b'Figure3. Comparison of the cavitynents, providing an important toolloops, cavities, radiation-induced size distribution at dpa in dual ionfor utilities in predicting componentprecipitates and radiation-induced irradiated T91 with 4 appm He/ degradation, and providing the basissegregation observed in BOR60 dpa and BOR-60 irradiated T91.for development of new alloys thatirradiated T91 were also observed in (Stephen Taller)improve the safety, reliability andDI-irradiated samples. A temperature economics of reactors in the currentshift of 70C (to 445C) for DI fleet and also advanced reactors.irradiation was found to produce Accomplishments:comparable dislocation loop The microstructure of alloy T9and cavity microstructures with irradiated in the BOR-60 reactor andBOR60 irradiation. The bimodal with dual ion (DI) beams at 360Cdistribution of cavities was also was characterized to establish theaccurately captured by DI irradiation. optimum ion irradiation conditionsSegregation of Cr to grain boundaries for ion irradiation to produceand formation of Ni-Si rich clusters microstructures that match thosewas insignificant in the DI irradiated from reactor irradiation at nominallyT91 compared to the BOR60 360C. The actual reactor irradiationirradiated T91. The enrichment temperature was 378C.Dislocationof Cr at the grain boundary in DI irradiated T91 is much lower than that observed in BOR60 irradiated 184 2019|AFC ACCOMPLISHMENTS'