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Niwa, Masakazu; Nomura, Katsuhiro; Hiura, Yuki
JAEA-Review 2018-010, 40 Pages, 2018/04
JAEA-Review-2018-010.pdf:6.11MB
JAEA-Review-2018-010-appendix(CD-ROM).zip:36.31MB
In the Japanese Islands, coastal area can be proposed as an investigation site for geological disposal of high-level radioactive wastes. For an assessment of fault activity in coastal area, offshore surveys such as acoustic profiling and boring should be examined as well as inland surveys. In addition, adequate understanding spatial distributions and characteristics of faults in the coastal area of Japan will contribute to safety assessment for the geological disposal in such area. In this report, we collected and compiled previous studies focused on spatial distribution, continuity, timing of displacement and recurrence interval of faults near coastline, specifically faults along or across a boundary between land and sea, and technologies of survey and assessment for them.
Otani, Hiroshi; Mizui, Hiroyuki; Higashiura, Norikazu; Bando, Fumio*; Endo, Nobuyuki*; Yamagishi, Ryuichiro*; Kume, Kyo*
Heisei-25-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 16, P. 66, 2014/10
no abstracts in English
Nishiura, Masaya*; Toba, Shiori*; Takao, Daisuke*; Miyashiro, Daisuke*; Sakakibara, Hitoshi*; Matsuo, Tatsuhito; Kamimura, Shinji*; Oiwa, Kazuhiro*; Yagi, Naoto*; Iwamoto, Hiroyuki*
Journal of Structural Biology, 178(3), p.329 - 337, 2012/06
Times Cited Count：3 Percentile：8.29(Biochemistry & Molecular Biology)We report the first X-ray diffraction patterns recorded from single axonemes of eukaryotic flagella with a diameter of only 
0.2 
m, by using the technique of cryomicrodiffraction. A spermatozoon isolated from Drosophila melanogaster, was mounted straight in a glass capillary, quickly frozen and its 800-m segment was irradiated end-on with intense synchrotron radiation X-ray microbeams (diameter, 2 m) at 74 K. Well-defined diffraction patterns were recorded, consisting of a large number of isolated reflection spots. The patterns had features of an 18-fold rotational symmetry as expected from the axonemal structure. The diffraction patterns were compared with the results of model calculations based on a published electron micrograph of the Drosophila axoneme. The comparison provided information on the native state of axoneme, including estimates of axonemal diameter and interdoublet spacing.
Aizawa, Hideyuki*; Katagiri, Genichi*; Sano, Kazuya; Higashiura, Norikazu
Fuji Denki Homu Peji and Fuji Denki America Sha Homu Peji (Internet), 11 Pages, 2012/04
In a nuclear power plant, spent IXR (hereafter called SR), low-level radioactive waste, is produced from water purification systems in association with the operation of the plant. These SR are different in a radioactive concentration depending on purification systems, and SR which is relatively higher in the radioactivity concentration is stored in the nuclear power plant. Stored amounts continue to increase year after year. In Japan, it is planned that SR will be buried in the ground in the future as a "waste solid" which is solidified in a specific metal container. In terms of securing long-term soundness of the waste solids, it is said the solidification of the SR is required after stabilization treatment is performed. Moreover, SR with high radioactivity concentration requires higher disposal expenses; therefore, the reduction of the disposal volume is required in terms of cost-cutting. To realize these requirements, processing technologies are required which satisfy both the volume reduction and stabilization of the SR at once. Fuji Electric is continuing to develop LPOP technology and the equipment (FRR: Fuji Resin Reducer) as technologies to respond to these requirements. LPOP treatment is a technology enabling realization of both volume reduction and stabilization of SR which is low-level radioactive waste. Fuji Electric post the overview of LPOP technology and the results of mineralization of ion exchange resin and solidification tests executed for the purpose of evaluating the effect of LPOP treatment aiming the burial disposal on our website.
Hamada, Nobuyuki; Watanabe, Junji; Higashiura, Norikazu; Shime, Masanori
Dekomisshoningu Giho, (45), p.2 - 9, 2012/03
The manual type wet blast apparatus had been introduced to remove the surface contaminations of the radioactive waste, as the preprocessing for the clearance. Decontamination test had been carried out to survey the optimum condition for the decontamination with using specimens obtained from facilities and equipments which will be planned to be cleared. As the results, we confirmed that the apparatus has the performance to reduce the surface radioactive concentration on the inside of the tube to under the clearance level within relatively short time.
Isobe, Mitsutaka*; Toi, Kazuo*; Matsushita, Hiroyuki*; Goto, Kazuyuki*; Suzuki, Chihiro*; Nagaoka, Kenichi*; Nakajima, Noriyoshi*; Yamamoto, Satoshi*; Murakami, Sadayoshi*; Shimizu, Akihiro*; et al.
Nuclear Fusion, 46(10), p.S918 - S925, 2006/10
Times Cited Count：31 Percentile：69.16(Physics, Fluids & Plasmas)no abstracts in English
Hiura, Nobuo*; Yamaura, Takayuki; Motohashi, Yoshinobu*; Kobiyama, Mamoru*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 1(2), p.202 - 208, 2002/06
The purpose of this study is to develop oxygen sensor which can measure the oxygen potential of the fuel in a nuclear reactor. The oxygen sensor with CaO stabilized zirconia solid electrolyte has been specially designed in order to prolong its life time. Electromotive force (EMF) of solid galvanic cell Ni/NiO|ZrO
-CaO|Fe/FeO was measured in both the out-pile tests and the in-situ tests using Japan Material Testing Reactor (JMTR), and the characteristics of EMF was discussed. In the out-pile test, it was found that the EMF was almost equal to the theoretical values at temperatures ranging from 700 to 1,000
, and the life span of the sensor was very long up to 980h at 800. In the in-situ test, it was found that the EMF showed almost the reliable values up to 300 h (neutron fluence (E 
1 MeV) 1.5
10
m
), at temperatures from 700 to 900. The imprecision of the EMF was found to be within 6% of the theoretical values up to 1,650 h irradiation time (neutron fluence (E 1 MeV) 8.010 m) at 800. The oxygen sensors were found to be applicable for the oxygen potential measurement of the fuels in a reactor.
山本 耕輔; 川越 慎司; 東浦 則和; 水井 宏之
not registered
JP, 2020-055379 Patent licensing information Patent publication (In Japanese)
【課題】評価の保守性の観点から放射能濃度を適切に評価することができる放射能評価方法を提供する。 【解決手段】放射能評価方法は、測定対象物の放射能濃度を算定する放射能濃度算定工程(S4)と、放射能濃度の相対誤差σ'Dを算定する誤差算定工程(S5)と、放射能濃度の相対誤差σ'Dに基づく不確定性を考慮して放射能濃度を評価する評価工程(S6)とを含み、誤差算定工程(S5)は、グロス計数率の測定プロセスに起因する複数のグロス誤差を重畳してグロス計数率の誤差σCGを算定するグロス誤差算定工程(S51)と、測定BG計数率の測定プロセス及び推定BG計数率の推定プロセスに起因する複数のBG誤差を重畳して推定BG計数率の誤差σCBGを算定するBG誤差算定工程(S52)と、グロス計数率の誤差σCGと、推定BG計数率の誤差σCBGとに基づいて、正味計数率の相対誤差σ'CNを算定する正味計数率誤差工程(S53)とを含む。
山本 耕輔; 川越 慎司; 東浦 則和; 水井 宏之
not registered
JP, 2020-057662 Patent licensing information Patent publication (In Japanese)
【課題】評価の保守性の観点から放射能特性を適切に評価することができる放射能評価方法を提供する。 【解決手段】放射能評価方法は、グロス計数率CGが測定される前の第1のBG計数率CBG1と、グロス計数率CGが測定された後の第2のBG計数率CBG2との差分であるBG計数率変動量ΔCBGを算定するBG変動量算定工程(S4)と、第1のBG計数率CBG1及び第2のBG計数率CBG2の測定に含まれる複数の誤差要因に起因する複数のBG誤差を重畳することによりBG計数率変動量ΔCBGの誤差σΔCBGを算定するBG変動誤差算定工程(S5)と、BG計数率変動量ΔCBGの誤差σΔCBGに基づいて、BG計数率変動量ΔCBGとして許容されるBG計数率許容変動量ΔCBGLを算定し、当該BG計数率許容変動量ΔCBGLを用いてBG計数率変動量ΔCBGを評価して、測定作業の有効性を判定する有効性判定工程(S6)とを含む。
Komatsu, Tetsuya; Takahashi, Takayuki*; Funatsu, Taro*; Muraki, Masahiro*; Hiura, Yuki; Sugai, Toshihiko*
no journal, ,
no abstracts in English
Komatsu, Tetsuya; Hiura, Yuki; Takahashi, Takayuki*; Funatsu, Taro*; Muraki, Masahiro*; Kimori, Taiga*; Sugai, Toshihiko*
no journal, ,
no abstracts in English
Hiura, Yuki; Kawamura, Makoto; Umeda, Koji*; Niwa, Masakazu
no journal, ,
One of the technical issues related to volcanic and igneous activities is the sophistication of technology for grasping the range of influence of magma. To address this issue, it is important to accumulate survey cases, especially when the dike develops over a radius of 15 km from the center of the Quaternary volcano, but it lies beneath the existing volcanic body. It is practically difficult to grasp the distribution of the conduits and the dikes derived from them. Therefore, the purpose of this study was to develop a method for estimating the distribution range of dikes distributed under the Quaternary volcanic body based on topographical data such as digital elevation models. In this study, we used digital maps and GIS software to target six volcanoes, such as stratovolcanoes and calderas. The parameters were measured, and modeling of the three-dimensional distribution range of radial dikes was examined from each parameter for each altitude. As a result, the transition of the center of gravity position for each altitude suggests the transition of the center of activity in the process of forming the volcanic body to some extent, and it is possible to extract not only the activity of the central crater but also the activity of lateral volcanoes. This suggests the possibility of quantitative evaluation of the transition and stability of the conduit even in volcanoes whose activity history is not clear by applying this method.
Komatsu, Tetsuya; Hiura, Yuki; Izumida, Atsuto*; Takahashi, Takayuki*; Funatsu, Taro*; Muraki, Masahiro*; Hozo, Renya*; Sugai, Toshihiko*
no journal, ,
no abstracts in English
Suzuki, Shizuo*; Nagai, Masaru*; Koarashi, Jun; Atarashi-Andoh, Mariko; Yokozawa, Masayuki*; Hara, Toshihiko*; Hiura, Tsutomu*; Watanabe, Hiroshi*; Namimatsu, Kanae*; Tako, Yasuhiro*; et al.
no journal, ,
no abstracts in English
Hamada, Nobuyuki; Watanabe, Junji; Higashiura, Norikazu; Shime, Masanori
no journal, ,
no abstracts in English
Maekawa, Keisuke; Hara, Akio*; Hiura, Yuki*; Hou, J.-Y.*; Kato, Arata*
no journal, ,
no abstracts in English
Hiura, Yuki; Komatsu, Tetsuya; Sugai, Toshihiko*
no journal, ,
no abstracts in English
- 10
years in the Japanese IslandsHiura, Yuki; Komatsu, Tetsuya; Sueoka, Shigeru; Kitamura, Yo*; Sanga, Tomoji*
no journal, ,
Distribution map of erosion rates on geological timescales should be prepared to evaluate the long-term stability of geological environments. Previous distribution maps of erosion rates were constructed based on deposition rates in artificial dams on multi-decadal timescales. This study aims to construct a new distribution map of erosion rates on timescales of 10 - 10 years by using reported data derived from terrestrial cosmogenic nuclide (TCN) methods. This study presents the method for constructing the new distribution map of erosion rate and the results of comparing it with the previous one.
Mizui, Hiroyuki; Otani, Hiroshi; Higashiura, Norikazu; Onozaki, Kimihiro*; Katagiri, Genichi*; Endo, Nobuyuki*; Ogawa, Hideo*; Kaneda, Yoshihisa*
no journal, ,
The applicable prospect for spent resin disposal including inhibitor was acquired by basic test of using low pressure oxygen plasma method.
Otani, Hiroshi; Higashiura, Norikazu; Mizui, Hiroyuki; Endo, Nobuyuki*; Katagiri, Genichi*; Oshio, Tadashi*; Ogawa, Hideo*
no journal, ,
no abstracts in English
