Investigation to select standard specification for demonstration FBR (Rotating Plug); Evaluation of analytical capability for sodium mist transport of thermal-hydraulic analysis code AQUA

Muramatsu, Toshiharu; not registered

The existed experimental data for natural convection in an annulus between a reactor vessel and a rotating plug were reviewed to understand its phenomena for a prevention measure of sodium mist deposition. The generalized keypoints are as follows; (1)Natural convection in overall circumference of the annulus is decreased by reducing the annulus gap width. (2)In evaluation of sodium mist into the annulus, the effect of sedimentation by gravity for its transport can be neglected, and (3)Sodium mist transport due to natural convection was dominated by axial and circumferential temperature distributions in the annulus. A calculation using the mass transport version of three-dimensional thermal-hydraulic analysis code, AQUA was carried out for the experiments of convection barrier. In the calculation results, sodium mist concentration at the top of annulus agrees well with the experiments.