An Analysis of CABRI E7 experiment for validation of detailed fuel pin model in the SIMMER-V code

Ishida, Shinya  ; Tagami, Hirotaka*; Yamano, Hidemasa   ; Kubo, Shigenobu 

An improved and detailed fuel pin model has been developed at JAEA as part of a new SIMMER-V code under a joint research program being conducted in the frame of the French-Japanese collaboration. The model allows a continuous analysis from the initiating phase to the transition phase in future sodium-cooled fast reactors (SFRs). In addition, the model can accommodate specific core geometries such as annular fuel pellets and axially heterogeneous cores. This paper describes the validation study of the new pin model based on the analysis of a CABRI test. CABRI E7 test analyses are conducted by SIMMER-V and SAS4A codes. The validation results show that the new pin model has a capability to express the physical phenomena related to mechanical fuel pin failure for severe accidents of SFRs. Through the new pin model validation work, the model improvement enables more realistic evaluation of the mechanical fuel pin failure and the reliability of the new pin model has been improved.