b'Achieving the objectives noted above, that is developing alloys that can attain very high burnups in a fast neutron flux and thereby maximize nuclear fuel utilization and minimize nuclear waste, requires an alloy that can perform its function in a radiation environment at Figure 2. 14YWT starting doses greater than 400 thick-wall tube and thin-walltube after pilgering. displacements per atom (dpa) which promote low temperature as feed rates, rotation rates, andembrittlement, radiation reduction schedules per pass, asinduced segregation, applicable to the successful forming ofhigh temperature14YWT thick-walled tubes into thin- helium embrittlement, walled tubes. These parameters wereswelling and developed by pilgering successfullyaccelerated creep, and in sequence stainless steel, and oxidechemical interaction dispersion alloy MA956, and then thewith the fuel.14YWT is objective alloy 14YWT.Two thin-wallsuch an alloy and the tubes of 14YWT were successfullyability to form it into pilgered this fiscal year and theseengineering shapes is are shown in Figures 2 and 3. being developed.Characterization of the finished tubes was performed in a joint collaborative effort between PNNL and Dr. Stu Malloy at the LANL.Figure 3.Thin-wall 14YWT tube after pilgeringlength 8.13 Inches.2019|AFC ACCOMPLISHMENTS 193'