Method for anchoring radioactive substances in a body resistant to leaching by water
A method is described for containing high-level radioactive waste in a body resistant to leaching by water. The process includes steps for mixing the radioactive substances with a material which is resistant to leaching by water, or a material which when heated becomes resistant to leaching. Examples of such materials include insoluble salts or compounds of the radioactive substances such as titanates, silicates, zeolites, aluminium oxide, titanium oxide, quartz and rocks existing in nature. The mass is then to be enclosed in a capsule, evacuated, and subjected to isostatic pressing at a temperature and pressure required for the formation of a coherent mass. The capsule material should be matched to the resistant material so that it has a sufficiently high melting point for the capsule to fulfill its duties, and essentially the coefficient of thermal expansion in the cases when the capsule is left to provide a reinforced containment. The pressure during the isostatic pressing should be between 50 and 300 MPa. The temperature may vary from 700/sup 0/C to 1300/sup 0/C. 19 claims, 2 figures.
- Assignee:
- ASEA AS
- Patent Number(s):
- US 4172807
- OSTI ID:
- 5045674
- Resource Relation:
- Patent Priority Date: Priority date 2 Nov 1976, Sweden
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HIGH-LEVEL RADIOACTIVE WASTES
LEACHING
RADIOACTIVE WASTE PROCESSING
SOLIDIFICATION
ALUMINIUM OXIDES
ENCAPSULATION
HIGH TEMPERATURE
LOW PRESSURE
MIXTURES
PRESSING
PRESSURE DEPENDENCE
QUARTZ
ROCKS
SILICATES
TEMPERATURE DEPENDENCE
TITANATES
TITANIUM OXIDES
VERY HIGH TEMPERATURE
ZEOLITES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DISPERSIONS
DISSOLUTION
FABRICATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MANAGEMENT
MATERIALS WORKING
MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
052001* - Nuclear Fuels- Waste Processing