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Nuclear data target accuracy requirements for advanced reactors: The ALFRED case
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2021-07-10 , DOI: 10.1016/j.anucene.2021.108533
Donato M. Castelluccio 1, 2 , Giacomo Grasso 1 , Francesco Lodi 1 , Vincenzo Giuseppe Peluso 1 , Alberto Mengoni 1
Affiliation  

Uncertainties estimation is essential for a sound assessment and a clear definition of safety margins, which in turn are crucial for licensing approval of new nuclear reactors by safety authorities. Moreover, uncertainties are also matter for target accuracy requirements (TARs), whose achievement could disclose new or enhanced opportunities. The concept of target accuracy requirements has been over the years one of the returning focuses of Massimo Salvatores, who just recently relaunched an update exercise within the OECD/NEA Working Party on International Nuclear Data Evaluation Co-operation (WPEC) aiming at providing new estimates having as reference the advanced systems meant for tomorrow.

This work presents an evaluation of the current accuracies on the main core integral parameters of the Advanced Lead-cooled Fast Reactor European Demonstrator (ALFRED), as a starting point to discuss which would be the target values that might introduce beneficial improvements in the design. Despite the use of one of the most recent nuclear data libraries (ENDF/B-VIII.0), and the broad margins set in the design of ALFRED according to its mission as demonstrator, room for improvement is found on the multiplication factor. Then, moving from the target accuracies on the integral parameters, an inverse uncertainty problem is solved to derive the corresponding target accuracies on nuclear data, meeting which would guarantee the achievement for the former ones. The inverse problem is solved introducing three different sets of cost parameters, reflecting possible challenges related to the execution of the differential experiments requested to achieve the aimed reductions of the accuracies. By this, the resulting target accuracies on nuclear data here presented are deemed useful to obtain information for the high-priority lists driving the selection of isotopes and reactions for future refinement experiments.



中文翻译:

先进反应堆的核数据目标精度要求:ALFRED 案例

不确定性估计对于合理的评估和明确的安全裕度定义至关重要,而这反过来对于安全当局批准新核反应堆的许可至关重要。此外,不确定性对于目标精度要求 (TAR) 也很重要,其实现可以揭示新的或增强的机会。多年来,目标精度要求的概念一直是 Massimo Salvatores 回归的焦点之一,他最近刚刚在 OECD/NEA 国际核数据评估合作工作组 (WPEC) 内重新启动了一项更新练习,旨在提供新的估计将面向未来的先进系统作为参考。

这项工作对先进铅冷快堆欧洲演示器 (ALFRED) 的主要核心积分参数的当前精度进行了评估,作为讨论哪些目标值可能会对设计带来有益改进的起点。尽管使用了最新的核数据库之一 (ENDF/B-VIII.0),并且 ALFRED 根据其作为示范者的使命在设计中设定了广泛的利润,但在倍增因子上仍有改进的余地。然后,从积分参数上的目标精度出发,求解逆不确定性问题,推导出相应的核数据上的目标精度,满足前者的目标精度。引入三组不同的成本参数解决了逆问题,反映了与执行差异化实验相关的可能挑战,以实现目标的准确度降低。通过这种方式,此处提供的核数据的最终目标精度被认为有助于获取高优先级列表的信息,从而推动同位素和反应的选择,以用于未来的精炼实验。

更新日期:2021-07-12
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