Abstract
The workshop was convened to inform and advise SSM about the coupled processes of buffer erosion and enhanced canister corrosion that have been proposed as a potentially detrimental scenario in the long-term evolution of the engineered barrier system of a deep geological repository. It was an extension of the deliberations of SSM's BRITE advisory group on EBS issues and on SKB's approaches to the issues in the forthcoming SR-Site safety case. The workshop was planned to assist and advise SSM in its preparations for review of SKB.s license application and SR-Site submission. The potential for buffer erosion due to a future influx of dilute groundwater that induces bentonite to behave as a sol has been indicated by experiments carried out for SKB. It is generally considered that the most likely source and timing of such groundwater conditions will be the glacial stage of the normal evolution of the repository system, i.e. many tens of thousands of years into the future at least. The workshop considered, however, that potential causes of buffer erosion in the early post-closure period should also be considered. The main significance of buffer erosion for a safety case is that it would potentially lead to higher rates
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Citation Formats
Robinson, Peter, and Bath, Adrian.
Workshop on Copper Corrosion and Buffer Erosion. Stockholm 15-17 September 2010.
Sweden: N. p.,
2011.
Web.
Robinson, Peter, & Bath, Adrian.
Workshop on Copper Corrosion and Buffer Erosion. Stockholm 15-17 September 2010.
Sweden.
Robinson, Peter, and Bath, Adrian.
2011.
"Workshop on Copper Corrosion and Buffer Erosion. Stockholm 15-17 September 2010."
Sweden.
@misc{etde_1013170,
title = {Workshop on Copper Corrosion and Buffer Erosion. Stockholm 15-17 September 2010}
author = {Robinson, Peter, and Bath, Adrian}
abstractNote = {The workshop was convened to inform and advise SSM about the coupled processes of buffer erosion and enhanced canister corrosion that have been proposed as a potentially detrimental scenario in the long-term evolution of the engineered barrier system of a deep geological repository. It was an extension of the deliberations of SSM's BRITE advisory group on EBS issues and on SKB's approaches to the issues in the forthcoming SR-Site safety case. The workshop was planned to assist and advise SSM in its preparations for review of SKB.s license application and SR-Site submission. The potential for buffer erosion due to a future influx of dilute groundwater that induces bentonite to behave as a sol has been indicated by experiments carried out for SKB. It is generally considered that the most likely source and timing of such groundwater conditions will be the glacial stage of the normal evolution of the repository system, i.e. many tens of thousands of years into the future at least. The workshop considered, however, that potential causes of buffer erosion in the early post-closure period should also be considered. The main significance of buffer erosion for a safety case is that it would potentially lead to higher rates of corrosion of the copper canister. There are various physicochemical mechanisms that could be implicated in enhanced corrosion but basically they would involve (a) the failure of a diffusion controlled constraint on corrodant transport to and product transport away from the copper surface, and (b) the viability of microbially-mediated reactions producing higher concentrations of corrodants at or near to the copper surface. The general issues relating to corrosion had already been the theme for a previous workshop in 2005 (see Report SKI 2006:11), the outcomes of which formed the background for this workshop. Additional background was provided by SKB's interim safety case, SR-Can, and the regulatory authorities. responses to preliminary consideration of the buffer erosion and related corrosion scenario. Because of its potential significance and recent prominence and with the insights already provided by the BRITE group's review of the scientific case and experimental evidence, the hypothesis that copper is subject to corrosion reaction with pure water under anoxic conditions was included in the scope of the workshop. The workshop identified a broad number of potential issues and the information required to address the issues, considered their relative significance to EBS performance and to a safety case, and also examined where there might be specific couplings and interdependence between processes that also need to be addressed}
place = {Sweden}
year = {2011}
month = {Feb}
}
title = {Workshop on Copper Corrosion and Buffer Erosion. Stockholm 15-17 September 2010}
author = {Robinson, Peter, and Bath, Adrian}
abstractNote = {The workshop was convened to inform and advise SSM about the coupled processes of buffer erosion and enhanced canister corrosion that have been proposed as a potentially detrimental scenario in the long-term evolution of the engineered barrier system of a deep geological repository. It was an extension of the deliberations of SSM's BRITE advisory group on EBS issues and on SKB's approaches to the issues in the forthcoming SR-Site safety case. The workshop was planned to assist and advise SSM in its preparations for review of SKB.s license application and SR-Site submission. The potential for buffer erosion due to a future influx of dilute groundwater that induces bentonite to behave as a sol has been indicated by experiments carried out for SKB. It is generally considered that the most likely source and timing of such groundwater conditions will be the glacial stage of the normal evolution of the repository system, i.e. many tens of thousands of years into the future at least. The workshop considered, however, that potential causes of buffer erosion in the early post-closure period should also be considered. The main significance of buffer erosion for a safety case is that it would potentially lead to higher rates of corrosion of the copper canister. There are various physicochemical mechanisms that could be implicated in enhanced corrosion but basically they would involve (a) the failure of a diffusion controlled constraint on corrodant transport to and product transport away from the copper surface, and (b) the viability of microbially-mediated reactions producing higher concentrations of corrodants at or near to the copper surface. The general issues relating to corrosion had already been the theme for a previous workshop in 2005 (see Report SKI 2006:11), the outcomes of which formed the background for this workshop. Additional background was provided by SKB's interim safety case, SR-Can, and the regulatory authorities. responses to preliminary consideration of the buffer erosion and related corrosion scenario. Because of its potential significance and recent prominence and with the insights already provided by the BRITE group's review of the scientific case and experimental evidence, the hypothesis that copper is subject to corrosion reaction with pure water under anoxic conditions was included in the scope of the workshop. The workshop identified a broad number of potential issues and the information required to address the issues, considered their relative significance to EBS performance and to a safety case, and also examined where there might be specific couplings and interdependence between processes that also need to be addressed}
place = {Sweden}
year = {2011}
month = {Feb}
}