Gaseous fission product transport and release has a large impact on fuel performance, degrading fuel and gap properties. While gaseous fission product behavior has been investigated with bulk reactor experiments and simplified analytical models, recent improvements in experimental and modeling approaches at the atomistic and mesoscales are beginning to reveal new understanding of the unit mechanisms that define fission product behavior. Here, existing research on the basic mechanisms of fission gas release during normal reactor operation are summarized and critical areas where work is needed are identified. This basic understanding of the fission gas behavior mechanisms has the potential to revolutionize our ability to predict fission product behavior and to design fuels with improved performance. In addition, this work can serve as a model on how a coupled experimental and modeling approach can be applied to understand the unit mechanisms behind other critical behaviors in reactor materials.

气态裂变产物的运输和释放对燃料性能，燃料和间隙性能降低有很大影响。尽管已经通过本体反应器实验和简化的分析模型对气态裂变产物的行为进行了研究，但是原子级和中尺度的实验和建模方法的最新进展开始揭示了对定义裂变产物行为的单元机制的新认识。在此，总结了有关正常反应堆运行期间裂变气体释放的基本机理的现有研究，并确定了需要开展工作的关键领域。对裂变气体行为机理的基本了解可能会改变我们预测裂变产物行为和设计性能得到改善的燃料的能力。此外，