Quasi one dimension modified computing method for multi-cycle fuel management calculation

A quasi one dimension modified computing method is proposed in this paper. Batch relative powers are modified according to the real batch positions in this method. To consider the influence of different boundary positions, the peripheral assembly can be divided into many batches. Compared with the traditional zero dimension point reactor model, the quasi one dimension modified computing method can more exactly describe the multi-cycle real core reload calculations. The verified calculations have been executed for Qin-Shan I (NPP) 1-6 cycle in this method. Compared with the calculated results given by the three dimension core code RSIM, the maximum cycle burnup difference is 2.89% and the maximum discharge burnup difference is 1.30%. The maximum discharge burnup difference is approximately one third of that of the zero dimension point reactor model.