Presentation Information
[2C01]Experimental Study on 3D Large-Scale Debris Bed Formation Behavior in Sodium-Cooled Fast Reactors(1) Underwater experiments using monodisperse particles
*Tomonari Mashiko1, Yihua Xu1, Yohei Kano1, Ryo Yokoyama1, Shuichiro Miwa1, Koji Okamoto1 (1. UTokyo)
Keywords:
Sodium-cooled fast reactor,Debris bed formation,Core disruptive accident,Monodisperse,Experimental study
In a core disruptive accident of a sodium-cooled fast reactor, molten fuel is rapidly cooled by liquid sodium with high thermal conductivity and is fragmented into fine debris particles. This study aims to clarify the sedimentation and deposition behavior of such fine particles during debris-bed formation through granular deposition experiments in water. Monodisperse particles were prepared as test materials, and the particle diameter, particle density, and nozzle diameter for particle release were systematically varied. The deposition behavior and resulting debris-bed geometry were measured. As a result, the key factors governing the debris-bed shape were identified, and empirical correlations were developed.