本报告是《先进核燃料元件设计研究及材料研制》国家重点研发计划专题4.2“耐事故燃料元件初步设计方案研究”的中期存档技术报告。专题4.2的最终目标是建立UN/U3Si2-FeCrAl高安全性燃料运行分析技术，采用有限元方法实现全尺寸元件性能分析。此目标基础上，本报告作为中期报告，建立UN/U3Si2-FeCrAl燃料元件辐照-热-力耦合分析技术，采用有限元方法实现12个芯块级的元件性能分析。

This report is the interim archived technical report of the Special Topic 4.2 "Preliminary Design Scheme Study of Accident-Resistant Fuel Elements" of the National Key R&D Program of Advanced Nuclear Fuel Element Design and Material Development. The ultimate goal of Topic 4.2 is to develop a high-safety fuel operational analysis technique for UN-U3SI2 /FeCrAl, using finite element methods for full-size element performance analysis.Based on this objective, this report, as an interim report, establishes the irradiation-thermal-mechanical coupling analysis technology for the UN-U3SI2 /FeCrAl fuel element, and uses the finite element method to realize the performance analysis of the element at the level of 12 pellets.