Study on Debris Bed Cooling Model for Sodium-Cooled Fast Reactor

概要

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This paper describes a debris-bed cooling model for a Sodium-Cooled Fast Reactor (SFR). The model aims at addressing not only the debris-bed consisted of the particles of the diameter with the hundreds of micrometers typically assumed with SFR but also the debris-bed with larger diameter particles. Then, it can cope with wider range of the scenario in the severe accident of SFR. Pressure losses of a laminar flow and a turbulent flow, gravity force and capillary force are considered in the basic equations. The present study model is validated through the analysis of the Sandia ACRR-D10 in-pile experiments utilizing real materials to simulate the SFR environment. Sensitivity analyses are performed by using the present study model to evaluate the influence of gravity force, turbulent flow pressure loss and the diameter of particles. It is shown from the sensitivity analysis, that gravity force influences the temperature and the liquid saturation in the debris-bed with larger diameter particles, while the turbulent flow pressure loss has small influence with the range of these sensitivity analyses.