NECP-Atlas中屏蔽数据库制作方法

To acquire a more accurate shielding library and improve the accuracy of key parameters in shielding calculations, the energy-group structure optimization is performed based on the contributon theory to improve thermal neutron flux and photon flux in shielding calculations using the shielding library generation module in the nuclear data processing code NECP-Atlas. The shielding library with optimized energy-group structure is verified using the SINBAD shielding benchmarks. The numerical results show that the thermal neutron flux and photon flux calculated using the optimized energy-group structure are significantly improved compared with those calculated using the original energy-group structure of the BUGLE-B7 shielding library. The bias of the thermal neutron flux is reduced from 100% to approximately 30% and that of the photon flux is reduced from 50% to approximately 10%, which enhances the accuracy of the thermal neutron flux and photon flux calculation results in the shielding calculations.