// Closure of Underground Cavities, Long-term Safety Studies

KOMPASS-II

Compaction of salt gravel for secure confinement - Phase 2

Long-term effective sealing elements are essential in the safety concept for a potential repository for heat-generating, high-level radioactive waste in the host rock salt. The sealing elements are part of a closure system for drifts and shafts and are constructed based on qualified emplaced salt gravel. The function of salt gravel as a geotechnical barrier represents a paradigm shift in the safety function of salt gravel, documented in the Site Selection Act of 2017. In the past, salt gravel was primarily considered for its suitability as backfill material with support function for the surrounding host rock. For the intended use of salt gravel as a geotechnical barrier, the proof of long-term functionality is essential. The KOMPASS-II project, as a follow-up project to the KOMPASS-I project, deals with the investigation of the compaction behavior of salt gravel with the aim of improving the understanding of the thermohydraulic-mechanical (THM) coupled processes and thus strengthening the scientific basis for the use of salt gravel for the long-term isolation of heat-generating, high-level radioactive waste in rock salt. For this purpose, experimental studies based on long-term compaction experiments with microstructural investigations, as well as numerical modeling, are combined. An adequate description of the compaction process, as well as the influencing parameters, is sought, as well as a robust and reliable prognosis with validated material models for long-term safety.

Contact

Research & Development
info@bge-technology.de

Short Infos

Runtime: 2021 - 2023

Client:
Bundesministerium für Umwelt, Naturschutz, nukleare Sicherheit und Verbraucherschutz (BMUV) vertreten durch das Karlsruher Institut für Technologie, beauftragter Projektträger Karlsruhe PTKA

Funding Code:
02E11951B

Partner:
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Deutschland
Gesellschaft für Anlagen- und Reaktorsicherheit gGmbH (GRS), Deutschland
Institut für Gebirgsmechanik GmbH (IfG Leipzig), Deutschland
SANDIA National Laboratories (SANDIA), Vereinigte Staaten von Amerika
Technische Universität Clausthal (TU Clausthal), Deutschland

Publications

// Research report

Compaction of Crushed Salt for Safe Containment – Phase 2

Author(s): L. Friedenberg, C. Lerch, N. Müller-Hoeppe, M. Rahmig, et al.

Final report of the KOMPASS-II research project

Language: Englisch

Publication number: GRS - 751

15.01.2024

Friedenberg, L.; Lerch, C.; Müller-Hoeppe, N.; Rahmig, M.; et al. (2024): Compaction of Crushed Salt for Safe Containment – Phase 2. Final report of the KOMPASS-II research project. KOMPASS-II: Compaction of salt gravel for secure confinement - Phase 2. GRS - 751. Gesellschaft für Anlagen- und Reaktorsicherheit gGmbH (GRS), BGE TECHNOLOGY GmbH (BGE TEC), Bundesanstalt für Geowissenschaften und Rohstoffe (BGR). Braunschweig

KOMPASS-II

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// Vortrag

Role of crushed salt in the repository concept

Author(s): N. Müller-Hoeppe, C. Lerch

11th US-German Workshop on Salt Repository Research, Design, and Operation

Language: Englisch

12.05.2020

Müller-Hoeppe, N.; Lerch, C. (2020): Role of crushed salt in the repository concept. 11th US-German Workshop on Salt Repository Research, Design, and Operation. KOMPASS-II: Compaction of salt gravel for secure confinement - Phase 2. BGE TECHNOLOGY GmbH (BGE TEC). Online

KOMPASS-II

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