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Vertical Project 6: Disposal in Deep Geological Formations with Arrangements for Monitoring and Retrieval

Project lead

  • Prof. Dr. Joachim Stahlmann, Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Work Package 6.1: Geotechnical Evaluation of the Issues of Retrieval in Geological Disposal of Radioactive Waste

Objective

Analyze and assess deep geological repositories concepts with arrangements for retrieval in different host rocks and depths.

  • Verify technical feasibility of these concepts, even with regards to the necessary standing time and the required lining depending on the given host rock
  • Assess the geotechnical and geomechanical implementation of concepts for the operational and post-operational phases with scenario analysis
  • Assess advantages and disadvantages of each concept
  • International exchange of experiences

WP Lead

  • Univ.-Prof. Dr.-Ing. Joachim Stahlmann, Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Participating Institutes

  • Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Work Package 6.2: Life-Cycle-Engineering Based on Monitoring

Objective

Adapt the life-cycle engineering to the special requirements of repositories based on the monitoring systems to be developed for the different waste management options in different host rocks.

  • adapt the common life-cycle-engineering methods to the conditions underground
  • enhance monitoring-systems based on results of the research projects MonA and MoDeRn, which allow the monitoring of geotechnical constructions for different waste management options in different host rocks

WP Lead

  • Univ.-Prof. Dr.-Ing. Joachim Stahlmann, Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Participating Institutes

  • Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Work Package 6.3: Risk Analysis Assessment of Geotechnical Ground Support Systems

Objective

Evaluate the long-term stability of geotechnical constructions, i.e. sealing, support lining and backfill with probabilistic methods.

  • adapt existing geotechnical concepts to the options with arrangements for waste retrieval
  • analyze the risk and timeframe when ground support linings and sealings will lose their functionality
  • further development of the existing geotechnical concepts

WP Lead

  • Univ.-Prof. Dr.-Ing. Joachim Stahlmann, Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Participating Institutes

  • Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Work Package 6.4: Analyzing the Interaction of Geotechnical Requirements of Life-Cycle-Engineering and Risk-analytic Valuation of Underground Storages with Arrangements for Retrieval

Objective

Developing monitoring programs on the basis of the WP 6.1, WP 6.2 and WP 6.3

WP Lead

  • Univ.-Prof. Dr.-Ing. Joachim Stahlmann, Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Participating Institutes

  • Institute of Foundation Engineering and Soil Mechanics, TU Braunschweig

Work Package 6.5: Interaction between final storage, storage system and waste material to assess long-term stability and retrievability

Objectives

  • Determining the relations between the surroundings of the final storage, the storage container system and the radioactive waste as well as the resulting interactions from a materials science point of view for each waste management option
  • Planning monitoring procedures regarding container integrity and changes in the surrounding conditions for the operational phase and a given timeframe after sealing the final storage in accordance with materials engineering and the characteristics of each waste management option; cross-linking / cooperation with other projects within the same transversal project and with WP 7.2
  • Developing concepts for different scenarios in case of deviations from the expected measured values during monitoring
  • Establishing an optimal basis supporting the decision-making process for a final storage site

WP management

  • Dr.-Ing. T. Hassel, Institute of Materials Science, Leibniz Universität Hannover

Participating institutes

  • Institute of Materials Science, Leibniz Universität Hannover

Work Package 6.6: Intervening-techniques for safe retrievability

Objective

Adding a safely realizable state-of-the art concept for retrieval to the final storage planning which allows the safe removal of the waste containers from the final depository.

  • Identification and evaluation of existing techniques for container handling and retrieval
  • Determining the constraints of each waste management option
  • Deducing requirements to the depository and the container systems which have to be fulfilled to ensure save retrieval
  • Creating a decision matrix for the choice of suitable handling and retrieval techniques
  • Developing retrieval strategies / retrieval techniques for the different final storage concepts based on constructive and materials science aspects

WP management

  • Dr.-Ing. T. Hassel, Institute of Materials Science, Leibniz Universität Hannover

Participating institutes

  • Institute of Materials Science, Leibniz Universität Hannover

Work Package 6.7: In situ Data Collection and Demonstration during the Monitoring Phase of a deep geological Repository (starting in month 37)

Objective

Developing a concept for the in situ data collection and demonstration of safety-relevant phenomena during the monitoring phase of a deep geological repository

  • Assembling safety relevant characteristics and processes which seem to be useful and achievable for measurements and observation during long-term monitoring of a deep geological repository; basis: WP 6.1 and 6.3
  • Alignment with transversal project 4 „Interdisciplinary risk-research“
  • Concept with opportunities of action during monitoring phase (e.g.: installing a stable shaft, building a shaft seal and measuring its hydraulic and mechanical characteristics; corresponding instrumentation)

WP Management

  • Prof. Dr. Karl-Heinz Lux, Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics, Clausthal University of Technology

Participating Institutes

  • Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics, Clausthal University of Technology
  • Institute of Disposal Research, Clausthal University of Technology