2017 | AFC ACCOMPLISHMENTS 30 Figure 3. Neutron radiographs of a stack of UN/U3Si5 fuel pellets (a) with measured 238U areal density (b). Neutron diffraction analysis (c) provides microstructural information (such as weight fractions of UN and U3Si5, d) and crystallographic information (such as unit cell volume of U3Si5, e). The texture information, represented as pole figures (f), indicates that while the UN grains of a random orientation distribution, the U3Si5 phase has melted during sintering and re-solidified as large single crystals, forming an interconnected matrix.