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首页> 外文会议>International conference on the physics of reactors;PHYSOR 2010 >IMPROVING CROSS SECTIONS VIA SPECTRAL REHOMOGENIZATION
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IMPROVING CROSS SECTIONS VIA SPECTRAL REHOMOGENIZATION

机译：通过光谱再均化改善横截面

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摘要

Cross sections used in nodal calculations come from infinite medium flux homogenization. Their dependencies from physical working conditions are solved through interpolation on common multi-parameterized tables. If the difference between the neutron spectrum in the true environment and in the infinite medium is relevant, these averaged values do not permit to represent true reaction rates. For example, the error induced is not negligible with neighboring assemblies with different compositions. This is the case of UO_2 assemblies placed near M0X assemblies. The purpose of the method presented here is determining a homogenization correction to multi-group cross sections, corresponding to the difference between the environmental and infinite medium spectrum. An investigation of the feasibility of using the spectral rehomogenization as method to model the dependence of the cross sections on local conditions, such as the insertion of a control rod bank, is presented.
机译：节点计算中使用的横截面来自无限的介质通量均化。它们对物理工作条件的依赖性通过在常见的多参数表上进行插值来解决。如果真实环境和无限介质中的中子谱之间的差异是相关的，则这些平均值不允许代表真实的反应速率。例如，所引起的误差对于具有不同成分的相邻组件是不可忽略的。这是UO_2程序集放在M0X程序集附近的情况。这里介绍的方法的目的是确定对多组横截面的均质化校正，对应于环境和无限介质光谱之间的差异。提出了使用频谱均质化作为对横截面与局部条件（例如插入控制棒组）的依赖关系进行建模的方法的可行性的研究。

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