Highly Dense Graphite Matrix: A New Material for the Conditioning of Radioactive Wastes
| Autor: | Milan Dipl Ing Dr Hrovat, Thomas Dipl C Schmidt-Hansberg, H. A. Pirk, Hans Huschka, Karl-Gerhard Hackstein |
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| Rok vydání: | 1983 |
| Předmět: |
Nuclear and High Energy Physics
Nickel sulfide Materials science Fabrication Waste management Metallurgy Radioactive waste chemistry.chemical_element Condensed Matter Physics Spent nuclear fuel Corrosion chemistry.chemical_compound Nickel Nuclear Energy and Engineering chemistry Graphite Waste disposal |
| Zdroj: | Nuclear Technology. 61:460-464 |
| ISSN: | 1943-7471 0029-5450 |
| DOI: | 10.13182/nt83-a33170 |
| Popis: | In continuation of 20 yr of experience with high-temperature gas-cooled reactor graphite fuel element fabrication (molded fuel spheres and monolithic block fuel elements), NUKEM introduced a new graphite-based material with an inorganic binder produced by molding. A mixture of nickel and sulfur is used as the inorganic binder for natural graphite powder. The fabrication is facilitated by the low temperature of 500/sup 0/ C in generating a chemically and thermally stable nickel sulfide. The newly developed material is suitable as a matrix for the fixation of high-active waste and as a corrosion-resistant layer of the steel supporting tube for final disposal of spent fuel elements. The material of natural graphite/nickel sulfide is distinguished by high density, high corrosion resistance, a low leaching rate, good thermal conductivity, an appropriate coefficient of thermal expansion, and high thermal stability due to the high melting point of nickel sulfide (790/sup 0/ C). Currently, a pilot plant for fabrication of containers for spent fuel elements is being erected. Additionally, development work is in progress to obtain basic design data for a high-level waste fixation facility. |
| Databáze: | OpenAIRE |
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