As the AFA 2G and AFA 3G are mixed loaded in the transition cycle, it will result that the minimum DNBR in the mixed core is less than that of AFA 3G homogenous core, the envelop mixed core DNBR penalty is given in this paper.

• 由于在过渡循环中AFA 2G和AFA 3G燃料组件混装,使混合堆芯的最小DNBR小于均匀堆芯的最小DNBR,本文确定了一个包络的混合堆芯DNBR亏损规律。