Abstract Burnup capability is developed on the ALPHA code with Sanchez-Pomraning MOC (Sanchez-MOC) approach for FCM fuel design. To better model the double heterogeneity (DH) of FCM fuel, ALPHA adopts a combination strategy of macroscopic discretization at pin level and microscopic discretization at particle level for burnup region. The burnup capability is validated by code-to-code comparison with Serpent for FCM fuel. In addition, the effect of spatial discretization of the burnup calculation on the macroscopic and microscopic level is analyzed. In this work, it is suggested that the FCM pin cell without poison or containing Er2O3 should implement the macroscopic 5-ring and microscopic non-discretization scheme. For B-bearing and Gd-bearing FCM pin cell, the macroscopic burnup region should reach 5 rings and 8 rings respectively, and their microscopic burnup region both require 2 regions.

中文翻译：

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轻水堆中基于Sanchez-MOC框架的双异质系统燃耗计算评价

摘要 燃耗能力是在 ALPHA 代码上使用 Sanchez-Pomraning MOC (Sanchez-MOC) 方法开发的，用于 FCM 燃料设计。为了更好地模拟 FCM 燃料的双非均质性 (DH)，ALPHA 对燃耗区域采用了针级宏观离散化和粒子级微观离散化的组合策略。通过与 Serpent 进行 FCM 燃料的代码到代码比较来验证燃耗能力。此外，分析了燃耗计算的空间离散化对宏观和微观层面的影响。在这项工作中，建议无毒或含有 Er2O3 的 FCM pin 电池应实施宏观 5 环和微观非离散化方案。对于含 B 和含 Gd 的 FCM pin cell，宏观燃耗区域应分别达到 5 环和 8 环，