燃料程序ALCYONE中PCI引起的应变集中的三维建模
3D modelling of strain concentration due to PCI within the fuel code ALCYONE
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中文总结 AI 辅助
本文应用ALCYONE三维方案预测燃料棒行为，验证其准确性，并揭示应力-应变集中仅在功率瞬态结束时出现且被蠕变松弛。
中文摘要 AI 辅助
本文中，燃料程序ALCYONE的三维方案被应用于一个数据库，该数据库包含超过50次基础辐照和斜坡测试，这些测试是在使用UO2、MOX或Cr掺杂UO2燃料以及Zy4或M5__包壳管、燃耗高达70 GWd/tU的燃料棒上进行的。通过比较以下实验和计算数据，证明了三维方案预测在斜坡测试期间位于最大线功率密度（LHR）处的单个燃料芯块-包壳单元行为的能力：基础辐照和斜坡测试后的残余包壳直径、基础辐照和斜坡测试后的芯块间和芯块中部凸起高度、斜坡测试后的碟形填充。在论文的第二部分，展示了捕捉三重点处应力-应变局部化的三维模拟。结果表明，应力-应变集中仅在功率瞬态结束时发生，并迅速被芯块和包壳的蠕变所松弛。
英文摘要
In this paper, the 3D scheme of the fuel code ALCYONE is applied to a database consisting of more than 50 base irradiations and ramp tests performed on rods with UO 2 , MOX or Cr-doped UO 2 fuels and Zy4 or M5__ cladding tubes with burn-ups up to 70 GWd/tU. The ability of the 3D scheme to predict the behaviour of a single fuel pellet -cladding element situated at the maximum Linear Heat Rate (LHR) during ramp testing is demonstrated by comparing the following experimental and calculated data: residual clad diameter after base irradiation and ramp test, height of inter-pellet and mid-pellet ridges after base irradiation and ramp test, dish filling after ramp test. In the second part of the paper, 3D simulations that catch the stress -strain localization at the triple point are presented. It is shown that the stress-strain concentration occurs only at the end of the power transient and is quickly relaxed by pellet and clad creep.
发表机构
- CEA, DEN, DEC/SESC（法国原子能和替代能源委员会，核能部，燃料循环与燃料技术处）
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