Metallic residues after hydriding of zirconium

As a part of the production of nitride nuclear fuel for use in fast nuclear reactors, zirconium is hydrided followed by nitriding and mixing with uranium nitride. This work concludes a study of unwanted metallic particles present in a powder that is supposed to be a zirconium hydride. Sponge zirconium was hydrided at different temperatures and different time intervals, and the resulting hydride was milled into a powder. The powders were analyzed using SEM and XRD after which the powders were pressed into pellets for light optical microscopic study. The primary goals were determination of the structure of the particles and thereafter elimination of them. It was seen that hydriding at 500 C results in less metal particles but more experiments need to be conducted to confirm this

Metallic residues after hydriding of zirconium

As a part of the production of nitride nuclear fuel for use in fast nuclear reactors, zirconium is hydrided followed by nitriding and mixing with uranium nitride. This work concludes a study of unwanted metallic particles present in a powder that is supposed to be a zirconium hydride. Sponge zirconium was hydrided at different temperatures and different time intervals, and the resulting hydride was milled into a powder. The powders were analyzed using SEM and XRD after which the powders were pressed into pellets for light optical microscopic study. The primary goals were determination of the structure of the particles and thereafter elimination of them. It was seen that hydriding at 500 C results in less metal particles but more experiments need to be conducted to confirm this

Thermodynamic assessment of the Fe-Ni-Te system

International audienceFor the purpose of modelign internal corrosion of the stainless steel fuelpins in fast nuclear reactors, the present work presents a thermodynamic descriptionof the Fe–Ni–Te system modeled using the Ionic 2-sublattice liquidmodel. The liquid did not require much adjustment from the extrapolationfrom the binary Fe–Te and Ni–Te systems, however the Fe–Te system requiredsome re-optimization in order to remove newly discovered invertedliquid miscibility gaps at high temperatures

Thermodynamic assessment of the Ni–Te system

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Experimental phase diagram study of the Fe–Ni–Te system

International audienceThe Fe–Ni–Te alloys have been experimentally studied using Isothermal heattreatments with SEM-EDS and WDS, XRD, and DTA in order to add phasediagram data for a thermodynamic assessment. This is for the application offission product-induced corrosion of the stainless steel cladding of nuclear fuelpins, where Te is a key element. Phase diagram data is presented at 700 Cand 800 C, together with the solidus and liquidus temperatures across theentire system