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Kamiji, Yu; Terada, Atsuhiko; Hino, Ryutaro
Nihon Kikai Gakkai Kanto Shibu Ibaraki Koenkai 2012 Koen Rombunshu, p.63 - 64, 2012/08
Low-speed up-flow is generated due to the water radiolysis in the spent vessel used by contaminated water treatment facility of Fukushima Dai-ichi Nuclear Power Plant. Though it is important to understand the inside flow of the vessel for storage, it is not clear. Thus flow test was performed with a simulated acrylic cylindrical vessel. This paper reports results of visualization of low-speed upflow in a cylindrical vessel by using LASER light sheet and high speed camera. It was confirmed that stagnant flow was generated around the stepped section, and the stagnant flow repeated appearance and dissipation. It was also found that the behavior of the stagnation depended on gas flow rate.
short elbow in JSFRTanaka, Masaaki; Fujisaki, Tatsuya*
no journal, ,
Numerical simulation method to analyze unsteady flow phenomena in the upper plenum and the hot-leg piping system in Japan Sodium cooled Fast Reactor (JSFR) has been developed. A flow-induced vibration in the hot-leg piping is mainly targeted in this study. A numerical model of the hot-leg piping integrated into a symmetric half domain of the upper plenum was constructed. Through the numerical simulations, applicable numerical schemes and turbulence model (RSM) were confirmed and requirements of mesh arrangement for the transient calculation were revealed.
Yoshikawa, Ryuji; Imai, Yasutomo*
no journal, ,
In Japan Atomic Energy Agency (JAEA), a study of the thermodynamic feasibility of straight-tube steam generator for Fast Breeder Reactor has been conducted. A multi-channel computer code to analyze thermodynamics and flow stability in water-side of steam generator was developed with drift-flux model. The computer code was validated by the simulation of flow instabilities in two parallel channels and comparison with experimental results. The capability of flow simulation in multi channels was confirmed by the simulation of flow instability in 401 parallel channels. Parallelization for the multi-channel analysis code with MPI was performed in order to increase the computing efficiency, and the parallelization efficiency was confirmed.