Process for encasing radioactively contaminated solid substances or solid substances containing radioactive substance from nuclear plants in a matrix suitable for permanent storage

摘要

Radioactively contaminated solids or solids containing radioactive substances from nuclear plants are encased in a matrix suitable for permanent storage by producing a mixture of radioactive solids and glass frit in a container suitable for final storage and pressure sintering the mixture. The glass frit is introduced in a quantity corresponding to 30 to 90% by weight with respect to the weight of the mixture. The mixture in the container is pressure sintered in a sintering furnace for a period between 15 minutes and 50 hours at a pressure in the range between 20 and 500 bar and at a temperature in the range from 650 DEG K to 950 DEG K to form a solid body.