燃料组件内精细功率重构方法研究

为提高堆芯工程设计软件的计算精度,本文提出一种精细功率重构方法,即利用节块法求解所获得的横向积分中子通量分布作为逼近条件,采用权重系数法获得组件功率分布的两群17项多项式展开,并基于BW和IAEA2D基准题与13项和21项多项式展开法进行比较。数值计算结果表明,提出的17项多项式展开法相比传统的13项多项式展开法具有更高的计算精度,且计算精度接近21项多项式展开法。

Research on Pin Power Reconstruction of Fuel Assembly

In order to improve the precision of the core design calculation code , an advanced pin power reconstruction method was introduced in this paper .The new meth‐od used transverse integral flux distribution as the constrained function and obtained the 17 development coefficients by applying weight coefficient method . Comparisons between the new method and the traditional 13 and 21 development coefficients methods were carried out based on the B&W and IAEA2D benchmarks .The comparison results show that the new method gives better calculation accuracy than the traditional 13 devel‐opment coefficients method .Moreover ,the new method is more consistent to the 21 development coefficients method .