JOPSS - Search Results

Journal Articles

Entrainment of water around a single rod immersed in water pool with gas jet impingement, 2

Tamura, Takeshi*; Soga, Kazuo*; Sugiyama, Kenichiro*; Narabayashi, Tadashi*; Ohshima, Hiroyuki; Suda, Kazunori

Proceedings of 15th International Conference on Nuclear Engineering (ICONE-15) (CD-ROM), 6 Pages, 2007/04

To evaluate the phenomena for the secondary heat transfer tube failure due to overheating by sodium-water reaction in steam generator of liquid sodium cooled fast breeder reactor, a sophisticated computer code SERAPHIM has been developed by JAEA. As the first step to verify the adequacy of SERAPHIM code, a visualization experiment of Ar gas jet impinging a single rod with 20mm in diameter immersed in a water pool was performed in our previous study. In this paper, we measured the void fraction around a single rod in the water pool as a basic experiment using the apparatus capable of doing sodium pool experiment to investigate the flow pattern and the water entrainment around a single rod. The result of the void fraction reflected the result of the heat transfer experiment that had been reported before was obtained, and a certain prospect of the measurement of the void fraction in sodium pool was obtained.

Journal Articles

Low-energy proton irradiation effects on GaAs/Si solar cell

Chandrasekaran, N.*; Soga, Tetsuo*; Inuzuka, Yosuke*; Taguchi, Hironori*; Imaizumi, Mitsuru*; Oshima, Takeshi; Jimbo, Takashi*

Japanese Journal of Applied Physics, 43(10A), p.L1302 - L1304, 2004/10

https://doi.org/10.1143/JJAP.43.L1302

Times Cited Count：6 Percentile：27.83(Physics, Applied)

no abstracts in English

Journal Articles

The Resonance Raman effect of uranyl formate in dimethyl sulfoxide

Soga, Takeshi

Spectrochimica Acta, Part A, 59(11), p.2497 - 2510, 2003/09

no abstracts in English

Journal Articles

The Resonance raman effect of UO $_{2}$ L $_{2}$ (L=NO $_{3}$ , CH $_{3}$ COO or Cl) type uranyl compounds in dimethyl sulfoxide

Soga, Takeshi

Journal of Nuclear Science and Technology, 39(Suppl.3), p.433 - 436, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875500

no abstracts in English

Journal Articles

The Resonance raman effect of dicaesium uranyl tetrachloride in dimethyl sulfoxide

Soga, Takeshi

Spectrochimica Acta, Part A, 57(9), p.1767 - 1780, 2001/08

no abstracts in English

Journal Articles

The Development of a Sodium Bonded Type Control Rod in Joyo

Soga, Tomonori; Tobita, Koichi; Mitsugi, Takeshi; Miyakawa, Shunichi

Saikuru Kiko Giho, (8), p.13 - 22, 2000/09

https://rdreview.jaea.go.jp/gihou/pdf2/9904.PDF

None

Journal Articles

The Resonance Raman effet of uranyl chloride in demethyl sulfoxide

Soga, Takeshi

Spectrochimica Acta, Part A, 56(1), p.79 - 89, 2000/01

no abstracts in English

JAEA Reports

The Improvement of control rod in experimental fast reactor JOYO; The development of a sodium bonded type control rod

Soga, Tomonori; Miyakawa, Shunichi; Mitsugi, Takeshi

JNC TN9400 99-052, 355 Pages, 1999/06

JNC-TN9400-99-052.pdf:13.11MB

Currently, the lifetime of control rods in JOYO is limited by Absorber-Cladding Mechanical Interaction (ACMI) due to swelling of B $_{4}$ C(boron carbide) pellets accelerated by relocation of pellet fragments. A sodium bonded type control rod was developed which improves the thermal conductivity by means of charging sodium into the gap between B $_{4}$ C and cladding and by utilizing a shroud which wraps the pellet fragments in a thin tube. This new design will be able to enlarge the gap between B $_{4}$ C and cladding, without heating B $_{4}$ C or fragment relocation, thus extending the life of the control rod. The sodium bonded type will be fabricated as the ninth reload control rods in JOYO. (1)The specification of a sodium bonded type control rod was determined with the wide gap between B $_{4}$ C and cladding. In the design simulation, main component temperature were below the maximum limit. And the local heating by helium bubble generated from B $_{4}$ C in the sodium gap, was not a serious problem in the analysis which was considered. (2)A structural design for the sodium entrance into the pin was determined. A formula was developed which the limit for sodium charging given physical dimension of the structure and sodium property. Result from sodium out-pile experiments validated the theoretical formula. (3)The analysis of ACMI indicated a lifetime extension of the sodium bonded type by 4.6% in comparison with lifetime of the helium bonded type of 1.6%. This is due to the boron10 burn-up rate being three times higher in the sodium bonded type than in the helium bonded type. To achieve a target burn-up 10% in the future, it will be necessary to modify design based on irradiation data which will be obtained by practical use of the sodium bonded control rods in JOYO. (4)The effects due to Absorber-Cladding Chemical Interaction (ACCI) were reduced by controlling the cladding temperature and chromium coating to the cladding's inner surface. It was confirmed that ...