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Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*
Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00
no abstracts in English
Kawano, Yasunori; JT-60 Team
Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00
Diagnostics play essential roles both in understanding of the plasma physics and in control of the plasma itself. JT-60U has plenty of developments and thus experiences in concepts of the real-time feedback control. The parameters concerned are averaged electron density, neutron emission rate, plasma stored energy, central electron temperature, temperature gradient, temperature fluctuations, current density profile, plasma radiation, outer gap distance, neutral gas pressure, etc., and those combinations. In JT-60U, production of high-performance fusion plasmas and their sustainment owed to such the real-time feedback control. In this paper, the overview of diagnostics equipped for the real-time feedback control in JT-60U is presented.
Saito, Masahiro*; Okada, Noriko*; Nishibori, Eiji*; Takagiwa, Hiroyuki*; Yokoo, Tetsuya*; Nishi, Masakazu*; Kakurai, Kazuhisa; Kunii, Satoru*; Takata, Masaki*; Sakata, Makoto*; et al.
Journal of the Physical Society of Japan, 71(10), p.2369 - 2372, 2002/10
Times Cited Count：14 Percentile：60.62(Physics, Multidisciplinary)no abstracts in English
Ozu, Akira
Optics & Laser Technology, 32(5), p.379 - 383, 2000/07
no abstracts in English
Kakehi, Isao;
JNC TN9400 2000-054, 84 Pages, 2000/04
JNC-TN9400-2000-054.pdf:7.15MB
This report describes accomplishment of the study on the quality of vipac (vibro-packed) oxide fuel obtained by pyrochemical processing (molten salt electrolytic processing). This study is intended to contribute to the design study of the pyro-reprocessing-vipac fuel recycling system of oxide fuel. In this study, vibro-packing experiment has been conducted using granular U0
obtained by molten salt electrolytic processing (cold experiment). The oxide pyro process developed by Research lnstitute of Atomic Reactors (RIAR) is the method in which the sintered oxide is electrically deposited on the cathode at approximately 600
C. 0xide granules for vipac fuel are obtained by crushing the oxide deposited on the cathode. This process is also developed as recycle process because it is capable of FP separation. Also in Japan, this process is studied as one of the new FBR fuel recycling systems. ln this study, we made an effort to clarify the mechanisms of vibro-packing of the electrically obtained granules, which influence on the effective parameters of vibro-packing density and fuel particles size distribution in the fuel cladding in case of non-sphere particles of the granules. As a result of the study, smear density of 75% and almost uniform distribution of U0 particles have been taken in the experiment, and much knowledge for the improvement of the vibro-packing quality has been found. And the possibility of the smear density over 80% and the uniform distribution of U0 particles has been suggested in this study.
Aoyagi, Takayoshi*; Mihara, Morihiro; Tanaka, M.*; Okutsu, Kazuo*
JNC TN8400 99-058, 55 Pages, 1999/11
For the emplaced waste in TRU waste disposal facility, it may have the void for waste bodies it. And, generating void which accompanies those component elution in concrete pit and filler in which the cement material becomes the candidate material is assumed. It is considered that the security of the diffusion control in the bentonite is not done when these voids collapsed, and when it generated the volume change inside the buffer material (bentonite). The imperfect blockage of the void by not obtaining, the sufficient swelling pameability swelling bentonite is a cause on this. Then, volume change of the bentonite inside is analyzed in this study under the conservative estimation. And the following are tested: Self-sealing, maximum swelling rate, density distribution change of the batonite. Evaluation of the engineered barrier system for volume change from the result was carried out. Prior to the evaluation, generating void was calculated based on the conservative estimation. The density of the buffer material as it assumed the blocking by buffer material uniformly awelling using this calculated data, was obtained. By the permeability got from existing research result which shows the relationship between density and permeability of the bentonite, it was confirmed to become diffusion control in the buffer material inside, in existing engineered barrier specification. Next, it was tested, when the conservative void of the superscription was assumed, in order to confirm whether it does the security, as permeability necessaly for maintaining diffusion control, puts it for the swelling of actual bentonite. As the result, it was possible to confirm sufficient swelling performance in order to do the security of the diffusion control in Na-bentonite. However, the swelling performance greatly lowered by comparing Na-bentonite in Ca-bentonite with under 1/6. The increase of the permeability not do the security of the diffusion control, when it was based on void quantity ...
Sugino, Hiroyuki; *
JNC TN8400 99-040, 75 Pages, 1999/11
The buffer material that will be buried as a component of the engineered barriers system swells when saturation by groundwater. As a result of this swelling, buffer material may penetrate into the peripheral rock zone surrounding the buffer through open fractures. If sustained for extremely in long-period of time, The buffer material extrusion could lead to reduction of buffer density, which may in turn degrade the assumed performance assessment properties (e.g., permeability, diffusion coefficient) JNC has been conducted the study of bentonite extrusion into fractures of rock mass as a part of high level waste research. In 1997, JNC has reported the test results concerning buffer material extrusion and buffer material erosion. These tests have been done using test facilities in Geological Isolation Basic Research Facility. After 1997, JNC also conducted analytical study of buffer material extrusion. This report describes the analysis results of this study which are reflected to the H12 report. In this analysis, The diffusion coefficient was derived as a function of the swelling pressure and the viscosity resistance of the buffer materials. Thus, the reduction in density of buffer materials after emplacement in saturated rock was assessed. The assessment was made assuming parallel-plate radial fractures initially filled by water only. Because fractures in natural rock masses inevitably have mineral inclusions inside of them and fractures orientation leads to fractures intersecting other fractures, this analysis gives significantly conservative conditions with respect to long-term extrusion of buffer and possible decrease in buffer density.
Yamauchi, Toshihiko; Hoshino, Katsumichi; Kawashima, Hisato; Ogawa, Toshihide; Kawakami, Tomohide; ; *
Japanese Journal of Applied Physics, Part 1, 37(10), p.5735 - 5741, 1998/10
Times Cited Count：3 Percentile：18.91(Physics, Applied)no abstracts in English
Takenaga, Hidenobu; Nagashima, Keisuke; Sakasai, Akira; Oikawa, Toshihiro; Fujita, Takaaki
Plasma Physics and Controlled Fusion, 40(2), p.183 - 190, 1998/00
Times Cited Count：41 Percentile：77.36(Physics, Fluids & Plasmas)no abstracts in English
Fukuda, Mitsuhiro; Okumura, Susumu; Arakawa, Kazuo
Nuclear Instruments and Methods in Physics Research A, 396(1-2), p.45 - 49, 1997/00
Times Cited Count：8 Percentile：56.73(Instruments & Instrumentation)no abstracts in English
Okamoto, Koji*; *; Fumizawa, Motoo
Proc. of 1997 ASME Fluids Engineering Division Summer Meeting (FEDSM'97), 0, p.1 - 6, 1997/00
no abstracts in English
*; Okamoto, Koji*; *; *; Fumizawa, Motoo
Kashika Joho Gakkai-Shi, 16(Suppl.1), p.15 - 18, 1996/07
no abstracts in English
Sakasai, Akira; Kubo, Hirotaka; Hosogane, Nobuyuki; Shimada, Michiya
3rd Int. Workshop on Helium Transport and Exhaust, 0, 28 Pages, 1996/00
no abstracts in English
Okamoto, Koji*; *; J.Feng*; Fumizawa, Motoo
Kashika Joho Gakkai-Shi, 15(SUPPL.1), p.173 - 176, 1995/07
no abstracts in English
J.Feng*; Okamoto, Koji*; *; *; Fumizawa, Motoo
Experimental and Numerical Flow Visualization 1995 (FED-Vol. 218), 0, p.157 - 162, 1995/00
no abstracts in English
Sakasai, Akira; Kubo, Hirotaka; Hosogane, Nobuyuki; Sugie, Tatsuo; Higashijima, Satoru; Itami, Kiyoshi; Asakura, Nobuyuki; Koide, Yoshihiko; Shimizu, Katsuhiro; Sakurai, Shinji; et al.
IAEA-CN-60/A2/A4-P12, 0, p.95 - 103, 1995/00
no abstracts in English
*; Okamoto, Koji*; *; Fumizawa, Motoo
Kashika Joho Gakkai-Shi, 14(SUPPL.1), p.39 - 42, 1994/07
no abstracts in English
Okamoto, Koji*; Fumizawa, Motoo
JSME International Journal, Series B, 37(3), p.503 - 508, 1994/00
no abstracts in English
*; Okamoto, Koji*; *; Fumizawa, Motoo
The 4th Triennial Int. Symp. on Fluid Control,Fluid Measurement,and Visualization; FLUCOME 94, 0, p.971 - 976, 1994/00
no abstracts in English
Okamoto, Koji*; Fumizawa, Motoo
Nihon Kikai Gakkai Rombunshu, B, 58(552), p.2479 - 2484, 1992/08
no abstracts in English
