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截面加工软件(NJOY)程序求解无限均匀慢化方程时采用渐进散射核,忽略了共振弹性散射的影响,给特征值和多普勒系数的计算带来较大的误差。为在确定论程序中考虑这种效应,本文采用多普勒展宽舍弃修正(DBRC)方法修改了蒙特卡罗程序(MCNP)的自由气体模型,利用MCNP代替NJOY制作共振积分表。基于子群共振方法分析了轻水堆燃料棒的无限介质增殖因数和温度系数,并与MCNP的结果进行对比。数值结果表明,由于考虑了共振弹性散射效应,本文提出的修正方法提高了确定论方法的计算精度。
Asymmetric elastic scattering is neglected by NJOY program to solve infinite uniform moderation equation, which brings great error to the calculation of eigenvalue and Doppler coefficient. In order to consider this effect in the deterministic program, this paper modifies the free gas model of Monte Carlo (MCNP) using the Doppler Extend Discard Correction (DBRC) method and uses MCNP instead of NJOY to make the resonant integral table. Based on the sub-group resonance method, the infinite medium multiplication factor and temperature coefficient of light-water reactor rods were analyzed and compared with the MCNP results. The numerical results show that the proposed correction method improves the computational accuracy of the deterministic method due to consideration of the resonant elastic scattering effect.