b'Figure 4. Irradiation test vehicles used to support the irradiation of alloys of interest for GE show both the new large diameter capsule above and the standardized tensile test geometry below. Both of these capsules will support the irradiation of candidate alloys in support of future iron based cladding deployments in current generation BWR and advanced reactor applicationsfabrication was initiated to irradiategather additional irradiated mate-FeCrAl alloys that are of interest to GErial data from production fuel and the Advanced Fuels Campaign.rods with local exposures near the These tests will utilize standard geom- current regulatory limit to support etry tensile specimens and standardupcoming licensing submittals. geometry bend bar specimens. Addi- This shipment will allow ORNL tionally, a new irradiation capsule wasto characterize high burnup BWR designed to accommodate the largerfuel including gadolinium doped diameter cladding utilized in BWRs.uranium dioxide fuel. This will be This irradiation will be the firstthe first examination of gadolinium irradiation of BWR geometry claddingdoped fuel in the U.S. that was in HFIR. Hydrodynamic testing of thisirradiated in a commercial reactor. new capsule was also completed as aThis fuel will enable the study of necessary step to approve the use ofuranium dioxide microstructure this large diameter irradiation vehiclechanges in BWR geometries for in HFIR. Sketches of both the standardcomparison against the formation of tensile specimen irradiation vehiclesimilar microstructures in pressur-and the large diameter claddingized water reactor conditions. The vehicle are included in Figure 4. evaluation of hydrogen pick-up and Planning is underway to receivethe accident behavior of BWR fuel irradiated fuel from the Clintonwill also be studied.Nuclear Power Station to support the High Burnup licensing efforts of GE. There is a pressing need to 2023|AFC ACCOMPLISHMENTS 77'