With increasing reaction time, the cross linking reaction proceeded from the surface to core gradually to give a gelatin material with cross-linking degree gradient across the section.
FITLINK is one of main programs of NDFMPS that is core nuclear design and fuel management program system, and is a treatment program of crosssection parameter of fuel assembly.
Under shock load conditions the peak load can exceed the ultimate bending strength of the core material and fracture occurs, usually at the most highly stressed crosssection area.