Abstract
UCO and UO2 tristructural isotropic fuel compacts were irradiated in the AGR-2 experiment, conducted in the Advanced Test Reactor for 559.2 effective full power days. UCO and UO2 compacts reached calculated peak burnups of 13.15 and 10.69% fissions per initial heavy-metal atom, and fast fluences of 3.47 × 1025 and 3.53 × 1025 n/m2 (E > 0.18 MeV), respectively. The time-average volume-average temperatures ranged from 987 to 1296 °C in UCO compacts and from 996 to 1062 °C in UO2 compacts. Fission product release-to-birth (R/B) ratios remained below 2 × 10−6 in UCO compacts and 10−7 in UO2 compacts during the first three irradiation cycles. R/B data then became unreliable due to mixing of the capsule gas flows which hindered the evaluation of fuel performance for the later portion of the irradiation. Post-irradiation examination of the irradiation capsules and fuel compacts is underway and will provide additional information on fuel performance.
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