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Evaluation of Neutron-induced Cross Sections and their Related Covariances with Physical Constraints
Nuclear Data Sheets ( IF 2.8 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.nds.2018.02.010
C. De Saint Jean , P. Archier , E. Privas , G. Noguère , B. Habert , P. Tamagno

Abstract Nuclear data, along with numerical methods and the associated calculation schemes, continue to play a key role in reactor design, reactor core operating parameters calculations, fuel cycle management and criticality safety calculations. Due to the intensive use of Monte-Carlo calculations reducing numerical biases, the final accuracy of neutronic calculations increasingly depends on the quality of nuclear data used. This paper gives a broad picture of all ingredients treated by nuclear data evaluators during their analyses. After giving an introduction to nuclear data evaluation, we present implications of using the Bayesian inference to obtain evaluated cross sections and related uncertainties. In particular, a focus is made on systematic uncertainties appearing in the analysis of differential measurements as well as advantages and drawbacks one may encounter by analyzing integral experiments. The evaluation work is in general done independently in the resonance and in the continuum energy ranges giving rise to inconsistencies in evaluated files. For future evaluations on the whole energy range, we call attention to two innovative methods used to analyze several nuclear reaction models and impose constraints. Finally, we discuss suggestions for possible improvements in the evaluation process to master the quantification of uncertainties. These are associated with experiments (microscopic and integral), nuclear reaction theories and the Bayesian inference.

中文翻译:

评估中子诱导截面及其与物理约束相关的协方差

摘要 核数据以及数值方法和相关的计算方案,继续在反应堆设计、反应堆堆芯运行参数计算、燃料循环管理和临界安全计算中发挥关键作用。由于蒙特卡罗计算的大量使用减少了数值偏差,中子计算的最终精度越来越依赖于所用核数据的质量。本文概括介绍了核数据评估人员在分析过程中处理的所有成分。在介绍了核数据评估之后,我们提出了使用贝叶斯推理获得评估横截面和相关不确定性的含义。特别是,重点关注微分测量分析中出现的系统不确定性以及分析积分实验可能遇到的优缺点。评估工作通常在共振和连续能量范围内独立完成,从而导致评估文件的不一致。对于未来对整个能量范围的评估,我们提请注意用于分析几种核反应模型并施加约束的两种创新方法。最后,我们讨论了在评估过程中可能改进的建议,以掌握不确定性的量化。这些与实验(微观和积分)、核反应理论和贝叶斯推理有关。评估工作通常在共振和连续能量范围内独立完成,从而导致评估文件的不一致。对于未来对整个能量范围的评估,我们提请注意用于分析几种核反应模型并施加约束的两种创新方法。最后,我们讨论了在评估过程中可能改进的建议,以掌握不确定性的量化。这些与实验(微观和积分)、核反应理论和贝叶斯推理有关。评估工作通常在共振和连续能量范围内独立完成,从而导致评估文件的不一致。对于未来对整个能量范围的评估,我们提请注意用于分析几种核反应模型并施加约束的两种创新方法。最后,我们讨论了在评估过程中可能改进的建议,以掌握不确定性的量化。这些与实验(微观和积分)、核反应理论和贝叶斯推理有关。最后,我们讨论了在评估过程中可能改进的建议,以掌握不确定性的量化。这些与实验(微观和积分)、核反应理论和贝叶斯推理有关。最后,我们讨论了在评估过程中可能改进的建议,以掌握不确定性的量化。这些与实验(微观和积分)、核反应理论和贝叶斯推理有关。
更新日期:2018-02-01
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