Long-term safety analyses for the decommissioning of the ERAM - probabilistic transport model calculations with KAFKA and evaluation of the results Text automatically translated in your browsing language Automatically translated

EMOVGV3T-24-01-AGS

The final repository for radioactive waste Morsleben (ERAM) is located in Saxony-Anhalt near the border with Lower Saxony. Between 1971 and 1991 and from 1994 to 1998, a total of around 37,000 cubic metres of low- and intermediate-level radioactive waste were disposed of. A planning approval procedure is ongoing for the decommissioning of the ERAM. As part of this approval process, a decommissioning concept was developed in order to close the repository in such a way that it does not pose a risk to humans and the environment in the long term. The proposed decommissioning plan envisages to fill the mine with salt concrete to a large extent. Special sealing structures are to be built in the vicinity of the storage areas in the event that relevant quantities of solutions enter the final storage facility, which is not to be expected but still to be taken into account. In addition, the shafts Bartensleben and Marie are to be sealed with seals. The work on the implementation, evaluation and interpretation of convergence announced here will use appropriate parameterizations to carry out the long-term safety analysis and evaluation for the ERAM in accordance with the current state of W&T. The task must be carried out on the basis of the long-term safety analyses carried out so far and the corresponding test results of the approval authority and taking into account the opinion of the ESK of 31 January 2013. For calculations of the material transport of radionuclides in the ERAM, the special software KAFKA was developed in previous projects for the BGE. The modelling software KAFKA (compartment model for propagation and fluid dynamics in a converging underground facility for waste) is a numerical program package for the calculation of flow and transport processes in underground facilities in salt rock for the final disposal of radioactive waste on the basis of a site-specific, current structural model with different compartment types (chambers, stretches, vertical connections and hovering). The version KAFKA 3 is written in the programming language Julia. Corrosive and microbial gas formation is calculated using the GASGEN tool (geochemical gas formation model) written in MATLAB® coupled with PHREEQC. The source terms for radionuclides and other pollutants are available and, as well as convergence and gas formation, have to be prepared via suitable parameterizations as input for the KAFKA modelling. With the EDR (Electronic Data & Results) post-processing tool tailored to the ERAM, it is possible to document, evaluate and visualize the results. The EDR tool is written in JavaScript. All work carried out shall be documented in reports in accordance with the requirements of an approval procedure. Text automatically translated in your browsing language Automatically translated

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https://www.subreport.de/E94479192

Electronic submission: required
https://www.subreport.de/E94479192

The procurement involves the establishment of a framework agreement

08/07/2025 10:00

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