Abstract
The Swedish concept of deep underground nuclear waste disposal is described. This system is based on multiple barriers isolating the fuel from the biosphere. The barriers are: the spent fuel material, which has a very low solubility; the copper canister with its very high corrosion resistance in the actual environment; the buffer material, which limits the amount of groundwater that can be in contact with the canister; and the bedrock, which has a low hydraulic conductivity and a high capacity for sorption of radionuclides. A number of scenarios have been studied in order to assess the effects of certain improbable events of conditions, such as early damage to a single canister, oxidising conditions throughout the whole geosphere and transport by colloids and complexing agents. The analysis shows that the calculated resulting doses to man are negligibly small compared with radioprotection standards and natural radiation levels
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