b'Advanced Reactor Tube Processing DevelopmentPrincipal Investigators:Marie McCoy and Curt Lavender (PNNL)Team Members/Collaborators:Ron Omberg, Mark Smith and Mike Dahl (PNNL); Dr. Stu Malloy (LANL)Projection Description:One of the most promising alloys to provide the radiation tolerance required at high burnups is 14YWT.This alloy has a fine dispersion of oxide particles that have the advantage of serving as sinks for defects and thereby achieving very high burnups, but for which these finely dispersed oxide particles also make the processing of this alloy into engineering forms very difficult.The objective of this project is to perform the research and development (R&D) required to processes this alloy into engineering forms by extruding it into billets and then forming these billets into engineering tubes using the pilgering process.Accomplishments:A rolling mill at the Pacific Northwest National Laboratory (PNNL) was modified so that it could accomplish Figure 1. As machined roller diesT The main goal of this activitythe pilgering process and thereby used for pilgering in roller mill. is to perform the researchform thick-walled billets into thin-and development as neededwalled tubes.This required modifying to maximize nuclear fuel utilizationthe rolling mill by designing, while minimizing high level waste.Infabricating, and installing roller dies both the modified open and closedand mandrels.The roller dies are fuel cycle options, these goals areshown in Figure 1.Subsequent to accomplished through irradiatingthis, it was necessary to establish nuclear fuel and cladding to a verythe basic pilgering parameters such high burnup in a fast neutron flux.192 2019|AFC ACCOMPLISHMENTS'