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Sasaki, Yuji; Tsubata, Yasuhiro; Kitatsuji, Yoshihiro; Sugo, Yumi; Shirasu, Noriko; Ikeda, Yasuhisa*; Kawasaki, Takeshi*; Suzuki, Tomoya*; Mimura, Hitoshi*; Usuda, Shigekazu*; et al.
JAEA-Research 2014-008, 220 Pages, 2014/06
JAEA-Research-2014-008.pdf:41.81MB
The researches on Development of mutual separation technology of minor actinides by the novel hydrophilic and lipophilic diamide compounds, entrusted to Japan Atomic Energy Agency by the Ministry of Education, Culture, Sports, Science and Technology of Japan, from 2010 to 2012 are summarized. This project was composed of three themes, those are (1) Development of total recovery of MA+Ln: basic researches for new extractant, DOODA, (2) Development of mutual separation of Am/Cm/Ln: basic researches of Ln-complex, solvent extraction, and extraction chromatography, and (3) Evaluation of separation technique: process simulation. For topic (1), we summarized the information on characteristic of DOODA extractant. For topic (2), we summarized the information on structures of Ln-complexes, solvent extraction and chromatography. For topic (3), we summarized the information on conditions of mixer-settler and evaluation of each fraction separated.
Ito, Takeshi*; Hayashi, Takumi; Isobe, Kanetsugu; Kobayashi, Kazuhiro; Yamanishi, Toshihiko
Fusion Science and Technology, 52(3), p.701 - 705, 2007/10
Times Cited Count：2 Percentile：18.73(Nuclear Science & Technology)In a fusion reactor, how to handle high concentration tritiated water (HTO) is one of the key issues for the safety control. High concentration HTO decomposes by itself, and generates hydrogen and oxygen in the gas phase and hydrogen peroxide in the liquid phase, as the final products. There are many report of the G values for water decomposition by 
-ray irradiation experiments, however, those for self-decomposition of HTO are limited because of the difficulty of the safety handling of HTO. In the Tritium Process Lab. of Japan Atomic Energy Agency, the characteristics of a wide rage of HTO up to about 2 EBq/m
has been investigated for more than 10 years. The effective G values of hydrogen and hydrogen peroxide under self-decomposition of HTO were evaluated from their concentration increase in the leak tight vessel stored HTO, as a function of time. In this paper, the above effective G values are summarized, and the dependences of HTO concentration and temperature are discussed.
Yamanishi, Takeshi; Seshimo, Kazuyoshi; Kitami, Takayuki; Tan, Sakyo*
Nihon Ryokka Kogakkai-Shi, 32(1), p.191 - 194, 2006/08
no abstracts in English
Yamanishi, Takeshi; Seshimo, Kazuyoshi; Kitami, Takayuki; Naruse, Hideo; Tan, Sakyo*
Nihon Ryokka Kogakkai-Shi, 30(1), p.227 - 230, 2004/08
Large-scale pine woods is deforested before the High-Intensity Proton Accelerator facilities construction in the Japan Atomic Energy Research Institute Tokai Research Establishment. Spraying the black pine seeds by spraying as an trial method of planting for the restoration of this forest.
Mori, Masahiro; Shoji, Teruaki; Araki, Masanori; Saito, Keiji*; Senda, Ikuo; Omori, Junji*; Sato, Shinichi*; Inoue, Takashi; Ono, Isamu*; Kataoka, Takahiro*; et al.
Nihon Genshiryoku Gakkai-Shi, 44(1), p.16 - 89, 2002/01
no abstracts in English
Ohira, Shigeru; Hayashi, Takumi; Nakamura, Hirofumi; Kobayashi, Kazuhiro; Tadokoro, Takahiro*; Nakamura, H.*; Ito, Takeshi*; Yamanishi, Toshihiko; Kawamura, Yoshinori; Iwai, Yasunori; et al.
Nuclear Fusion, 40(3Y), p.519 - 525, 2000/03
Times Cited Count：24 Percentile：59.01(Physics, Fluids & Plasmas)no abstracts in English
Yamanishi, Toshihiko; Kawamura, Yoshinori; Iwai, Yasunori; Arita, Tadaaki*; Maruyama, T.*; Kakuta, Toshiya*; Konishi, Satoshi; Enoeda, Mikio; Ohira, Shigeru; Hayashi, Takumi; et al.
Nuclear Fusion, 40(3Y), p.515 - 518, 2000/03
Times Cited Count：6 Percentile：21.01(Physics, Fluids & Plasmas)no abstracts in English
Ohira, Shigeru; Hayashi, Takumi; Nakamura, Hirofumi; Kobayashi, Kazuhiro; Tadokoro, Takahiro*; Nakamura, H.*; Ito, Takeshi*; Yamanishi, Toshihiko; Kawamura, Yoshinori; Iwai, Yasunori; et al.
Fusion Energy 1998, 3, p.1069 - 1072, 1998/10
no abstracts in English
Yamanishi, Takeshi
no journal, ,
no abstracts in English
Yamanishi, Takeshi; Sekiya, Yoshitomo; Suzuki, Tatsuya; Ito, Seiji; Kitagawa, Yoshito*; Hagihara, Takeshi*; Doi, Takashi*; Saito, Ryosuke*
no journal, ,
no abstracts in English
Inoue, Masahiro*; Nakaba, Nozomi*; Yamanishi, Takeshi; Yamakami, Masanori*; Hatakeyama, Nobuya; Yamazaki, Masanao; Sakai, Tetsuo*; Okuzono, Akihiko*
no journal, ,
The fire gas generated by a mine fire changes ventilation system by the buoyancy and the throttling effect, the adverse airflow along the roadway ceiling. As the result, the fire gas can reach upwind areas where was thought that the fire gas will never reach. These phenomena are remarkable around shafts which have large altitude differences. In order to prevent the accidents, it is important to make an accurate prediction of the behavior of ventilation air during a mine fire and the effective control of the ventilation air. However, this behavior has not been studied well so far. For this reason, the authors studied this behavior using a scaled model experiments and ascertained the major change of ventilation air. Then the effect of ventilation air control was studied. Following the results, a computer program to simulate the behavior of the fire gas by CFD method. It was confirmed that the program shows sufficient accuracy within the practical calculation time.
Yamanishi, Takeshi; Sekiya, Yoshitomo; Suzuki, Tatsuya; Kitagawa, Yoshito*; Saito, Ryosuke*; Yokota, Daisuke*
no journal, ,
no abstracts in English
Yamanishi, Takeshi; Sekiya, Yoshitomo; Inagaki, Daisuke; Hatsuyama, Yoshihiro*; Kitagawa, Yoshito*
no journal, ,
no abstracts in English
Kitagawa, Yoshito*; Minamide, Masashi*; Nayuki, Toshinori*; Yamanishi, Takeshi; Sekiya, Yoshitomo; Ito, Seiji; Sato, Haruo; Nakayama, Masashi
no journal, ,
In Japan, any high level radioactive waste repository is to be constructed at over 300m depth below surface. Tunnel support is used for safety during the construction and operation, and shotcrete and concrete lining are used as the tunnel support. Concrete is a composite material comprised of aggregate, cement and various additives. Low alkaline cement has been developed for the long term stability of the barrier systems whose performance could be negatively affected by highly alkaline conditions arising due to cement used in a repository. Japan Atomic Energy Agency (JAEA) has developed a low alkaline cement, named as HFSC (High fly-ash silicafume cement), containing over 60wt% of silica-fume (SF) and coal ash (FA). JAEA are presently constructing an underground research laboratory (URL) at Horonobe for research and development in the geosciences and repository engineering technology. HFSC was used experimentally as the shotcrete material in construction of part of the 140m deep gallery in Horonobe URL. The objective of this experiment was to assess the performance of HFSC shotcrete in terms of mechanics, workability, durability, and so on. HFSC used in this experiment is composed of 40wt% OPC (Ordinary Portland Cement), 20wt% SF, and 40wt% FA. This composition was determined based on mechanical testing of various mixes of the above components. Because of the low OPC content, the strength of HFSC tends to be lower than that of OPC in normal concrete. The total length of tunnel using HFSC shotcrete is about 73m and about 500m of HFSC was used. This experimental construction confirmed the workability of HFSC shotcrete. Although several in-situ experiments using low alkaline cement as shotcrete have been performed at a small scale, this application of HFSC at the Horonobe URL is the first full scale application of low alkaline cement in the construction of a URL in the world.
Yamanishi, Takeshi; Sekiya, Yoshitomo; Sataka, Hiroyuki; Kitagawa, Yoshito*; Kato, Kinya*
no journal, ,
no abstracts in English
Yamanishi, Takeshi; Sekiya, Yoshitomo; Suzuki, Tatsuya; Kitagawa, Yoshito*; Kato, Kinya*; Saito, Ryosuke*
no journal, ,
no abstracts in English
Sekiya, Yoshitomo; Shimoyama, Tadashi; Anada, Hideki*; Kanatani, Tsugio*; Yamanishi, Takeshi
no journal, ,
no abstracts in English
Sekiya, Yoshitomo; Shimoyama, Tadashi; Hirakawa, Yoshiaki*; Narashima, Yoshimasa*; Yamanishi, Takeshi
no journal, ,
no abstracts in English
Sasaki, Yuji; Tsubata, Yasuhiro; Kitatsuji, Yoshihiro; Sugo, Yumi; Shirasu, Noriko; Ikeda, Yasuhisa*; Kawasaki, Takeshi*; Mimura, Hitoshi*; Usuda, Shigekazu*; Yamanishi, Kei*
no journal, ,
no abstracts in English
