Development of multi-level simulation system for sodium-cooled fast reactor; Application of coupled 1D-CFD simulation to ULOF test of EBR-II

Yoshimura, Kazuo; Doda, Norihiro  ; Fujisaki, Tatsuya*; Murakami, Satoshi*; Tanaka, Masaaki  

The multi-level simulation system with 1D-CFD coupling method which enables to evaluate various phenomena from the whole plant dynamics to the local thermal hydraulics has been developed. The numerical simulation of the ULOF test in the experimental fast reactor EBR-II in the U.S. is performed for validation study of the 1D-CFD coupling method, which combines a one-dimensional plant dynamics analysis (1D) code with a computational fluid dynamics (CFD) code. Through the numerical simulation, it was shown that the whole plant response and the multi-dimensional thermal hydraulics in the core upper plenum could be simulated. And the applicability of the 1D-CFD coupling method to plant scale analysis was confirmed in comparison with the experimental results.