b'Figure 3. X-ray radiography of the assembled FAST capsules to be inserted into the small I position within ATR. As shown, some of the rodlets became slightly dislodged from the holding clip and are tilted or off centered. Thermal analysis was performed on these eccentricities and validated that there was no risk to the experiment objectives. This is due to the combination of the large sodium bond to balance out the temperature and the relatively far distance between the cladding and the gas gap.Figure 4. Linear heat generation rate (LHGR) of select FAST rodlets from the as-run neutronics analysis. LHGRs remained relatively constant throughout the irradiation cycle which is indicative of a relatively constant irradiation temperature (neglecting degradation in thermal transport properties as burnup increases). LHGRs were matched within 10% of the target LHGR.2021|AFC ACCOMPLISHMENTS 121'