Portioning and Transmutation is the separation and fissioning of the minor actinides and some long-lived fission product from the spent nuclear fuel. In this review, the impact of partitioning and transmutation of nuclear waste based on radiotoxicity, geological repository, proliferation concern and the technological requirement to be fully implemented has been discussed. A summary of the advan...

A new system for spin resolved photoelectron spectroscopy and bremsstrahlung isochromat spectroscopy has been built and commissioned at Lawrence Livermore National Laboratory for the investigation of the electronic structure of the actinides. Actinide materials are very toxic and radioactive and therefore cannot be brought to most general user facilities for spectroscopic studies. The technical...

The global energy context pleads in favour of a sustainable development of nuclear energy since thedemand for energy will likely increase, whereas resources will tend to get scarcer and the prospect ofglobal warming will drive down the consumption of fossil fuel sources.How we deal with radioactive waste is crucial in this context. The production of nuclear energy inFrance h...

High-level waste (HLW) is a waste associated with the dissolution of spent nuclear fuel for the recovery of weapons-grade material. It is the priority problem for the U.S. Department of Energy's Environmental Management Program. Current HLW treatment processes at the Savannah River Site (Aiken, SC) include the use of monosodium titanate (MST, with a similar stoichiometry to NaTi2O5 x xH2O) to c...

Materials developed for radionuclide adsorption need to resist harsh conditions, i.e. be robust against ionizing radiation. In this work, we evaluated the degradation of mesoporous silicas (SBA-15) grafted with hydroxypiridinone, acetamide phosphonate and propionamide ligands under electron irradiation. The contained amide and/or phosphinic acid functional groups, which made them able bind acti...

The goal of this project is to examine the potential for using optical spectroscopy techniques, such as UV-Visible Spectroscopy and Laser Fluorescence Spectroscopy, for special nuclear materials accountability applications for the UREX+ and other solvent extraction processes. To increase the inherent proliferation resistance of the solvent extraction process, it is necessary to develop on-line ...

Research and development ,works on accelerator-based nuclear waste transmutation are carried out at JAERI under the national program OMEGA. The preliminary design of the ~proposed minor actinide transmutation plant with a solid targetkore is described. The plant consists of a high intensity proton accelerator, spallatkm target of solid tungsten, and subcritical core loaded with actinide alloy f...