AGR-2 As-Irradiated UCO Compact 5-4-2 PIE Report

Destructive PIE and Safety Testing of Six AGR-2 UO₂ Capsule 3 Compacts

“…The gaps in the buffer terminated at a dense buffer region located at the kernel/buffer interface. This dense buffer region was a common feature in many Capsule 3 particles and was also see in UCO TRISO particles (e.g., Hunn et al 2018c). Analysis of the dense buffer region with EDS, as discussed in Section 7, showed the presence of uranium and several fission products.…”

Summary of the Postirradiation Examination of the First Samples from a MiniFuel Irradiation

“…This interaction was primarily caused by fission fragment recoil into the buffer. This is often observed in uranium oxide / uranium carbide kernel TRISO particles [25][26][27][28][29]. A slight gap (~10 µm) opened between the kernel and the buffer, which is also typical and may simply be due to thermal expansion mismatch.…”

AGR-2 Loose Particle Heating Tests in the Furnace for Irradiated TRISO Testing

“…The as-irradiated AGR-2 Compact 5-4-2 average fast fluence was 3.14 ´ 10 25 n/m 2 (E > 0.18 MeV), the burnup was 12.03% fission per initial metal atom, and the compact time-average, volumeaverage temperature was 1,071°C (Hawkes 2014, Sterbentz 2014. Prior to thermal exposure, the individual particles were subjected to deconsolidation leach-burn-leach (Hunn et al 2018b) to determine the concentration of fission products outside the SiC layer and to identify possible failed particles. After the deconsolidation, the particles were liberated from the compact, and after the burn stage, the residual matrix and OPyC layers were removed.…”