Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : July 26, 2021 - July 27, 2021
In the severe accident evaluation of sodium-cooled fast reactors (SFRs), a module to analyze core disruptive accidents (CDAs) from the initiating phase to the transition phase of various cores has been developed for the purpose of consistent evaluation of the entire accident process from the initial to the final state. In this paper, the physical phenomena in steady-state irradiation and CDA events of mixed oxide (MOX) fuel and metallic fuel of sodium-cooled fast reactors are summarized and the functions to be included in the analysis module are discussed. For both fuel compositions, the deformation of the core material due to the accumulated FP gas in the fuel caused by neutron irradiation and the post-failure migration were the main important issues. Eutectic and extrusion are also important issues as features of metallic fuels.
