压水堆燃料组件轴向格架的中子学影响研究

The heterogeneous modeling method and homogenous modeling method have been respectively proposed for the axial grids based on the advanced fuel-management code for PWR named Bamboo-C. Based on these two different modeling methods for axial grids, modeling analysis for the fuel assemblies of M310 reactor in Fuqing Nuclear Power Plant is carried out. By comparing with the measured data of the reactor core, the effects of two different modeling methods on the critical boron concentration, axial power distribution and axial power offset are tested. The numerical results show that the axial heterogeneous modeling method of PWR fuel assembly can significantly improve the calculation accuracy of the key physical parameters of the reactor core.