b'Figure 2. Long, instrumentedallow them to weld on to the fuelThis will minimize the stress state fuel pins protruding frompin body. The upper assembly of theand, thus, creep for the bellows for the top of ATF-2C tier 4 TC instrumented pins is shown ina large portion of irradiation while Figure 2. The accuracy of the typeretaining reasonable resolution.N TCs is0.75% the temperature reading; with drift due to thermo- Accomplishments:element transmutation expectedIn FY23 the final assembly of the to be -0.45% at around 1021 nvt ATF-2C test train was completed showing a good calibration over theand the test was installed into the life of the TC. The other two instru- reactor. The first cycle of irradia-mented pins will contain pressuretion concluded on June 19, 2023, bellows and a LVDT measurementwith approximately 54 effective assemblies. Because this is a long- full power days of irradiation. Peak duration irradiation, during whichburnups for chrome coated clad-creep can be a significant concern,ding test pins carried over from the bellows assemblies will have aATF-2B reached 3334 GWd/MTU weephole to allow precise selectionof burnup after their 8th cycle of of pressure at the beginning of life.irradiation. The SiC-SiC test pins reached nearly 1 dpa of damage 72 2023|AFC ACCOMPLISHMENTS'