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Workreport 2007-105



KBS-3H Design Description 2006


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



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This document provides the status of the design description of a KBS-3H repository design alternative as of early 2006. The design is in progress and the main objective of this document is to provide a description of the status of the design for the safety assessment. 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. In this report, the number of alternative technical design solutions has been reduced from the previous design description. Additionally, the design of some components has been developed further, most significantly that of the compartment plug and bentonite distance blocks. This report also summarizes the most important new research findings and highlights differences with respect to the previous design description. Two different alternative KBS-3H designs, Basic Design (BD) and Drainage, Artificial Watering and air Evacuation (DAWE), which have both been assessed as being technically feasible, are presented together with estimated groundwater inflows, sealing techniques, Olkiluoto-specific layout and estimates of amount of residual materials. Both alternatives have still uncertainties and the design developments to resolve these are in progress. The distance block in the BD alternative is the design component, for which significant uncertainties have been identified concerning buffer behaviour, design requirements and design basis. These critical issues and related uncertainties have significant impact on the final selection of the design, which may differ from the present understanding.

This report is a result of a joint project between Posiva and SKB. This report will also be printed as SKB Report R-08-32.


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


KBS-3H Design Description 2006 (pdf) (14.2 MB)


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