Workreport 2020-3



Materials of the Disposal Facility - Update of Estimated Quantities


Karvonen, T. H., Sacklén, N.



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A range of materials are used during the construction process and the operation of the disposal facility for spent nuclear fuel at Olkiluoto in Eurajoki, Finland. In addition to materials necessary for the construction and operation, some materials may be transported into the disposal facility with the ventilation air, as residues from vehicles etc. Both two types of materials are considered here, and the masses of these materials, introduced and estimated to remain after closure, are presented here based on the most recent information. The purpose of this work is to update the previous estimates, and it takes advantage of the experience collected during the construction of the underground rock characterisation facility ONKALO®at Olkiluoto and the start of construction of the disposal facility, for which Posiva gained the construction licence in 2015. The installed material masses as well as designs and preliminary designs have been used in estimating and calculating the safety-classified materials.

The estimations made in this report are specific to a KBS-3V type disposal facility. In some cases, more generic information has been used, particularly when the relevant masses have not been monitored, such as stray particles. The estimations are based on the new disposal facility layout produced in 2015 and consider the plans for grouting, rock support and excavation current at the time this report was compiled. As all these plans are not final, some masses may be different in future and differences between estimates and final realised masses can occur.

The report presents material masses for different volumes. In addition to results for the entire disposal facility, results have also been calculated for the deposition holes, deposition tunnels, central tunnels, vehicle connections, canister shaft and low and intermediate level waste repository.

The most significant remaining material is rock material, the mineralogical composition of which has not been specified in this report. Rock material is utilised in closure backfills and in concrete constructions such as plugs. Other substantial masses include the various minerals of buffer, backfill and closure materials and materials of other engineered barrier system components.  Of construction materials that remain in the disposal facility, steel, cement, silica and fly ash comprise the largest masses. As the aim has been from the start of the construction to minimise the remaining construction material masses, it is clear from the results that the largest material masses are those of the EBS components.

When comparing the results of this work and Karvonen (2011), the correlation is good. Differences that appear large at first look between the results are due to different methods of reporting and calculating. Elaborate discussion of this subject is given in Chapter 10 of this report.


Foreign materials, stray materials, remaining materials, construction materials, repository, KBS-3V, safety-classified materials


WR 2020-03_web (pdf) (3.2 MB)


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