Image analysis was performed on SEM micrographs of recently irradiated UMo dispersion fuel plates. Detailed information on the fission gas inter-granular bubbles accompanying recrystallization, including average diameter, density and size distribution were extracted and compared with previous results on UMo and UO₂. A pore density drop was notice at high fission densities and attributed mainly to a pore coarsening dominated by irradiation induced phenomena. Based on the image analysis data and theoretical considerations, a model was developed to estimate the pressure inside the pores as a function of fission density, temperature and pore radius. The developed pressure can give indications of the mechanical stability of the fuel towards the progressive building-up of fission gases. Finally, the proposed methodology was applied to the nanobubble lattice decorating the fuel grains at low fission densities in order to infer the physical state of the contained fission gases. The estimated values suggest the presence of solid xenon precipitates.

在最近辐照过的UMo分散燃料板的SEM显微照片上进行图像分析。提取了伴随重结晶的裂变气体颗粒间气泡的详细信息，包括平均直径，密度和尺寸分布，并将其与先前关于UMo和UO _2的结果进行了比较。。在高裂变密度下注意到孔密度下降，并且主要归因于由辐射诱导现象主导的孔粗化。基于图像分析数据和理论考虑，开发了一个模型来估计孔内压力与裂变密度，温度和孔半径的关系。所形成的压力可以指示燃料对裂变气体逐渐积累的机械稳定性。最后，将所提出的方法应用于以低裂变密度装饰燃料颗粒的纳米气泡晶格，以推断所包含的裂变气体的物理状态。估计值表明存在固体氙沉淀。