Konrad

In 1976 investigative efforts commenced at the former iron ore mine Konrad to assess its suitability as a repository for LLW and ILW. The original facility, consisting of two shafts, excavated in 1957 and 1960, respectively, was used to mine iron ore from an iron-rich very low permeable oolitic limestone formation between 1965 and 1976. A total of 6.7 million tonnes of ore were mined during this period.

The geological situation at Konrad offers favourable conditions for the disposal of RAW. The repository horizon is hydraulically isolated from overlying groundwater bearing formations. A more than 400 m thick and regionally widespread series of impervious clay, marl and mudstone layers cover the repository host rock and provide a geological barrier that, in conjunction with geotechnical barriers, will prevent radionuclides escaping into the biosphere (Fig. 14.6). Based on the favourable hydraulic conditions, considerations for repurposing the facility as a RAW repository were already initiated in 1975. In 1982 an application for the commencement of planning approval procedures was submitted.

After an almost 20-year licensing process, the Konrad facility was approved as a final repository in 2002. On 26 March 2007, the licence for Konrad was confirmed by the Federal Administrative Court. The ruling brought to a close all outstanding legal considerations and related judicial processes. Work on conversion of the mine began in May 2007 under the operational management of the BfS. The BfS is the licence holder and formal operator and manager of the facility, while DBE is assigned the responsibility for operating the facility and for the planning and construc­tion of the repository.

The Konrad repository is the first final repository approved in Germany in accordance with the AtG. The facility is approved for the disposal of waste with negligible heat generation and has a licensed capacity for 303,000 m3 of waste. Based on current waste forecasts, it is anticipated that a total of 290,000 m3 of waste will be emplaced in the repository by 2050 (BfS, 2011d).

image186"JHI Up to 400-m-thick layer of different clays as natural geological barrier.

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Подпись: Storage spaces

Подпись: Konrad Shaft 1 Подпись: Konrad Shaft 2

Iron ore horizoi (host rock)

Old working chambers which are not to be used for disposal Model of the deep geological underground in the area of the Konrad repository.

14.6 Three-dimensional representation of the Konrad Repository. Source: Provided by the German Federal Office for Radiation Protection (BfS), Salzgitter, Germany.

A total of 11 storage fields have been approved for the Konrad repository, although it is not anticipated that all of the available volume will be required. These fields will be constructed in the upper 800 m level of the repository. Refitting work is currently scheduled to be completed by 2019 after which waste acceptance operations will begin (BfS, 2011d).

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