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2014 ANNUAL REPORT 81 Neutron irradiation not only dramati- cally increases the size of G-phase precipitates in the stainless steel samples but increases the amount of chromium Cr phosphorous P and molybdenum Mo and decreases the iron Fe and manganese Mn Figure 2.This study proves that the effects of neutron irradiation on ferrite degradation are highly dependent on the irradiation dose rate at an LWRs operational temperatures. Researchers postulate that a synergistic effect exists in duplex stainless steel Distributed Partnership at a Glance ATR NSUF and Partners Facilities and Capabilities Center for Advanced Energy Studies Microscopy and Characterization Suite Collaborators University of Florida YongYang principal investigatorWei-yang Lo graduate student collaborator Zhangbo Li graduate student collaborator Argonne National Laboratory Yiren Chen co-principal investigator University of Wisconsin - Madison Janne Pakarinen co-principal investigator Aged Aged IrradiatedAs-cast Irradiated Figure 2. G-phase precipitates in aged cast-irradiated and aged-irradiated CF-3. Image sizes reflect identical scales and the blue dots represent Cr atoms. The concentrations of the iso-surface plots of Mn nickel Ni and silicon Si are 5 20 and 15 at. respectively. Understanding the effects of long-term thermal aging and neutron irradiation on duplex stainless steels in LWRs will provide a strong scientific basis for managing LWRs as they age beyond their designed-for lifetimes. YongYangAssistant Professor Nuclear EngineeringUniversity of Florida components between thermal aging and neutron irradiation even at very low doses. Future Activities The project was completed in 2014. Publications and Presentations 1. W-Y LoY. Chen J. PakarinenY. WuT. Allen andY.Yang Irra- diation response of delta ferrite in as-cast and thermally aged cast stainless steel submitted to Journal of Nuclear Materials 2014 under revision.