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Journal Articles

Applicability of mechanistic analysis code seraphim to sodium-water reaction in tube bundle system

Kosaka, Wataru; Uchibori, Akihiro; Watanabe, Akira*; Shiina, Yoshimi*

Proceedings of 10th Workshop on Computational Fluid Dynamics for Nuclear Reactor Safety (CFD4NRS-10) (Internet), 12 Pages, 2025/00

Journal Articles

High-temperature gaseous reaction of cesium with siliceous thermal insulation; The Potential implication to the provenance of enigmatic Fukushima cesium-bearing material

Rizaal, M.; Nakajima, Kunihisa; Saito, Takumi*; Osaka, Masahiko; Okamoto, Koji*

ACS Omega (Internet), 7(33), p.29326 - 29336, 2022/08

https://doi.org/10.1021/acsomega.2c03525

Times Cited Count：7 Percentile：32.94(Chemistry, Multidisciplinary)

Journal Articles

IS process hydrogen production test for components and system made of industrial structural material, 1; Bunsen and HI concentration section

Tanaka, Nobuyuki; Takegami, Hiroaki; Noguchi, Hiroki; Kamiji, Yu; Iwatsuki, Jin; Aita, Hideki; Kasahara, Seiji; Kubo, Shinji

Proceedings of 8th International Topical Meeting on High Temperature Reactor Technology (HTR 2016) (CD-ROM), p.1022 - 1028, 2016/11

Japan Atomic Energy Agency (JAEA) has manufactured 100 NL/h-H-scale hydrogen test apparatus. In advance to conduct the continuous operation, we investigated performance of the components in each section of the IS process. In this paper, the results of test of Bunsen and HI concentration sections was shown. In Bunsen reaction, section, we confirmed that outlet gas flow rate included no SO $_{2}$ gas, indicating that all the feed SO $_{2}$ gas was absorbed to the solution in the Bunsen reactor for the Bunsen reaction. On the basis of these results, we evaluated that Bunsen reactor was workable. In HI concentration section, HI concentration was conducted by EED stack. As a result, it can concentrate HI in HIx solution as theoretically predicted on the basis of the previous paper. Based on the results added to that shown in Series II, we have conducted a trial continuous operation and succeeded it for 8 hours.

Journal Articles

Synthesis of Al $_{x}$ Ga $_{1-x}$ N alloy by solid-phase reaction under high pressure

Saito, Hiroyuki; Utsumi, Wataru; Kaneko, Hiroshi*; Aoki, Katsutoshi

Japanese Journal of Applied Physics, Part 2, 43(7B), p.L981 - L983, 2004/07

https://doi.org/10.1143/JJAP.43.L981

Times Cited Count：5 Percentile：23.18(Physics, Applied)

Bulk specimens of Al $_{x}$ Ga $_{1-x}$ N alloys covering a composition range of 01 were synthesized by a solid-phase reaction under high pressure. X-ray diffraction profiles were measured to observe the alloying process, which began at around 800 $^{circ}$ C under 6.0 GPa. SEM observation and X-ray analysis of the recovered specimen indicated a uniform distribution of Al and Ga and continuous variations of the lattice constants against the composition, which implies that a solid solution of AlN and GaN is formed regardless of atomic composition.

JAEA Reports

The Reaction of hydrazine nitrate with nitric acid

Kida, Takashi; Sugikawa, Susumu

JAERI-Tech 2004-019, 30 Pages, 2004/03

JAERI-Tech-2004-019.pdf:1.23MB

It is known that hydrazine nitrate used in nuclear fuel reprocessing plants is an unstable substance thermochemically like hydroxylamine nitrate. In order to take the basic data regarding the reaction of hydrazine nitrate with nitric acid, initiation temperatures and heats of this reaction, effect of impurity on initiation temperature and self-accelerating reaction when it holds at constant temperature for a long time were measured by the pressure vessel type reaction calorimeter etc. In this paper, the experimental data and evaluation of the safe handling of hydrazine nitrate in nuclear fuel reprocessing plants are described.

JAEA Reports