[1F14-19] Fuel Debris 3

[1F18] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(13) Development of a model to simulate dispersion behavior of dust with non-spherical shapes.

*Kenta Inagaki¹, Tadafumi Koyama¹, Koichi Uozumi¹, Taizo Kanai¹, Kinya Nakamura¹, Shun Kanagawa¹, Tetsuya Kato¹, Yamauchi Daisuke ², Kazutaka Mogi², Yuichi Iwata² (1. CRIEPI, 2. TEPCO HD)

Keywords:dust, dispersion behavior, non-spherical model, simulation, particle methoc

In this study, we developed a non-spherical model for the simulation of dust dispersion behavior where non-spherical shape is expressed with a combination of spherical particles. By employing this approach, we calculated the terminal velocities of the non-spherical models with various shapes and densities in stagnant air, enabling the determination of their aerodynamic diameters. Furthermore, we conducted analysis of the tests performed in this project using this method, comparing the measured results with the analytical results to validate the proposed approach. The analysis of the results provided insights into the detailed dispersion behavior and contributed to reduction of the uncertainty in dispersion rate assessment based on feedback from the obtained knowledge derived from the analysis.