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Preliminary site description. Simpevarp area - version 1.1

Abstract

Site characterisation in the Oskarshamn area is currently conducted at two adjoining localities, the Simpevarp and Laxemar subareas. This report presents the interim version (model version Simpevarp 1.1 of S1.1 for short) of the preliminary Site Descriptive Model for the Simpevarp subarea. The basis for this interim version is quality-assured, geoscientific and ecological field data from the Simpevarp subarea (and in part from the Laxemar area) available in the SKB SICADA and GIS data bases as of July 1, 2003 as well as version 0 of the Site Descriptive Model. The new data collected during the initial site investigation phase up till the date of data freeze S1.1 constitute the basis for the update of version 0 to version S1.1. These data include results from surface investigations in the subarea with its regional environment and from drillings and investigations in boreholes. The surface-based data sets were, in a relative sense, extensive compared with data sets from boreholes, were the information largely was limited to information from one c. 1,000 m deep cored borehole (KSH01A), two existing cored boreholes and three c. 200 m deep percussion-drilled boreholes. Discipline-specific models are developed for the selected regional and local model volumes and these  More>>
Authors:
Winberg, Anders [1] 
  1. ed.
Publication Date:
Aug 01, 2004
Product Type:
Technical Report
Report Number:
SKB-R-04-25
Resource Relation:
Other Information: 300 refs., figs., tabs; PBD: Aug 2004
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; GEOCHEMISTRY; GEOLOGIC MODELS; GEOLOGIC STRUCTURES; GROUND WATER; RADIOACTIVE WASTE DISPOSAL; SITE CHARACTERIZATION; SWEDEN; UNDERGROUND DISPOSAL
OSTI ID:
20543078
Research Organizations:
Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ISSN 1402-3091; TRN: SE0400482107008
Availability:
Available from INIS in electronic form; Also available from: http://www.skb.se/upload/publications/pdf/R-04-25Chapter1-3.pdf and http://www.skb.se/upload/publications/pdf/R-04-25Chapter4-8.pdf and http://www.skb.se/upload/publications/pdf/R-04-25App1-5.pdf (Three files)
Submitting Site:
SWDN
Size:
461 pages
Announcement Date:

Citation Formats

Winberg, Anders. Preliminary site description. Simpevarp area - version 1.1. Sweden: N. p., 2004. Web.
Winberg, Anders. Preliminary site description. Simpevarp area - version 1.1. Sweden.
Winberg, Anders. 2004. "Preliminary site description. Simpevarp area - version 1.1." Sweden.
@misc{etde_20543078,
title = {Preliminary site description. Simpevarp area - version 1.1}
author = {Winberg, Anders}
abstractNote = {Site characterisation in the Oskarshamn area is currently conducted at two adjoining localities, the Simpevarp and Laxemar subareas. This report presents the interim version (model version Simpevarp 1.1 of S1.1 for short) of the preliminary Site Descriptive Model for the Simpevarp subarea. The basis for this interim version is quality-assured, geoscientific and ecological field data from the Simpevarp subarea (and in part from the Laxemar area) available in the SKB SICADA and GIS data bases as of July 1, 2003 as well as version 0 of the Site Descriptive Model. The new data collected during the initial site investigation phase up till the date of data freeze S1.1 constitute the basis for the update of version 0 to version S1.1. These data include results from surface investigations in the subarea with its regional environment and from drillings and investigations in boreholes. The surface-based data sets were, in a relative sense, extensive compared with data sets from boreholes, were the information largely was limited to information from one c. 1,000 m deep cored borehole (KSH01A), two existing cored boreholes and three c. 200 m deep percussion-drilled boreholes. Discipline-specific models are developed for the selected regional and local model volumes and these models are subsequently integrated into a unified site description. The current methodologies for developing discipline-specific models and their integration are documented in methodology/ strategy reports. In the present work, the procedures and guidelines given in those reports were followed to the extent possible given the data and information available at the time of data freeze for model version S1.1. Compared with version 0 there are considerable additional features in the version S1.1, especially in the geological description and in the description of the near surface. The geological models of lithology and deformation zones are based on borehole information and surface data of much higher resolution. The lithology model includes four interpreted rock domains. The deformation zone model includes 14 zones of interpreted high confidence (of existence). A discrete fracture network model has also been developed where attempts are made to assess effects on fracturing imposed by interpreted deformation zones. Furthermore, the validity of extrapolating surface fracture statistics to larger depths was explored. The rock mechanics strength model is based on information from the Aespoe Hard Rock Laboratory and an empirical, mechanical classification of data from KSH01A and at outcrops. A first model of thermal properties of the rock has been developed largely based on data from Aespoe Hard Rock Laboratory, and projections based on density and mineral content. Overall the rock at Simpevarp is characterised by a low thermal conductivity. A consequence of the planned delay in parts of the geological model is that the hydrogeological description is based solely on the version 0 regional structural model. The regional flow pattern is found to be governed by the geometry of the interpreted deformation zones in relation to the acting hydraulic gradient. Hydrogeological simulations of the groundwater evolution since the last glaciation were compared with the developed hydrogeochemical conceptual model. The conceptual model of the development of post-glacial hydrogeochemistry was updated. Also, the salinity distribution, mixing processes and the major reactions altering the groundwater composition were described down to a depth of 300 m. A first model of the transport properties of the rock was presented, although still rather immature due to lack of site-specific data in support of the model. For the near-surface, the Simpevarp subarea is characterised by a large portion of outcrop rock. There is information regarding the distribution of Quaternary deposits, and some information about the stratigraphy of the till, the latter found to be of small thickness, generally 1-3 m. There is much uncertainty in the version 1.1 of the Simpevarp site descriptive model, but the main uncertainties have been identified, some have been quantified and others have been left as input to alternative hypotheses. However, since a main reason for uncertainty in S1.1 is lack of data and poor data density, and as much more data are expected in future data freezes, it was not judged meaningful to carry the uncertainty quantification or the alternative model generation too far. Advances were made on some of the important site specific questions that were formulated in planning the execution programme for the Simpevarp area. With regards to size and locations of rock volumes with suitable properties possible volume-delineating deformation zones have been interpreted, although with uncertainty and only limited new information is available on material properties of the rock mass at depth. [abstract truncated]}
place = {Sweden}
year = {2004}
month = {Aug}
}