Benchmark calculations of sodium-void experiments with uranium fuels at the fast critical assembly FCA

Fukushima, Masahiro; Kitamura, Yasunori; Kugo, Teruhiko; Yamane, Tsuyoshi; Ando, Masaki; Chiba, Go; Ishikawa, Makoto; Okajima, Shigeaki

Progress in Nuclear Science and Technology (Internet), 2, p.306 - 311, 2011/10

https://doi.org/10.15669/pnst.2.306

Benchmark calculations of sodium-void experiments with uranium fuels at the fast critical assembly FCA

Fukushima, Masahiro; Kitamura, Yasunori; Kugo, Teruhiko; Yamane, Tsuyoshi; Ando, Masaki; Chiba, Go; Ishikawa, Makoto; Okajima, Shigeaki

Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive), 6 Pages, 2010/10

Compact DEMO, SlimCS; Design progress and issues

Tobita, Kenji; Nishio, Satoshi; Enoeda, Mikio; Kawashima, Hisato; Kurita, Genichi; Tanigawa, Hiroyasu; Nakamura, Hirofumi; Honda, Mitsuru; Saito, Ai*; Sato, Satoshi; et al.

Nuclear Fusion, 49(7), p.075029_1 - 075029_10, 2009/07

https://doi.org/10.1088/0029-5515/49/7/075029

Recent design study on SlimCS focused mainly on the torus configuration including blanket, divertor, materials and maintenance scheme. For vertical stability of elongated plasma and high beta access, a sector-wide conducting shell is arranged in between replaceable and permanent blanket. The reactor adopts pressurized-water-cooled solid breeding blanket. Compared with the previous advanced concept with supercritical water, the design options satisfying tritium self-sufficiency are relatively scarce. Considered divertor technology and materials, an allowable heat load to the divertor plate should be 8 MW/m or lower, which can be a critical constraint for determining a handling power of DEMO (a combination of alpha heating power and external input power for current drive).

Descriptions of meso- and microscopic structures of fault zone rocks obtained from tunnel penetrated across the Mozumi-Sukenobe fault, central Japan

Tanaka, Hidemi*; Ito, Tanio*; Nohara, Tsuyoshi; Ando, Masataka*

Geodynamics of Atotsugawa Fault System, p.103 - 121, 2007/00

The Mozumi-Sukenobe fault, running ENE-WSW and dipping almost vertically, is one of the Atotsugawa right-lateral active faults in central Japan. A 500 m long horizontal tunnel was excavated across the Mozumi-Sukenobe fault, utilizing the pre-existing tunnel of the Kamioka Mine for geological and geophysical integrated research of the fault zones. In order to clarify the fault zone architecture and rock distribution, we have investigated the distribution across the tunnel and obtained samples directly from the tunnel. The following results were obtained by meso-and microscopic observations and mineralogical examination of fault rocks; (1) Two fracture zones (referred to as zones A and B) are distinguished. They are 15 and 50 m in thickness, respectively, composed of foliated fault breccia in a damaged zone and foliated fault gouge in the fault cores. The core-zones contain an 8 cm slip layer for zone A and several thin (10 cm) slip layers for zone B. (2) Most of the fault rocks obtained from the fault cores of the two fracture zones show a distinct foliated texture, which is clearly a product of cataclastic flow deformation. Very thin, ultra-fine grained slip layers, generated by seismic rapid slip, are also detected from fault core of zones A and B. The cross-cutting relationship between foliated and rapid slip textures indicate a repeated process of slow and rapid slips in zones A and B. (3) The results of mineral assemblage analysis show that these fault rocks are dominated by smectite clay minerals as well as by mica minerals and chlorite, all of which could be potential candidates for the main reason of the stable slip. Combining all these data, we conclude that the Mozumi-Sukenobe fault is activated by extremely slow frictional-viscous creep which releases crustal strain energy. However, stress would also be released by earthquakes based on the existence of earthquake slip surfaces in the fault cores of the Mozumi-Sukenobe fault.

Opacity effect on extreme ultraviolet radiation from laser-produced tin plasmas

Fujioka, Shinsuke*; Nishimura, Hiroaki*; Nishihara, Katsunobu*; Sasaki, Akira; Sunahara, Atsushi*; Okuno, Tomoharu*; Ueda, Nobuyoshi*; Ando, Tsuyoshi*; Tao, Y.*; Shimada, Yoshinori*; et al.

Physical Review Letters, 95(23), p.235004_1 - 235004_4, 2005/12

https://doi.org/10.1103/PhysRevLett.95.235004

no abstracts in English

Measurement of infinite multiplication factor in the mock-up core for reduced-moderation water reactor at FCA

Kojima, Kensuke; Okajima, Shigeaki; Yamane, Tsuyoshi; Ando, Masaki; Kataoka, Masaharu*; Iwanaga, Kohei

JAERI-Tech 2004-016, 38 Pages, 2004/03

JAERI-Tech-2004-016.pdf:1.46MB

To investigate the void coefficient in the Reduced-Moderation Water Reactor (RMWR), an infinite multiplication factor was measured in the FCA-XXII-1 (65V) core. Axial and radial fission rate distributions were measured by micro fission chambers with four different kinds of nuclides. The infinite multiplication factor was derived from the material buckling, which was obtained from both the axial and radial fission rate distributions, and the migration area calculated. The value of it in the test region of the FCA-XXII-1 (65V) core was 1.3440.034. It was compared with the calculation, the ratio of the calculation to the measurement was 1.0080.026. The improvement in measurement accuracy was also considered.

H-mode experiments with outer and lower divertors in JT-60

Nakamura, Hiroo; Tsuji, Shunji; ; Ozeki, Takahisa; Ishida, Shinichi; Azumi, Masafumi; Akiba, Masato; Ando, Toshiro; Fujii, Tsuneyuki; Fukuda, Takeshi; et al.

Nuclear Fusion, 30(2), p.235 - 250, 1990/02

https://doi.org/10.1088/0029-5515/30/2/004

no abstracts in English

Second harmonic ICRF heating experiments in JT-60

Fujii, Tsuneyuki; Kimura, Haruyuki; Saigusa, Mikio; Akiba, Masato; Ando, Toshiro; ; Aoyagi, Tetsuo; ; Azumi, Masafumi; Fukuda, Takeshi; et al.

Plasma Physics and Controlled Nuclear Fusion Research 1988, Vol.1, p.605 - 610, 1989/00

no abstracts in English

Development of reactivity feedback effect measurement techniques under sub-critical condition in fast reactor, 1-1; Purpose and program

Okajima, Shigeaki; Nishi, Hiroshi; Yamane, Yoshihiro*; Kanemoto, Shigeru*; Yamane, Tsuyoshi; Mori, Takamasa; Kitamura, Yasunori; Fukushima, Masahiro; Kitano, Akihiro; Ando, Masaki; et al.

no journal, , 

The program was planned and has been carried out to develop of the reactivity feedback effect measurement techniques under sub-critical condition in the start-up experiment for fast reactors. The program includes the demonstration of the developed technique in fast critical assembly (FCA) and the proposal of the appropriate measurement system based on the results. The background and the purposes of the program and the outline of development subjects are presented.

FCA critical experiment for validation of U capture cross section and experimental analysis

Kugo, Teruhiko; Kitamura, Yasunori; Fukushima, Masahiro; Ando, Masaki; Yamane, Tsuyoshi; Okajima, Shigeaki

no journal, , 

Sodium void reactivity experiments were performed at FCA using uranium fueled core to obtain integral data for evaluation of epithermal capture cross section of U. Experimental analysis were carried out with use of various nuclear data libraries including JENDL-4.0. The ratio of calculated value to experiment value (C/E) are less than unity with JENDL-3.3, ENDF/B-VII.0 and JEFF-3.1. This tendency of C/E values is similar to those for the sodium void reactivity experiments at BFS. Newly obtained integral data at FCA has a large sensitivity to U capture cross section from several hundreds eV to several keV. Thus, the new integral data are useful for validation of epithermal capture cross section of U and are used for the re-evaluation capture cross section of U in subgroup-29 of OECD/NEWA/NSC/WPEC.