Method for Resonance Elastic Scattering Correction in Deterministic Method
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摘要: 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。Abstract: The asymptotic scattering kernel is applied in NJOY to solve the slowing down equation, where the resonance elastic scattering is neglected. This assumption contributes considerable errors to eigenvalue and Doppler Coefficient（DC）. To take this effect into account in deterministic method, the Doppler Broadening Rejection Correction（DBRC） method is employed to correct the free gas model of MCNP, which is used to generate the resonance integral tables instead of NJOY. The infinite medium multiplication factor and DC of Light Water Reactor（LWR） are analyzed based on the subgroup method and the results are compared with those of MCNP. The numerical results show that the correction method proposed in this paper can be used to consider the resonance elastic scattering and promote the precision of the deterministic method.
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Key words:
- NJOY /
- MCNP /
- Resonance elastic scattering /
- Subgroup method
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