Development of multi-level, multi-scenario simulation systems for sodium cooled fast reactor, 15; Development of multi-level simulation system

Doda, Norihiro  ; Yokoyama, Kenji   ; Tanaka, Masaaki  ; Takata, Takashi  ; Ohshima, Hiroyuki

A multi-level plant simulation system has developed to enhance a safety assessment technology for sodium cooled fast reactor (SFR). The system, in which high-efficient analyses with a one-dimensional plant dynamics analysis code and high-accurate local phenomena analyses with multi-dimensional codes are coupled, may apply to the various design options of SFR. For a validation of the system, the analysis on the experimental fast reactor EBR-II with the SHRT-45R test condition and a virtual condition of control rod withdrawn condition were performed. From the comparison of the analysis results and the test results, it was confirmed that the system could perform the evaluation by changing the level of detail of the analysis model according to the intended use.