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POSIVA Report 2008-1



KBS-3H Design Description 2007


Anttila, P., Autio, J., Berghäll, J., Börgesson, L., Eriksson, M., Hagros, A., Halvarsson, B., Johansson, E., Kotola, R., Parkkinen, I., Rönnqvist, P-E. & Sandén, T.



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The presented KBS-3H design work was carried out in KBS-3H project in 2004 - 2007, which was a joint project between Svensk Kärnbränslehantering AB (SKB) in Sweden and Posiva Oy in Finland. The overall objectives of the project phase were to demonstrate that the horizontal deposition alternative is technically feasible and to demonstrate that it fulfils the same long-term safety requirements as the reference design KBS-3V. The KBS-3H design is a variant of the KBS-3 method and an alternative to the KBS-3V design. In the KBS 3H design alternative, multiple canisters containing spent fuel are emplaced at about 420 m depth in bedrock in parallel, 100 - 300 m long, approximately horizontal deposition drifts whereas the KBS-3V design calls for vertical emplacement of the canisters in individual deposition holes. As a result of design work, the two previous KBS-3H repository candidate designs called Basic Design (BD) and design based on Drainage, Artificial Watering and air Evacuation (DAWE) were developed on two different functional principles. At later phase of the project the BD alternative was found not to be robust in drifts with several large inflows and therefore a third less mature alternative called Semi Tight Compartments design (STC) was introduced to function in these conditions.

Significant effort was made in the project to resolve studies and testing the functional uncertainties related to buffer behaviour which could e.g. cause piping, erosion, displacement and rupture of distance blocks. Major work was also carried for the design of supercontainer, development of large-scale post-grouting device, Mega-Packer, for grouting of rock, excavation of deposition drifts, layout design and evaluation of residual materials. This report also summarizes and highlights differences between different design alternatives and gives reasoning why DAWE design alternative is seen as the most interesting for future development together with novel less mature STC-alternative. All alternatives have still uncertainties and a proposal is therefore presented of the issues that should be considered in possible next phase of work.

This report is a result of a joint project between Posiva and SKB. This report will also be printed as SKB Report R-08-44.


KBS-3H, horizontal emplacement, repository, nuclear waste


KBS-3H Design Description 2007 (pdf) (11.9 MB)


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