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Properties of Solidified HLW and Their Changes Under Storage and Disposal Conditions

by A. S. Nikiforov, All Union Scientific Research Inst, of Inorganic Materials, Moscow, Russia,
A. S. Polyakov, All Union Scientific Research Inst, of Inorganic Materials, Moscow, Russia,
N. V. Krylova, All Union Scientific Research Inst, of Inorganic Materials, Moscow, Russia,
R. N. Salamatina, All Union Scientific Research Inst, of Inorganic Materials, Moscow, Russia,
V. I. Vlasov, All Union Scientific Research Inst, of Inorganic Materials, Moscow, Russia,
A. A. Bochvar, All Union Scientific Research Inst, of Inorganic Materials, Moscow, Russia,



Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1991

Abstract:

The paper gives the results of the studies of the properties of different solidified high level waste (HLW) - vitreous (phosphate and borosilicate) composites as well as glass ceramics and alumoferrosilicate composites. Major attention is paid to factors that influence the extent of radionuclide localization. Consideration is given to radionuclide localization and delocalization and to changes in other properties of solidified HLW during storage and burial. The first period takes place under high temperature conditions without any contact with water (interim subsurface storage conditions). Assessments are given to the possible radionuclide delocalization when solidified HLW is stored in the absence of water, to the effects of radiation and thermal loads on its properties. Variations in material thermal stability are shown to depend on vitrification and storage conditions. In the second period when the radioactive decay temperature is lowered the contact between radioactive materials and water (burial conditions) is possible. Chemical stability variations induced by the preliminary effect of elevated temperature and radiation similarly to structural changes depend on material composition, its heat release (specific activity), heat transfer and disposal conditions, chemical composition of stratal water contacting solidified waste and the rate of stratal water motion.

Subject Headings: Solidification | Radioactive wastes | Radioactive materials | Chemical wastes | Waste disposal | Waste storage | Temperature effects

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