对于UN材料，主要考虑空位扩散机制和位错湮灭机制下的蠕变，忽略位错攀移辅助滑移机制下的蠕变。晶粒尺寸、裂变率条件和温度、应力对UN的宏观蠕变率均有影响，考虑辐照的情况，在低温区，蠕变率对温度不敏感，随着裂变率增大，蠕变率增大，且蠕变率与裂变率近似成线性关系。在中高温度下，蠕变率对裂变率不敏感，随着温度升高，蠕变率增大。在极高温下，随着应力增大，蠕变率快速增大，且温度越高蠕变率对应力的依赖性越高。随着裂变率上升，温度不敏感区的范围逐渐覆盖更高的温度，应力对温度不敏感区的范围几乎没有影响。

For UN materials, the creep under vacancy diffusion mechanism and dislocation annihilation mechanism is considered, while the creep under dislocation climbing-assisted slip mechanism is neglected. Considering the irradiation, the creep rate is not sensitive to temperature in the low temperature region, and the creep rate increases with the increase of the fission rate, the relationship between creep rate and fission rate is approximately linear. At medium and high temperature, the creep rate is not sensitive to the fission rate, and the creep rate increases with the increase of temperature. At very high temperature, the creep rate increases rapidly with the increase of stress, and the dependence of creep rate on stress increases with the increase of temperature. With the increase of fission rate, the temperature insensitive region gradually covers the higher temperature, and the stress has little effect on the temperature insensitive region.