calculated response functions of the CsI(Tl) scintillation detector in a simulative environment. The results of dose contributions of artificial and natural radionuclides based on the estimation method will be reported in the session, "Mapping project in Fukushima and related researches".
Yokozuka, Yuta; Mimura, Ryuji; Fujikura, Toshiki; Nemoto, Koichi; Shida, Shigeo
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no abstracts in English