KBS-3 (an abbreviation of kärnbränslesäkerhet, nuclear fuel safety) is a technology for disposal of high-level radioactive waste developed in Sweden by Svensk Kärnbränslehantering AB (SKB) by appointment from Statens Strålskyddsinstitut (the government's radiation protection agency).
The general theory is that radioactive rock in these sites has been present for thousands of years, and has not affected the health and well-being of human populations.
When initially made, the ceramic fuel is also wrapped in sealed tubes of corrosion-resistant zirconium alloy.
These safety factors multiply, extending the containment lifetime until most radioactive elements in the fuel have decayed, and only the longest-lived, least-radioactive isotopes remain.
[2] The risk of waste disposal is difficult to measure due to the necessity of gathering data over thousands of years.
[7] SKB undertook follow-up studies, which indicated that the corrosion process does not exist, and that the initial experiments were not correctly executed and/or the wrong conclusions were drawn.