b'High Fidelity Simulation of High Dose Neutron IrradiationPrincipal Investigator:Gary S. Was, University of Michigan Team Members/ Collaborators:Steven Zinkle, Brian Wirth (University of Tennessee); Arthur Motta (Pennsylvania State University); Todd Allen, Fei Gao, Emmanuelle Marquis, Zhijie Jiao (University of Michigan); Stuart Maloy (Los Alamos National Laboratory)in-reactor and at high doses, using ion irradiation as a surrogate for reactor irradiations. Properties Figure1. Annular bright field imageincludes both physical properties of HT9 irradiated with dual ions(irradiated microstructure) and the (Fe and He) at 460 C to 16.6 dpa.mechanical properties of the mate-Electron beam is parallel to <311> zone axis. (He Li) rial. Demonstration of the capability to predict properties has two compo-nents.One is ion irradiation of a set of alloys to yield an irradiated microstructure and corresponding mechanical behavior that are substantially the same as results from neutron exposure in the appropriate reactor environment. Second is the The SNAP programI on irradiation coupled with thecapability to predict the irradiated absence of residual radioactivitymicrostructure and corresponding are the attributes that make thismechanical behavior on the basis of is developing theimproved models, validated against capability to simulateroute to advancing our understandingboth ion and reactor irradiations reactor irradiatedof radiation effects so attractive.Theand verified against ion irradiations. microstructures andlack of activation means that samplesTaken together, achievement of these mechanical propertiescan be handled as if they wereobjectives will yield an enhanced to high dose, pavingunirradiated, eliminating the needcapability for simulating the behavior the way for predictingfor the extremely high investmentof materials in reactor irradiations. microstructure andin time and cost connected with properties to highthe use of hot cells and dedicatedThe program consists of four dose to supportcharacterization instrumentation. Inmajor elements, or thrusts:1) the development oftotal, high damage rates mean thatestablishment of the capability advanced reactor20 years in reactor can be achievedto conduct dual- and triple- ion materials. in 2 days in an accelerator meaningirradiations that capture the key that ion irradiation is 10-1000x lesselements of the BOR-60 reactor costly and 10-100x quicker than testneutron spectrum and development reactor irradiation.of both ion and reactor irradiation Project Description:programs, 2) a description (both The objective of this proposal is toexperimental and computational) demonstrate the capability to predictof the evolution of the irradiated the evolution of microstructure andmicrostructure over a wide dose properties of structural materialsrange relevant to fast and thermal 182 2019|AFC ACCOMPLISHMENTS'