|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||Characterization of High Burnup Structure in LWR Irradiated Urania
||Kurt Terrani, Philip Edmondsson, Chad Parish, Tyler Gerczak, Charles Baldwin, Keith Leonard
|On-Site Speaker (Planned)
As irradiation of urania pellets in LWRs progresses, preferential burnup accumulation on the outer rim of the pellet coupled with lower temperatures result in heterogeneous restructuring of the microstructure. The resulting structure is referred to as the high burnup structure (HBS) with properties significantly different than the as fabricated fuel or the inner regions of the pellet irradiated at higher temperatures. In this study detailed characterization of the HBS is carried out using latest generation quantitative electron microscopy tools. The HBS was from a 15×15 PWR pin with an initial enrichment of 2.9wt% that was irradiated for seven cycles. Considering the relatively low initial fuel enrichment, and the relatively high discharge burnup, a large extent of the pellet area was transformed into HBS.
||Planned: A print-only volume