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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. KBS-3 is also to be used in Finland at the Onkalo spent nuclear fuel repository, being built by Posiva. == General == The disposal method consists of the following steps:〔(SKB explanation of its methodology )〕 * The waste is first stored in intermediate storage for 30 years. * The waste is encapsulated in cast iron canisters. * The cast iron canisters are encapsulated in copper (CuOFP alloy) capsules. * The capsules are deposited in a layer of bentonite clay, in a circular hole, eight meters deep and with a diameter of two meters, drilled in a cave 500 metres down into crystalline rock. * After the storage facility is full, the drill hole is sealed and the site marked. * After 100,000 years of storage, the radioactivity level of the waste is at the same level as that of uranium ore mined to make the fuel.〔Manson Benedict, Thomas H. Pigford, Hans Levi (1981). "Nuclear Chemical Engineering", McGraw-Hill, Toronto, 1981. ISBN 0-07-004531-3. This work shows data (Figure 11.2) indicating that enriched fuel from a light water reactor, subjected to a typical burnup regime will be no more radioactive than the ore from which it was mined, after a period of about six hundred years.〕 If the holes into the rock from the cave are drilled vertically, the method is called KBS-3V and if they are drilled horizontally it is called KBS-3H. The only method considered so far is KBS-3V. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「KBS-3」の詳細全文を読む スポンサード リンク
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