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Journal Articles

Flow pattern and pressure fluctuation characteristics on the 1/3 scale hot-leg piping experiments of a primary circuit hot-leg piping in a sodium-cooled fast reactor

Sago, Hiromi*; Shiraishi, Tadashi*; Watakabe, Hisato*; Xu, Y.*; Aizawa, Kosuke; Yamano, Hidemasa

Nihon Kikai Gakkai Rombunshu, B, 78(792), p.1378 - 1382, 2012/08

A conceptual design study of the Japan Sodium-cooled Fast Reactor (JSFR) is in progress in "the Fast Reactor Cycle Technology Development (FaCT) project", and a two-loop primary system is adopted in order to economize the plant construction cost. In the JSFR the pipe thickness is designed to be considerably thinner and the mean sodium velocity increases. To understand the behavior of flow-induced vibration that is derived from the hydraulic characteristics under high Reynolds number conditions experiments were performed to evaluate and confirm the integrity.

Journal Articles

Study on flow induced vibration evaluation for a large scale JSFR piping, 3; Pressure fluctuation characteristics in 1/3 scale hot-leg piping experiments under deflected inflow conditions due to UIS structures

Sago, Hiromi*; Shiraishi, Tadashi*; Watakabe, Hisato*; Xu, Y.*; Aizawa, Kosuke; Yamano, Hidemasa

Proceedings of 19th International Conference on Nuclear Engineering (ICONE-19) (CD-ROM), 8 Pages, 2011/10

Journal Articles

Pressure fluctuation characteristics of the short-radius elbow pipe for FBR in the postcritical Reynolds regime

Shiraishi, Tadashi*; Watakabe, Hisato*; Sago, Hiromi*; Yamano, Hidemasa

Journal of Fluid Science and Technology (Internet), 4(2), p.430 - 441, 2009/00

For the Japan Sodium-cooled Fast Reactor, an experimental study on the fluctuating pressure of the hot legs was carried out with tests using a 1/3-scale model. The total resistance coefficient is consistent with the published data, and our research has given some additional data up to the Reynolds number of 8.0$$times$$10$$^{6}$$. The flow pattern in the postcritical regime is independent of a Reynolds number. The statistical examination revealed that fluctuating pressures on the pipe wall depend on the mean velocity but not on the viscosity of the fluid. Negative spikes of pressure appeared for high velocity. Based on these experimental data it is concluded that, there are similarity laws for the scale of a model and the property of fluid, but not for the velocity in the pipe. Theoretical considerations also gave a discussion how to extrapolate the fluctuating pressure to the actual hot-leg conditions.

Journal Articles

Pressure fluctuation characteristics of the short-radius elbow pipe for FBR in the postcritical Reynolds regime

Shiraishi, Tadashi*; Watakabe, Hisato*; Sago, Hiromi*; Kotake, Shoji; Yamano, Hidemasa

Proceedings of 2nd International Conference on Jets, Wakes and Separated Flows (ICJWSF 2008) (CD-ROM), 11 Pages, 2008/09

For the JAEA sodium-cooled fast reactor, an experimental study on the fluctuating pressure of the hot legs was carried out with tests using a 1/3-scale model. The total resistance coefficient is consistent with the published data, and our research has given some additional data up to the Reynolds number of 8.0$$times$$10$$^6$$. The flow pattern in the postcritical regime is independent of a Reynolds number. The statistical examination revealed that fluctuating pressures on the pipe wall depend on the mean velocity but not on the viscosity of the fluid. Negative spikes of pressure appeared for high velocity. Based on these experimental data it is revealed that, there are similarity laws for the scale of a model and the property of fluid, but not for the velocity in the pipe. We also discussed how to extrapolate the fluctuating pressure to the actual hot-leg conditions.

Oral presentation

Study on flow-induced-vibration evaluation of large-diameter pipings in a sodium-cooled fast reactor, 2; Pressure fluctuation and flow pattern of the 1/3-scaled test of the hot leg in the postcritical Reynolds regime

Shiraishi, Tadashi*; Sago, Hiromi*; Watakabe, Hisato*; Yamano, Hidemasa; Kotake, Shoji

no journal, , 

This paper reports test results with room-temperature and hot (60 $$^{circ}$$C) water in order to investigate the effect of coolant viscosity on flow dynamics and pressure fluctuations of a hot-leg piping in the post critical Reynolds number regime.

Oral presentation

Study on flow-induced-vibration evaluation of large-diameter pipings in a sodium-cooled fast reactor, 17; Effect of inlet swirl flow on pressure fluctuation in 1/3-scale hot-leg experiment

Shiraishi, Tadashi*; Sago, Hiromi*; Watakabe, Hisato*; Xu, Y.*; Aizawa, Kosuke; Yamano, Hidemasa

no journal, , 

Flow characteristics in an elbow with swirl flow were experimentally obtained under a high Reynolds number regime. In the range of 0$$sim$$15% of swirl flow fraction, no significant effect of the swirl flow on the magnitude of pressure fluctuation was not seen although the flow separation region at the elbow was twisted by the swirl flow.

Oral presentation

Oral presentation

Evaluation for flow-induced vibration of a primary circuit hot-leg piping in a sodium-cooled fast reactor, 2; Flow pattern and pressure fluctuation characteristics on the 1/3 scale hot-leg piping experiments

Sago, Hiromi*; Shiraishi, Tadashi*; Watakabe, Hisato*; Xu, Y.*; Aizawa, Kosuke; Yamano, Hidemasa

no journal, , 

no abstracts in English

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