The geological siting area covers an area of around 50 square kilometres. The preferred host rock is the Opalinus Clay (with its confining units).
Understanding of the spatial conditions in the area is based on 2D and 3D seismic investigations and results from a deep borehole (Benken). The siting area is located in the Tabular Jura at the northern boundary of the Molasse Basin and is tectonically quiet. The host rock is in a stable setting, with a slight dip to the south-east. This allows considerable flexibility in terms of the layout of the disposal caverns and tunnels.
Overall, the siting area is evaluated as being very suitable.
The underground installations of a deep geological repository for high-level waste in Opalinus Clay could be constructed in the area shown in orange.
Canton Zürich: Benken, Dachsen, Flaach, Flurlingen, Kleinandelfingen, Laufen-Uhwiesen, Marthalen, Ossingen, Rheinau, Trüllikon, Truttikon
Canton Thurgau: Schlatt
Planning perimeter for surface facilities
The required surface infrastructure (e.g. the portal of the access tunnel) could also be located outside this siting region. Working together with the affected Cantons and representatives from Germany, the Federal Government has defined planning zones (so-called planning perimeters) that include these additional areas. The planning perimeter extends up to 5 km around the geological siting region and should have good road or rail access. Mountainous and hilly zones and protected natural areas are restricting factors. The Federal Office of Energy announced the planning perimeters in provisional form on 10th December 2009; these were approved by the Federal Council on 30th November 2011.
Additional communities within the planning perimeter (besides the siting communities):
Canton Zürich: Adlikon, Andelfingen, Dägerlen, Dorf, Feuerthalen, Henggart, Humlikon, Thalheim an der Thur
Canton Schaffhausen: Beringen, Gutmadingen, Löhningen, Neuhausen am Rheinfall, Neunkirch, Schaffhausen
Canton Thurgau: Basadingen-Schlattingen, Diessenhofen
The area is located in the community of Rheinau and partly in Marthalen, in an agricultural zone. Some construction measures would be necessary to provide access. Apart from a railway line and several minor roads, the area is not overdeveloped in terms of infrastructure. Because of the forest to the south-east, the facility would be visible only from the north-west from more distant localities.
The area lies in the community of Marthalen close to the railway station and an industrial zone and is used today for agriculture. Accessing it from the existing transport network would be straightforward. The facility would be visible from residential zones and would have an impact on the present overall appearance of the locality.
The area is located in the community of Schlatt adjacent to an existing industrial zone and is generally used today for agriculture. Access would be relatively straightforward. The existing industrial buildings mean that the facility would not be visible from the nearest residential zones in the village of “Neu Paradies”, but would be visible from the south and east.
Geological profile from north-west to south-east through Zürich Nordost. The grey arrow marks the Opalinus Clay.
Tel. +41 (0)56 437 12 73
|At a media conference held by the Swiss Federal Office of Energy (SFOE), Nagra announces its proposals for potential siting areas for the surface facility. These will serve as the basis for discussions within the framework of regional participation.|
|The Federal Council decides to include the siting region Zürich Nordost in the further Sectoral Plan process. Stage 1 of the process is completed and Stage 2 initiated.|
|Start of the public consultation phase on Stage 1 of the site selection process for deep geological repositories. |
|The Swiss Federal Nuclear Safety Inspectorate (ENSI) approves Nagra's proposed siting regions following a review of safety and engineering feasibility aspects.|
|Announcement of the provisional planning perimeter by the Swiss Federal Office of Energy (SFOE).|
|Marthalen. Together with the ENSI and Nagra, the SFOE provides information on the proposals for geological siting regions. |
Announcement by the SFOE of the proposed siting regions for deep geological repositories.
The Federal Council approves the conceptual part of the sectoral plan for deep geological repositories.
The Federal Council approves the „Entsorgungsnachweis" project, but rejects the request for identification of a site as being premature.
Submission of a report setting out the options, in terms of potential host rocks and siting regions, for disposal of high-level waste (NTB 05-02, in German).
Submission of the „Entsorgungsnachweis" feasibility study for high-level waste to the Federal Council. The project is based on the example of the Opalinus Clay in the Zürcher Weinland.
Publication of the investigation reports for the Benken borehole (NTB 00-01) and the 3D seismic campaign (NTB 00-03).
1998 – 1999
Extensive 3D seismic measurement campaign.
The Federal Council grants a permit for the Benken borehole.
1991 – 1992
Regional seismic investigations between the river Aare and Lake Constance (2D seismics).
1982 – 1984
Regional seismic investigations in the area Olten - Schaffhausen.