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 technology was developed by studying different natural storage facilities such as the natural reactor in Oklo, Gabon, and the uranium mine in Cigar Lake, Canada. 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. KBS-3 is also to be used in Finland at the Onkalo spent nuclear fuel repository, being built by Posiva.