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Nakamura, Hirofumi; Higashijima, Satoru
Shinku, 49(2), p.62 - 68, 2006/02
no abstracts in English
Fukada, Satoshi*; Hayashi, Takumi
Nihon Genshiryoku Gakkai-Shi, 47(9), p.623 - 629, 2005/09
no abstracts in English
Iwai, Yasunori; Yamanishi, Toshihiko; Hayashi, Takumi; Nishi, Masataka
Fusion Science and Technology, 48(1), p.456 - 459, 2005/07
Times Cited Count：3 Percentile：24.22(Nuclear Science & Technology)Addition of gas separation membrane process into usual tritium removal process from atmosphere in a room is attractive for fusion plants where a large amount of atmosphere should be processed. Therefore, the gas separation membrane has been studied. New concept of membrane separation with reflux flow is proposed in the present. Driving force of membrane separation is the difference of partial pressure through membrane. Hence, reflux of a part of gases at permeated side to feed side enhances driving force. Essential points of present discussion are as follows: (1) Reflux has plus effect of driving force enhancement and minus effect of feed flow increase, hence, there is the optimum. (2) Permeated-side pressure effects enhancement of tritium recovery strongly. (3) Effect of reflux becomes striking as the target species have higher permeability coefficient, therefore, it is favorable for tritium recovery because those of hydrogen gas and water vapor are much higher among atmosphere elements. In addition, application of reflux flow will realize scale reduction of expensive membrane module.
Ichimasa, Michiko*; Awagakubo, Sayuri*; Takahashi, Miho*; Tauchi, Hiroshi*; Hayashi, Takumi; Kobayashi, Kazuhiro; Nishi, Masataka; Ichimasa, Yusuke*
Fusion Science and Technology, 48(1), p.759 - 762, 2005/07
Times Cited Count：7 Percentile：44.9(Nuclear Science & Technology)There exists various kinds of HT oxidizing soil bacteria in the world, and we have conducted the investigation of HT oxidation activity of such bacteria. In the fusion facility where deuterium and tritium will be used as its fuel, the system is necessary to eliminate tritium from atmospheric air. General tritium elimination method is oxidation and dehumidification, and high temperature catalyst is used in the present system for oxidation. Application of the HT oxidation bioreactor, which can oxidize in room temperature, to this oxidation process has possibility to get higher tritium elimination efficiency, so we started to study the bioreactor. In the recent study, we can get high oxidation ratio of 85% in the processing conditions of 200 Bq/cm
as tritium concentration in air, 100 cm/min as flow rate and once-through processing using the Caisson Assembly for Tritium Safety Study (CATS) in JAERI. This result encourages this development study.
Konishi, Satoshi
Purazuma, Kaku Yugo Gakkai-Shi, 78(11), p.1157 - 1164, 2002/11
Based on the fundamental approach for safety of ITER, possible extension to assure safety of fusion power plant was considered. Although the entire analysis and licensing preparation are specific for ITER, its methodology that take full advantage of inherent feature of fusion is expected to be applied to fundamental logic of fusion power plant. Both energy and radioactive source terms that could be potential hazards are typically of order of days of operation rather than a year in the case of fission. Major difference from the test reactor ITER identified was power blanket, coolant loop and generator train that will hold high temperature and considerable amount of tritium. It is anticipated that tritium inventory and most of the tritium safety plant would essentially be same as ITER, tritium recovery and removal from blanket loop will dominate the fusion power plant tritium systems. Such a tritium system will actively remove tritium at the daily throughput comparable with the order of plant inventory. This feature suggest no dedicated off-normal systems are needed to assure safety of fusion plant from the aspect of environmental tritium release.
Kobayashi, Kazuhiro; Hayashi, Takumi; Iwai, Yasunori; Asanuma, Noriko; Nishi, Masataka
Fusion Science and Technology, 41(3), p.673 - 677, 2002/05
no abstracts in English
Kobayashi, Kazuhiro; Hayashi, Takumi; Iwai, Yasunori; Nishi, Masataka
Fusion Engineering and Design, 58-59, p.1059 - 1064, 2001/11
Times Cited Count：11 Percentile：61.99(Nuclear Science & Technology)no abstracts in English
Hayashi, Takumi; Kobayashi, Kazuhiro; Nishi, Masataka
Genshiryoku eye, 47(5), p.73 - 76, 2001/05
no abstracts in English
Hayashi, Takumi; Okuno, Kenji; Ishida, Toshikatsu*; Yamada, Masayuki; Suzuki, Takumi
Fusion Engineering and Design, 39-40, p.901 - 907, 1998/00
Times Cited Count：24 Percentile：85.15(Nuclear Science & Technology)no abstracts in English
Hayashi, Takumi
Purazuma, Kaku Yugo Gakkai-Shi, 73(12), p.1341 - 1346, 1997/12
no abstracts in English
Ikeda, Yoshitaka; Ushigusa, Kenkichi; Seki, Masami; Suganuma, Kazuaki;
JAERI-Research 97-075, 15 Pages, 1997/10
JAERI-Research-97-075.pdf:0.89MB
no abstracts in English
Hayashi, Takumi; Yamada, Masayuki; Suzuki, Takumi; Matsuda, Yuji; Okuno, Kenji
Fusion Technology, 28(3), p.1503 - 1508, 1995/10
no abstracts in English
Hayashi, Takumi; Okuno, Kenji
Materials for Advanced Energy Systems & Fission and Fusion Engineering '94, p.205 - 207, 1994/06
no abstracts in English
; Shimizu, Toku; ; ; Naruse, Yuji
Nihon Genshiryoku Gakkai-Shi, 23(12), p.923 - 929, 1981/00
Times Cited Count：3 Percentile：45.64(Nuclear Science & Technology)no abstracts in English
; ; Naruse, Yuji
JAERI-M 8648, 29 Pages, 1980/01
no abstracts in English
; ; Naruse, Yuji
JAERI-M 8612, 30 Pages, 1979/12
no abstracts in English
Hayashi, Takumi; Nakamura, Hirofumi; Iwai, Yasunori; Kawamura, Yoshinori; Isobe, Kanetsugu; Yamada, Masayuki; Suzuki, Takumi; Kurata, Rie; Edao, Yuki; Perevezentsev, A.*
no journal, ,
no abstracts in English
Edao, Yuki; Iwai, Yasunori; Sato, Katsumi; Hayashi, Takumi
no journal, ,
no abstracts in English
Iwai, Yasunori; Kondo, Akiko*; Edao, Yuki; Sato, Katsumi; Kubo, Hitoshi*; Oshima, Yusuke*
no journal, ,
Effect of halogenated gas on detritiation efficiency of the detritiation system has been investigated taking an event of off normal event such as fire into consideration. Concerning the activity of platinum catalyst for oxidation of tritium, we have evaluated the steep decrease in activity of platinum catalyst in the presence of halogenated gas. In order to avoid the steep decrease in activity, a noble catalyst alloyed with platinum and palladium showed an outstanding proof. In addition, the halogenated acid produced over catalyst surface affects the activity of catalyst. As for water absorber, a molecular sieve decreased its water absorbing capacity in the presence of halogenated gas.
