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Site description of Forsmark at completion of the site investigation phase. SDM-Site Forsmark

Abstract

The Swedish Nuclear Fuel and Waste Management Co., SKB, has undertaken site characterisation in two different areas, Forsmark and Laxemar-Simpevarp, in order to identify a suitable location for a geological repository of spent nuclear fuel according to the KBS-3 method. The site investigations have been conducted in campaigns, punctuated by data freezes. After each data freeze, the site data have been analysed and modelling has been carried out with the overall purpose to develop a site descriptive model (SDM). The site descriptive model is used by repository engineering to design the underground facility and to develop a repository layout adapted to the site. It is also essential for safety assessment, since the model is the only source for site-specific input. Another important use of the site descriptive model is in the environmental impact assessment. An SDM is an integrated model for geology, thermal properties, rock mechanics, hydrogeology, hydrogeochemistry, bedrock transport properties and a description of the surface system. The site descriptive model compiled in the current report, SDM-Site, presents an integrated understanding of the Forsmark area at the completion of the surface-based investigations, which were conducted at Forsmark during the period 2002 to 2007. It also provides a summary of  More>>
Authors:
Publication Date:
Dec 15, 2008
Product Type:
Technical Report
Report Number:
SKB-TR-08-05
Resource Relation:
Other Information: 350 refs., figs., tabs.
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; RADIOACTIVE WASTE DISPOSAL; UNDERGROUND DISPOSAL; GEOLOGIC MODELS; SITE CHARACTERIZATION; HYDROLOGY; ROCK MECHANICS; HYDRAULIC CONDUCTIVITY; SAFETY ANALYSIS; GEOCHEMISTRY; GROUND WATER; GEOLOGIC FRACTURES
OSTI ID:
951451
Research Organizations:
Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ISSN 1404-0344; TRN: SE0908119
Availability:
Also available from: http://www.skb.se/upload/publications/pdf/TR-08-05webb.pdf; OSTI as DE00951451
Submitting Site:
SWDN
Size:
537 pages
Announcement Date:
Apr 24, 2009

Citation Formats

Not Available. Site description of Forsmark at completion of the site investigation phase. SDM-Site Forsmark. Sweden: N. p., 2008. Web.
Not Available. Site description of Forsmark at completion of the site investigation phase. SDM-Site Forsmark. Sweden.
Not Available. 2008. "Site description of Forsmark at completion of the site investigation phase. SDM-Site Forsmark." Sweden.
@misc{etde_951451,
title = {Site description of Forsmark at completion of the site investigation phase. SDM-Site Forsmark}
author = {Not Available}
abstractNote = {The Swedish Nuclear Fuel and Waste Management Co., SKB, has undertaken site characterisation in two different areas, Forsmark and Laxemar-Simpevarp, in order to identify a suitable location for a geological repository of spent nuclear fuel according to the KBS-3 method. The site investigations have been conducted in campaigns, punctuated by data freezes. After each data freeze, the site data have been analysed and modelling has been carried out with the overall purpose to develop a site descriptive model (SDM). The site descriptive model is used by repository engineering to design the underground facility and to develop a repository layout adapted to the site. It is also essential for safety assessment, since the model is the only source for site-specific input. Another important use of the site descriptive model is in the environmental impact assessment. An SDM is an integrated model for geology, thermal properties, rock mechanics, hydrogeology, hydrogeochemistry, bedrock transport properties and a description of the surface system. The site descriptive model compiled in the current report, SDM-Site, presents an integrated understanding of the Forsmark area at the completion of the surface-based investigations, which were conducted at Forsmark during the period 2002 to 2007. It also provides a summary of the abundant underlying data and the discipline-specific models that support the site understanding. The description relies heavily on background reports that address, in particular, details in data analyses and modelling in the different disciplines. The Forsmark area is located in northern Uppland within the municipality of Oesthammar, about 120 km north of Stockholm. The candidate area for site investigation is located along the shoreline of Oeregrundsgrepen, within the north-western part of a major tectonic lens that formed between 1.87 and 1.85 billion years ago during the Svecokarelian orogeny. The candidate area is approximately 6 km long and 2 km wide. The north-western part of the candidate area lacks hydraulically conductive, gently dipping fracture zones at potential repository depth and was selected as the target area for the complete site investigation work, following the initial investigations at the site. Prior to the presentation of the SDM-Site report, three versions of a site descriptive model have been completed for the Forsmark area and presented for peer review. The last version, referred to as version 1.2, was a preliminary site description that concluded the initial site investigation work and was presented in 2005. This preliminary site description formed the basis for a preliminary safety evaluation (PSE) of the Forsmark area, a preliminary repository layout (step D1), and the first evaluation of the long-term safety of this layout for KBS-3 repositories in the context of the SR-Can project. The final site descriptive model, SDM-Site, builds on a coordinated geological model in 3D, into which other discipline-specific models have been integrated without any major conflicting interpretations. In particular, the thermal properties of the bedrock at the site have been coupled to identified rock domains in the geological model and an integrated model that links the current stress regime, the hydrogeology and the chemistry of the groundwater to fracture domains and fracture zones in the geological model has evolved. These mutually consistent results demonstrate that a fundamental understanding of the current state of conditions and the on-going processes in the Forsmark area, from the surface down to potential repository depth, has been achieved. In addition, the properties of the area can be explained in the context of an understanding of the past evolution, throughout a long period of geological history. This integrated understanding of the area is presented in chapter 11 of this report and this chapter serves as an executive summary. A systematic assessment of the confidence in the model, including treatment of uncertainties and evaluation of alternative interpretations, has been carried out. This assessment has taken account of the feedback obtained from the work with the preliminary repository layout step D1 and from the safety assessment SR-Can, as well as the feedback obtained on earlier versions of the site description. The overall outcome of this assessment is that most properties of importance for both repository constructability and long-term safety are bounded sufficiently, and that data from underground now bears the prime potential to further reduce uncertainties in the target volume. However, complementary studies to reduce some of these uncertainties are also currently in progress. Uncertainties outside the target volume are larger, but are judged to be of less importance for the constructability and long-term safety of a repository}
place = {Sweden}
year = {2008}
month = {Dec}
}