2017 | AFC ACCOMPLISHMENTS 170 Radiation effects at displacement doses greater than 400 displacements per atom (dpa) in a reactor environment create a challenging environment to materials used for cladding and ducts.The activity is investigating processes for fabricating promising radiation tolerant materials for cladding, specifically using extrusion and pilgering processes in a sequential mode. Project Description Extrusion and pilgering are promising techniques for fabricating advanced alloys such as MA956 and 14YWT suitable for producing tubing for reactor use.This project is using the extrusion press located at the Pacific Northwest National Laboratory (PNNL) to perform sequential extrusions followed by pilgering using the pilger mill located nearby as Sandvik Special Metals.The goal and objective is to produce tubing samples with dimensions for in-reactor use as specified by Los Alamos National Laboratory (LANL). Advanced Reactor Cladding Tube Pilgering Process Development (PNNL) Principal Investigator: Curt Lavender and Ron Omberg Collaborators:Wendy Bennett and Marie McCoy at PNNL and Bob Johnson at Sandvik Specialty Metals Cladding developed with these processes will produce: (1) a more radiation tolerant fuel cladding on high strength materials that cannot be processed by conventional means, (2) a fuel that can be used to a reduce of the half- life of isotopes in spent fuel that will need to be disposed of in the Yucca Mountain Repository, and (3) a fuel that can be used to improve the economics of Sodium Fast Reactors.