Fuel behavior analysis code FEMAXI-ATF development for SiC cladding analysis for LWRs

Yamashita, Shinichiro; Shirasu, Noriko; Saito, Hiroaki

no journal, , 

The FEMAXI-ATF code has been developed to analyze the SiC-cladding-fuel behaviors as an extended version of the LWR fuel-analysis code FEMAXI-7. The analysis using the FEMAXI-ATF code indicated that the SiC cladding shows large swelling by irradiation and it causes the decrease of cladding thermal conductivity and the gap conductance, and consequently increase of the fuel temperature. Furthermore, the mechanical integrity for SiC cladding and influence of pellet-cladding mechanical interaction (PCMI) were evaluated.