부산대학교 도서관

Dual-cooled annular fuel allows a significant increase in power density while maintaining or improvingsafety margins. However, the dual-cooled design brings much higher Zircaloy charge in reactor core,which could cause a great threaten of hydrogen explosion during severe accidents. Hence, an innovativefuel combined dual-cooled annular geometry and SiC cladding was proposed for the first time in thisstudy. Capabilities of fuel design and behavior simulation were developed for this new fuel by the upgradeof FROBA-ANNULAR code. Considering characteristics of both SiC cladding and dual-cooled annulargeometry, the basic fuel design was proposed and preliminary proved to be feasible. After that, a designoptimization study was conducted, and the optimal values of as-fabricated plenum pressure and gas gapsizes were obtained. Finally, the performance simulation of the new fuel was carried out with the fullconsideration of realistic operation conditions. Results indicate that in addition to possessing advantagesof both dual-cooled annular fuel and accident tolerant cladding at the same time, this innovative fuelcould overcome the brittle failure issue of SiC induced by pellet-cladding interaction