EURAD - D2.12 HLW Characterisation of glass/steel/buffer interaction experiments
The main objective of the ACED work package (Assessment of Chemical Evolution of ILW and HLW Disposal Cells) in EURAD is to improve methodologies to obtain multi-scale quantitative models for the description of the chemical evolution at the disposal cell scale and to derive robust mathematical models including the most relevant processes.
For the interface and waste package scale, existing data on materials and material interfaces are combined with data from running experiments at the beginning of the project and dismantled during the course of the project as well as few complementary new experimental set-ups for evaluating the process integration methodology. While the interface scale investigations concentrate on steel-cement and steel-clay interfaces, long-term concrete degradation and implications of waste degradation are the focus at the waste package scale.
The subtask 3.1 concerns the first upscaling step from the relatively isolated processes at interfaces to repository sub-systems, representative for high-level radioactive waste (HLW) packages, where chemical and physical processes might be closely intertwined.
In case of HLW and according to existing HLW disposal concepts in Europe, the subtask 3.1 concentrates on the study of three experimental systems: « Glass/steel/clay » to « Glass/steel/cement » with an intermediate case « Glass/steel/cement buffer/clay »
These systems allow to study the different interfaces expected in HLW disposal cells with vitrified waste, metallic components, presence of cementitious material and near-field host rock.
This deliverable gives a detailed overview of information available about the following experiments:
Glass/Steel/Clay experiment performed by CEA and running for 6.1 years at 50°C (chapter 2),
Glass/Steel/Clay batch experiment performed by MTA and running for 1 year at 80°C (chapter 3),
Glass/Steel/Cement-bentonite/Clay experiment at 70°C by EDF and launched in April 2018 (chapter 4),
Glass/Steel/Cement experiment carried out by SCK-CEN on 20-25°C between 2009 and 2013 (chapter 5).
The different modelling approach began with the experimental data already available at the beginning of ACED. Here more data are provided that will be used in subtask 3.2 and Task 4 for the modelling effort.