Publications produced by staff members, as well as company brochures, etc. SKB reports are linked to pdf-files at the SKB website.
M. Löfgren, 2014. Recommendation of rock matrix effective diffusivities for SR-PSU Based on formation factor logging in situ by electrical methods in KFR102B and KFR105 . SKB R-13-39, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: A report giving recomeded matrix diffusivities for the SKB safety assessment SR-PSU for the SFR facility in Forsmark.

P. Vecernik, V. Havlova, M. Löfgren, 2012. Determination of Rock migration parameters (Ff, De): Application of electromigration method on samples of different length. 1st Workshop Proceedings
of the Collaborative Project„Crystalline Rock Retention Processes“ (7th EC FP CP CROCK). KIT SCIENTIFIC REPORTS 7629. pp. 137-147.

Description: An scientific article presenting TEM (Through-electromigration) meassurments carried out by NRI (Czech Republic) on rock samples from the Äspö Hard Rock Laboratory, Sweden.

Löfgren M and Sidborn M, 2010. Statistical analysis of results from the quantitative mapping of fracture minerals in Oskarshamn. Site descriptive modelling – complementary studies. SKB R-09-31, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description:Within the Oskarshamn site investigation campaign, quantitative mapping of different fracture minerals has been performed. This has been done by studying fracture surfaces of drill core sections from many different boreholes. In this report, the data is statistically analysed both by parametric and non-parametric methods. This is done from the perspective of radionuclide transport modelling and hydrogeochemical modelling. This produces unprecedented quantitative information on the coverage and amounts of fracture coatings and minerals.

Löfgren M and Sidborn M, 2010. Statistical analysis of results from the quantitative mapping of fracture minerals in Forsmark. Site descriptive modelling – complementary studies. SKB R-09-30, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description:Within the Forsmark site investigation campaign, quantitative mapping of different fracture minerals has been performed. This has been done by studying fracture surfaces of drill core sections from many different boreholes. In this report, the data is statistically analysed both by parametric and non-parametric methods. This is done from the perspective of radionuclide transport modelling and hydrogeochemical modelling. This produces unprecedented quantitative information on the coverage and amounts of fracture coatings and minerals.

SKB, 2010. Comparative analysis of safety related site characteristics. SKB TR-10-54, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: This report is part of the application for a KBS-3 repository at the Forsmark site. It summarises the comparison between the two sites Forsmark and Oskarshamn, where SKB has performed site investigations. The report contains a substantial appendix for qualifying data from the Oskarshamn site, edited by M. Löfgren. This appendix is the equivalent to the SR-Site Data Report (SKB TR-10-52), which is qualifying data for the Forsmark site.

SKB, 2010 (ed. Löfgren M). Data report for the safety assessment SR-Site. SKB . SKB TR-10-52, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description:This report 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. The report forms a part of the documentation of the safety assessment SR-Site, which supports the licence application for a final repository for spent nuclear fuel in Forsmark, Sweden.

Löfgren M, Vecernik P, Havlova V, 2009. Studying the influence of pore water electrical conductivity on the formation factor, as estimated based on electrical methods. SKB R-09-57, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: Report describing experimental work on radionuclide transport properties in granitic rock. The effective diffusivity is investigated with the novel Through-electromigration technique (TEM). Also deals with the questions of surface conduction and anion exclusion.

SKB, 2008. Project SFR 1 SAR-08 Update of priority of FEPs from Project SAFE. SKB R-07-39, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: The report, co-authored by M. Löfgren, describes the features, events, and processes considered in the safety assessment SAR-08, for disposal of low and intermediate level waste in SRF, Sweded. In addition, the FEPs are given updated priorities.

Löfgren M, Crawford J, Elert M, 2007. Tracer tests - possibilities and limitations. Experience from SKB fieldwork: 1977-2007. SKB R-07-39, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: Report inventorying the tracer test carried out by SKB in rock formation during the past 30 years, and drawing conclusions on what information can be extracted from such tracer tests.

Löfgren M, 2007. Formation factor logging in situ by electrical methods in KFM01D and KFM08C. Forsmark site investigation. SKB P-07-138, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: Site investigation report from the Forsmark area in Sweden, describing how in-situ formation factors are obtained by electrical geophysical methods in the bedrock. These formation factors can subsequently be used to obtained effective diffusivities in crystalline rock.

Löfgren M, 2007. Formation factor logging in situ by electrical methods in KLX07A, KLX08, KLX10 and KLX12A. Oskarshamn site investigation. SKB P-06-288, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: Site investigation report from the Laxemar area in Sweden, describing how in-situ formation factors are obtained by electrical geophysical methods in the bedrock. These formation factors can subsequently be used to obtained effective diffusivities in crystalline rock.

Löfgren M, Pettersson M, 2006. Formation factor logging in situ by electrical methods in KLX05 and KLX06. Oskarshamn site investigation. SKB P-06-143, Swedish Nuclear Fuel and Waste Management co. Sweden.

Description: Site investigation report from the Laxemar area in Sweden, describing how in-situ formation factors are obtained by electrical geophysical methods in the bedrock. These formation factors can subsequently be used to obtained effective diffusivities in crystalline rock.

Löfgren M, Neretnieks I, 2006. Through-electromigration: A new method of investigating pore connectivity and obtaining formation factors. Journal of Contaminant Hydrology, Vol. 87(3-4), pp. 237-252.

Abstract: The retardation of radionuclides and other contaminants in fractured crystalline rock is strongly associated with the diffusive properties of the rock matrix. At present, the scientific community is divided concerning the question of long-range pore connectivity in intrusive igneous rock. This paper presents a fast new method, called the through-electromigration method, of obtaining formation factors and investigating pore connectivity. The method involves the migration of an ionic tracer through a rock sample with an electrical potential gradient as the main driving force. The method is analogous to the through-diffusion method but the experimental time is reduced by orders of magnitude. This enables investigations of pore connectivity, as measurements can be made on longer samples. In a preliminary investigation, the new method is compared to the traditional through-diffusion method as well as to rock resistivity methods. The diffusive properties of nine granitic rock samples from Laxemar in Sweden, ranging from 15 to 121 mm in length, have been investigated and the results are compared.

More to be added.

© Niressa, 2015