Development and Verification of Doppler Broadening Module in Nuclear Data Processing Code

In order to meet the numerical simulation of various operating conditions in nuclear reactors, it is necessary to provide cross-section data at different temperature. However, the cross sections provided in the evaluated nuclear data library are the data at 0 K. Therefore, in order to meet the needs of core physics numerical simulation calculations, it is necessary to perform Doppler broadening processing based on the evaluated nuclear data in the evaluated nuclear data library to obtain continuous energy pointwise cross sections at different temperatures. Through the Kernel Broadening accurate Doppler broadening calculation method, the theoretical derivation and code development of the Doppler broadening calculation method have been completed. Based on the CENDL-3.2 evaluated nuclear data library, the broadening cross sections at different temperatures are calculated based on the doppler_broad module developed in this paper and the BROADR module in the NJOY2016, respectively, and a computational analysis is performed to verify the rationality of some convergence parameters in the Doppler broadening calculation process. The numerical results indicate that for the four temperature points of 293.6 K, 600 K, 900 K and 10⁸ K, the calculation results in this paper are in good agreement with the NJOY2016 calculation results. The value of the NMAX parameter, which determines the limit of adjacent broadening energy points, has a significant impact on the broadening cross sections. The maximum relative deviation of the broadening cross sections for different values is 1.091%.