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Nishizaki, Masanori*; Tsuruoka, Hokuto*; Sugiyama, Kenichiro*; Narabayashi, Tadashi*; Ohshima, Hiroyuki
Proceedings of 17th International Conference on Nuclear Engineering (ICONE-17) (CD-ROM), 6 Pages, 2009/07
The secondary tube failure may occur due to overheating by sodium-water reaction in LMFBR steam generator. It is very important to understand the void fraction distribution in sodium pool to evaluate the overheating tube rupture. In the present study, the Ar jet of 17.3 m/s to 129.8 m/s was injected from nozzle of 3.5 mm diameter in sodium pool with 443 K and 293 K. The authors measured the void fraction without chemical reaction along the jet-center axis. As the result, the void fraction increased when the distance from the nozzle decreased. The void fraction did not change when the distance from the nozzle was blow or equal to about 1.0 mm. The void fraction in sodium was lower the that in water, it is suggested that this trend reflects the fact the surface tension of sodium is higher than that of water.
Tsuruoka, Hokuto*; Tamura, Takeshi*; Sugiyama, Kenichiro*; Narabayashi, Tadashi*; Ohshima, Hiroyuki
Proceedings of 16th International Conference on Nuclear Engineering (ICONE-16) (CD-ROM), 6 Pages, 2008/05
The occurrence of secondary heat transfer tube failure due to overheating by sodium-water reaction in LMFBR steam generators has been concerned from the viewpoint of public acceptance. To evaluate the phenomena, a sophisticated computer code SERAPHIM has been developed by JAEA. For the purpose of obtaining fundamental data for the validation of the code, a sodium experiment was carried out, where the void fraction around a single rod set in a sodium pool without sodium-water reaction was measured. The void fraction was observed to somewhat increase with increasing the gas jet velocity. The increase rate was clearly smaller compared with that in the water experiment. The void fraction also showed more monotonous distribution from the stagnation point to the rear point than that in water pool. These results reflect the difference of surface tension between water and sodium. It is concluded that the entrainment of ambient sodium is easily caused and this leads monotonous distribution of void fraction in the sodium pool.
Tsuruoka, Hokuto*; Tamura, Takeshi*; Sugiyama, Kenichiro*; Narabayashi, Tadashi*; Ohshima, Hiroyuki
no journal, ,
A fundamental experiment, in which Ar gas blew into sodium pool and impinged against a single rod, was performed and the void fraction distribution in the pool was measured using developed void probes. It elucidated the mixing behavior of ambient sodium and gas jet without chemical reaction.