Application of Inorganic SIAL Matrix and Movable Technology in Solidification of the TRU Sludges and Sludge/Resin Mixtures

The inorganic SIAL matrix for immobilization and solidification of radioactive waste was developed by AllDeco Company. The SIAL matrix is the product of polycondensation of inorganic compounds. Process of immobilization and solidification is running at room temperature. The application of the SIAL matrix was performed on various types of radioactive sludges, resins and sludge/resin mixtures from NPPs. Laboratory tests on waste fixed in the SIAL matrix have shown results with compressive strengths of the final product from 20 to 25 MPa and the indexes of leachability from 9 to 18. Different tailored mobile and remotely operated devices were designed and manufactured for the application of the SIAL matrix. Devices for the solidification are relatively small, lightweight and designed for the application on site, directly 'in situ' or near localized sludges or resin occurrences. The solidification of sludge/resin mixtures was realized into 60-liter or 200-liter drums. Also TRU radioactive sludges were solidified 'in situ' in original canisters used for storage and cooling of spent fuel assemblies. (authors)