Merry Christmas
We would like to wish everyone a Merry Christmas. It has been a very interesting work year that has been dominated by a few projects. We are very pleased with the first phase of Task 9, an international project focusing on matrix diffusion and other retention processes in crystalline rock. There have also been a number of other interesting projects focusing on radionuclide transport and risk assessment, concerning SKB's existing and planned repositories. Moreover, we have become involved with the inventory and final coverage of landfills in a few locations in Sweden. So to all our customers and co-workers; thank you for this year!
Different projects
New projects in 2015 include working with Assessment Model Flow charts for SFL, which is a future geological repository for radioactive waste that is being planned by SKB. There is also the Task 9 project, that is part of the SKB Task Force on Modelling of Groundwater Flow and Transport of Solutes, which is shifting gear. Niressa, together with Citres AB, continues to work with municipal and industrial waste management and water quality control programs on a number of sites in Stockholm, Södermanland and Värmland Counties. Sadly we can report that the SAFEROCK project, which was intended as a international research program on solute transport and retention, funded by EU, has been cancelled by the European Commission.
Review of part of Posiva's application for a Finnish final disposal for spent nuclear fuel.
In the spring of 2013, Niressa will review part of the documentation that Posiva Oy will submit to the Finnish authorities concerning an application for a final disposal for spent nuclear fuel at the Olkiluoto site.
Niressa involved in water contamination project.
Niressa has together with its partner Citres AB evaluated water contamination levels at a former landfill site for municipal and industrial waste in Stockholm, Sweden. Niressa is also part of the Avfall Sverige project on a Handbook for landfill gas.

Scientific article included in Euratom's Crock workshop proceedings
Martin Löfgren is one of the cowriters to the article: Determination of Rock migration parameters (Ff, De): Application of electromigration method on samples of different length, by P. Vecernik, V. Havlova, M. Löfgren, 2012. The proceedings can be downloaded at the Crock website.

Martin Löfgren presents at the Euratom's Crock workshop
Between the 22nd and 24th of May, the Crock (Crystalline Rock Retention Processes) workshop will be held in Stockholm Sweden. The Crock program is sponsored by the European Commission and Euratom. Martin Löfgren will hold a presentation titled “Amounts and distribution of fracture minerals available for reaction in crystalline rocks”. For more information, turn to the Crock website.

Niressa helps the Finnish program for disposal of spent nuclear fuel.
Niressa is currently aiding Helsinki University and the Finnish laboratory program for radionuclide retention properties in the geosphere, directed by Posiva. The project concerns a novel method of measuring matrix diffusion properties in the rock.

The laboratory program has as one of the aims to perform comparative measurements to those of the planned in-situ tracer tests at Onkalo, Finland. A comparative study in respect of the planned in-situ electrical logging of the rock matrix formation factor is a focus of attention. Much information about the Finnish program REPRO on retention properties in rock at Onkalo is found in the Posiva Working Report 2009-31.

The publication list has been updated
A few more recently published SKB reports, produced by staff of Niressa and other co-workers, have been added to the pubication list.

SKB hands in application for a final repository
Today the Swedish Nuclear Waste and Management co., SKB, hands in the application for a final repository for spent nuclear fuel in Forsmark, Sweden. A foundation for the application is the long-term safety assessment in which Niressa has played a part.

The Swedish KBS-3 concept for a geological repository for spent nuclear fuel is to encapsulate the spent fuel in corrosion resistant copper canisters with cast iron inserts. The canisters are surrounded by a barrier of very compacted bentonite clay, through which transport of solutes is diffusion controlled. The repository is placed at about 500 m depth in the crystalline rock, where chemical conditions are stable and groundwater flow is limited. This is illustrated in the below figure by SKB.

The long-term safety assessment SR-Site is presented in a main report that has 16 main references. One of these main references is the SR-Site Data report, which gives the data identified as essential for assessing the long-term safety of a KBS-3 repository. In addition, the process of qualifying the data for use in subsequent modelling is detailed. Niressa has been engaged in producing this report, with aid from a number of experts from Sweden and Europe. More about the application is found at the SKB website.

Niressa part the safety assessment for decommissioning waste from the nuclear power plant Barsebäck in Sweden.
Niressa is currently part of performing the safety assessment for an extended SFR, which is a low and intermediate level waste facility that, for example, will accommodate decommissioning waste from the nuclear power plant Barsebäck.
© Niressa, 2015