b'Figure 3. 3D nCT renderings and visual examination of SETH-E showing the disrupted fuel rodlet, relocation of melted cladding, and droplets of cladding material down the sides of the pellets (i.e. candling). Temperature transition regions are apparent, where cladding exceeded or stayed below the melting temperature. As previously explained, the rendering contains several periodic artifacts as a result of the rendering engine used. The false colors shown in the nCT rendering have no scale or specific quantitative value but are applied to highlight finer features in the tomography which otherwise are difficult to visualize.SETH-E well exceeded the claddingRetrievable Capsule Holder (MARCH) melt temperature resulting in grossirradiation device are considered cladding relocation. The differenceready for use in future fuel safety in gross cladding relocation wasresearch applications.observed to be sensitive to temper- Future work on the material from ature-driven viscosity and the timethis test series includes performing above the cladding melt temperature,destructive characterization such as both of which enhance viscous flow.optical microscopy with the intent Finally, the use of separate effects teststo identify fuel cladding interac-using the SETH capsule-irradiationtion, cladding phase changes, melt/device was shown to be viable andre-freeze fonts, voiding, cladding the correct qualitative failure mecha- cracks, etc. It is intended to make this nisms were predicted, demonstrated,additional information available once and observed.The combination ofthis work has been completed.TREAT and the Minimal Activation 2020|AFC ACCOMPLISHMENTS 115'