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Geosciences 2017, 7(3), 58; doi:10.3390/geosciences7030058

About the Possibility of Disposal of HLRW in Deep Boreholes in Germany

1
Final Disposal Department, GRS gGmbH, Schwertnergasse 1, 50667 Cologne, Germany
2
RWTH Aachen, Nukleare Entsorgung und Techniktransfer (NET), D-52062 Aachen, Germany
3
Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
4
KIT Karlsruher Institute of Technology-Technical University Karlsruhe, Institute of Applied Geosciences, Adenauerring 20b, 76131 Karlsruhe, Germany
5
Piewak & Partner, Jean-Paul-Str. 30, 95444 Bayreuth, Germany
*
Author to whom correspondence should be addressed.
Received: 28 April 2017 / Revised: 7 June 2017 / Accepted: 10 July 2017 / Published: 18 July 2017
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Abstract

Using deep boreholes for the final disposal of high-level radioactive waste (HLRW) can take advantage of multiple geologic barriers as safety features and aims for the safe containment of radionuclides by containment-providing rock zones (CPRZ). The great depth efficiently prolongs or hinders radionuclide transport and also impedes proliferation. Finally, there may be a time benefit with regard to technical implementation and costs. Due to the phase-out from nuclear energy in Germany the number of boreholes could be less than 100. A simplified, generic safety concept, and the requirements for the diameter of boreholes and containers are derived in this paper. Furthermore, the operational safety of emplacement, the retrieval of waste and sealing of the boreholes is discussed. It is outlined that boreholes can be sealed quickly and over long distances with proven technologies, for example, using the creep properties of salt rock formations. This concept is assessed for its compliance with the safety requirements of the German Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB), and the requirements and criteria for site selection defined by the German commission on “Storage of high-level radioactive waste”. The retrievability of HLRW is assessed to be technically feasible based on today´s knowledge, but recoverability after closure cannot be guaranteed for long time spans. Further developments in details of the concept of deep borehole disposal (DBD), a demonstration of its technical feasibility and an assessment of operational and long-term safety are still necessary to make DBD an approved option. View Full-Text
Keywords: high-level radioactive waste; deep boreholes; final disposal; safety analysis high-level radioactive waste; deep boreholes; final disposal; safety analysis
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Bracke, G.; Charlier, F.; Liebscher, A.; Schilling, F.R.; Röckel, T. About the Possibility of Disposal of HLRW in Deep Boreholes in Germany. Geosciences 2017, 7, 58.

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