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Takenaga, Hidenobu; Asakura, Nobuyuki; Kubo, Hirotaka; Konoshima, Shigeru; Nakano, Tomohide; Porter, G.*; Rognlien, T.*; Rensink, M.*
Journal of Plasma and Fusion Research SERIES, Vol.7, p.35 - 39, 2006/00
no abstracts in English
Shirai, Hiroshi
Purazuma, Kaku Yugo Gakkai-Shi, 79(7), p.691 - 705, 2003/07
Methods for heat transport analysis and heat transport simulation in toroidal plasmas are summarized on the basis of energy balance equation. Joule heating, NBI heating, RF heating and heating are briefly explained. Among the energy loss mechanism, the conduction loss and the radiation loss dominate in the core plasma region and the peripheral region, respectively. In tokamaks, the anomalous transport caused by microturbulence is much larger than the neoclassical transport. The other mechanisms of enhanced transport, the sawtooth oscillation and the magnetic island formation, are also shown.
Muroi, Masayuki*
JNC TJ8400 2000-042, 142 Pages, 2000/02
Hyperalkaline pore water of cementitious material used in TRU waste repository would react with bentonite and cause the increased porosity and the loss of the swelling and sorption ability. This work is a modelling study on bentonite-cement pore water. The possible extent of reaction between bentonite and cement pore water was simulated using the PRECIP reaction-transport code. Three cement pore fluid compositions (leachates 1,2 and 3) were reacted with a 1-D, 1m flowpath of bentonite (+ sand) at 25 and 70C. Key minerals were allowed to dissolve and precipitate using kinetic reaction mechanism. Leachate 1 was the most aggressive fluid (highest pH, Na and K), and leachate 3 (1owest pH, Na and Ca) the least aggressive. Simulation with leachate 1 showed total removal of primary bentonite minerals up to 60 cm from the contact with cement after
1000 years. The maximum porosity increase observed was in leachate 1(up to 80-90%) over a narrow zone 1-2 cm. Simulations with all fluids showed total filling of pore with CSH minerals in a zone very close to the interface with the cement, whereas zeolites and sheet silicates formed far away. For a given leachate composition, there was little difference in the profiles at the two temperatures studied. It was suggested that bentonite alteration was not sensitive to the kinetic parameters over the conditions studied. The conceptual model chosen for the modelling study assumed that there was an unlimited amount of cement pore fluid available for reaction with bentonite so that the results of the simulations represent a conservative (pessimistic) estimate. There were a number of uncertainties associated with the modelling which relate to assumptions concerning: the kinetic mechanisms for dissolution and growth of minerals at elevated pH; evolving surface areas of minerals with time; thermodynamic data for CSH minerals, zeolites and aqueous species at high pH; the synergy between changing porosity and fluid ...
Takada, Hiroshi
Mathematics and Computation, Reactor Physics and Environmental Analysis in Nuclear Applications, 2, p.929 - 938, 1999/00
no abstracts in English
Sukegawa, Takenori; Hatakeyama, Mutsuo
Dekomisshoningu Giho, (8), p.66 - 77, 1993/06
no abstracts in English
Sukegawa, Takenori; Sasamoto, Nobuo; Fujiki, Kazuo
INDC(JPN)-164, 38 Pages, 1993/03
no abstracts in English
Shimizu, Katsuhiro; Hosogane, Nobuyuki; Shirai, Hiroshi; Hirayama, Toshio
Journal of the Physical Society of Japan, 61(2), p.560 - 567, 1992/02
Times Cited Count:0 Percentile:0.01(Physics, Multidisciplinary)no abstracts in English
; Research Committee on Reactor Physics
JAERI-M 91-015, 188 Pages, 1991/02
no abstracts in English
Shimizu, Katsuhiro; Hirayama, Toshio; Shirai, Hiroshi; Tani, Keiji; ; Azumi, Masafumi
JAERI-M 89-146, 53 Pages, 1989/10
no abstracts in English
; ; ; ; ; ;
Journal of Nuclear Science and Technology, 19(8), p.628 - 637, 1982/00
Times Cited Count:2 Percentile:32.83(Nuclear Science & Technology)no abstracts in English
; ;
Journal of the Physical Society of Japan, 50(2), p.647 - 654, 1981/00
Times Cited Count:1 Percentile:17.76(Physics, Multidisciplinary)no abstracts in English