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Maeda, Makoto; Furutaka, Kazuyoshi; Ozu, Akira; Komeda, Masao; Toh, Yosuke
no journal, ,
no abstracts in English
Iwamoto, Nobuyuki; Iwamoto, Osamu; Nakamura, Shoji; Kimura, Atsushi; Katabuchi, Tatsuya*; Rovira Leveroni, G.*
no journal, ,
no abstracts in English
Kimura, Atsushi; Nakamura, Shoji; Iwamoto, Nobuyuki; Iwamoto, Osamu; Katabuchi, Tatsuya*; Terada, Kazushi*; Rovira, G.*; Hori, Junichi*; Shibahara, Yuji*
no journal, ,
no abstracts in English
Omer, M.; Shizuma, Toshiyuki*; Hajima, Ryoichi*; Koizumi, Mitsuo
no journal, ,
Iwamoto, Osamu; Kunieda, Satoshi; Furutachi, Naoya*; Minato, Futoshi; Iwamoto, Nobuyuki; Nakayama, Shinsuke; Ebata, Shuichiro*; Nishihara, Kenji; Yoshida, Toru*; Watanabe, Yukinobu*; et al.
no journal, ,
Treatment of high-level radioactive wastes produced by reactor operation is are very important problem for nuclear energy. A new nuclear data library JENDL/ImPACT-2018 has been developed as a part of the ImPACT project aiming at reduction and resource recycling of LLFPs through nuclear transmutation. Due to possible creation of a lot of secondary products including unstable nuclei, the nuclear reaction data have been evaluated with improving predictability of theoretical calculations.
Malins, A.; Imamura, Naohiro*; Niizato, Tadafumi; Kim, M.; Sakuma, Kazuyuki; Shinomiya, Yoshiki*; Miura, Satoru*; Machida, Masahiko
no journal, ,
Kondo, Ryoichi*; Endo, Tomohiro*; Yamamoto, Akio*; Tada, Kenichi
no journal, ,
The random sampling module for ACE format cross sections are developed using modules of FRENDY. This module perturbs the cross sections and other parameters in ACE format cross section library using covariance data. The GODIVA reactor is used and the calculation results of TSUNAMI-1D are compared to verify this module.
Nishioka, Shunichiro; Takase, Gaku; Nakajima, Kunihisa; Suzuki, Eriko; Osaka, Masahiko
no journal, ,
The chemical/physical properties of Cs-chemisorbed deposit could change along with the progression of LWR severe accident (SA). In this study, the influence of temperature change on the properties of Cs-chemisorbed deposit was investigated experimentally. It was found that Cs-Fe-O compounds, which had been formed by chemisorption at 873 K, could transform into Cs-Si-(Fe)-O compounds at 1273 K.
Motokawa, Ryuhei; Kobayashi, Toru; Endo, Hitoshi
no journal, ,
no abstracts in English
Furuta, Takuya; El Basha, D.*; Iyer, S. S. R.*; Correa Alfonso, C. M.*; Bolch, W. E.*
no journal, ,
With recent changes in the recommended annual dose limit on eye lens by International Commission on Radiological Protection, several Monte Carlo studies has been performed using a computational eye model. Although there are a large variety in size and shape for individual eyes, the eye model of one standard eye size and shape was adopted in most of those studies. We therefore constructed a geometric eye model that is both scalable and deformable, and studied dosimetry influence on the variation of the eye size and shape in the standard radiation geometries using Monte Carlo radiation transport code PHITS. We confirmed that only a trivial dependence on the eye size and shape, namely variation of the depth location of the ocular structures, was observed for radiation exposure in the broad radiation geometries.
Abe, Tomohisa; Yoshimura, Kazuya; Sanada, Yukihisa
no journal, ,
In this study, we analyzed the variation trend of cesium concentration in the atmosphere using a data set that the Nuclear Regulation Authority regular measured the atmospheric radioactivity after the Fukushima Nuclear Plant Accident. In addition, we calculated re-suspension factor in Fukushima using the initial fallout map of cesium by the third airborne monitoring survey.
Yamamoto, Masahiko; Do, V. K.; Taguchi, Shigeo; Takamura, Yuzuru*; Kuno, Takehiko
no journal, ,
The measurement conditions of Na, K, Ca, Sr, Ba by liquid electrode plasma optical emission spectrometry (LEP-OES) have been optimized. The samples from reprocessing process plant such as highly active liquid waste has been also measured by LEP-OES.
Ueki, Taro
no journal, ,
The randomized Weierstrass function (RWF) is a useful tool for the uncertainty evaluation of the criticality of disordered media. This excerpt reports the extension of RWF methodology covering a wide range of power law spectra in order to simulate various disordered mixtures of materials. The extended RWF is then demonstrated using the Monte Carlo Solver Solomon.
Tada, Kenichi
no journal, ,
The ladder number has large impact on the probability table generation time. In this paper, we investigate the appropriate ladder number to generate probability table. The calculation results indicate that the appropriate ladder number to generate probability table is 100.
Kakiuchi, Kazuo; Narukawa, Takafumi; Obata, Hiroki; Amaya, Masaki
no journal, ,
JAEA has conducted studies on fuel behaviors during loss-of-coolant-accidents (LOCA) using high-burnup advanced fuel cladding tubes. We report the evaluation results on the effects of the burnup extension and the change in the alloy compositions on high temperature oxidation of high-burnup advanced fuel cladding.
Amaya, Masaki; Ito, Masatoshi; Komuro, Kazuma
no journal, ,
no abstracts in English
Katabuchi, Tatsuya*; Iwamoto, Osamu; Hori, Junichi*; Iwamoto, Nobuyuki; Kimura, Atsushi; Nakamura, Shoji; Shibahara, Yuji*; Terada, Kazushi*; Takamiya, Koichi*; Fukutani, Satoshi*; et al.
no journal, ,
Accurate neutron capture cross sections on long-lived MA at fast region are required for developments of nuclear transmutation system. A study to improve accuracy of the fast neutron capture cross sections has been started as a collaborative project among Tokyo Institute of Technology, Japan Atomic Energy Agency and Kyoto University since 2017. This talk reports about the background, the object and the total plan of the project as the first one of the series presentations.
Koura, Hiroyuki; Katakura, Junichi*; Tachibana, Takahiro*; Minato, Futoshi
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no abstracts in English
Shibahara, Yuji*; Hori, Junichi*; Fukutani, Satoshi*; Takamiya, Koichi*; Katabuchi, Tatsuya*; Terada, Kazushi*; Iwamoto, Osamu; Iwamoto, Nobuyuki; Kimura, Atsushi; Nakamura, Shoji
no journal, ,
As a part of the Nuclear System Research and Development Project "Study on accuracy improvement of fast-neutron capture reaction data of long-lived MA for development of nuclear transmutation systems", developments of the technology mainly using the mass spectroscopy method for the isotope and impurity analysis in samples. This presentation reports status of the study on the analysis technology with the surface ionization type mass spectroscopy device.
Furutaka, Kazuyoshi; Toh, Yosuke
no journal, ,
no abstracts in English