Kara Luitjohan
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View article: Uranium Processing Signatures for Nuclear Forensics (NA22 End of FY23 Report)
Uranium Processing Signatures for Nuclear Forensics (NA22 End of FY23 Report) Open
A vacuum induction melting (VIM) furnace was used to produce an ~120 kg depleted uranium (DU) rod in November 2021 from well characterized feedstock to investigate the separation of thorium (Th) and protactinium (Pa) from uranium (U) durin…
View article: Investigation of Carbide Inclusions in Cast Uranium [Slides]
Investigation of Carbide Inclusions in Cast Uranium [Slides] Open
Outline - Introduction: The motivations for the project, and some background on inclusions in uranium, and about the samples; Lath Inclusion Morphology: Looking at the morphology of a specific family of carbide inclusions in casting 20; Cl…
View article: Solidification Science at Sigma Overview [Slides]
Solidification Science at Sigma Overview [Slides] Open
offers diverse, complex, and valuable building blocks and products. Second, Consortium researchers developed technologies to enable process intensification, which can reduce equipment needs, energy consumption, and waste generation, thereb…
View article: U-rich U-Mo Solidus, Liquidus, Enthalpy, and Thermal Diffusivity
U-rich U-Mo Solidus, Liquidus, Enthalpy, and Thermal Diffusivity Open
Several material properties have been studied as a function of composition as part of the USHPRR effort to use U-10Mo for LEU monolithic fuel foils, with special attention to areas where simulation outcomes can be improved. The liquidus an…
View article: Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb): Final Project Report
Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb): Final Project Report Open
This report summarizes the outcomes of a 3-year NA-22 exploratory project to research the feasibility of tagging uranium materials, especially nuclear fuels, for nuclear nonproliferation purposes. The experimental focus was on metallic ura…
View article: Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb) (Annual Report for FY21)
Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb) (Annual Report for FY21) Open
This report describes the outcomes of the third and final year of a project to research the feasibility of tagging uranium materials, especially nuclear fuels. The experimental focus remained on metallic uranium forms under prospective sur…
View article: Microwave Cast Material Examination
Microwave Cast Material Examination Open
Microwave-cast material dating from the latest prototype development period and subsequent TRL 7 advancement testing was sent to LANL for additional characterization. The initial characterization described here is considered a supplement t…
View article: Effect of Solute Elements on Boron Segregation in Boron-Containing Steels
Effect of Solute Elements on Boron Segregation in Boron-Containing Steels Open
The addition of boron to steel alloys results in an increase in both hardenability and casting defects. The casting difficulties are predicted to stem from a metatectic reaction, δ + γ → L + γ, where a fully solidified material begins to l…
View article: Effect of Filtration on Inclusion and Carbon Reduction (FY19 Report)
Effect of Filtration on Inclusion and Carbon Reduction (FY19 Report) Open
Casting of U-10Mo using vacuum induction melting (VIM) technology has been selected as the first processing step for the conversion of high-enriched uranium based fuels to low-enriched uranium based fuels. One source of potential variabili…
View article: FY18 Report: HFIR Fuel Casting Support and Microstructural Feature Examination
FY18 Report: HFIR Fuel Casting Support and Microstructural Feature Examination Open
An effort to commence conversion of the High Flux Isotope Reactor (HFIR) to a low enriched uranium (LEU) based fuel has been proposed. While recent experience from LEU-10wt%Mo (U-10Mo) monolithic metal fuel production may be leveraged cons…