Evaluation of the Localised Corrosion of Carbon Steel Overpacks for Nuclear Waste Disposal in Granite Environments

1985 ◽  
Vol 50 ◽  
Author(s):  
G. P. Marsh ◽  
K. J. Taylor ◽  
I. D. Bland ◽  
C. Westcott ◽  
P. W. Tasker ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Mathematical Modelling ◽  
Nuclear Waste ◽  
Waste Disposal ◽  
Experimental Approach ◽  
Steel Corrosion ◽  
Spent Fuel ◽  
Corrosion Attack ◽  
Metal Thickness

AbstractThe application of carbon steel corrosion allowance containers for the long term encapsulation of HLW or spent fuel requires data on the likely rates of corrosion attack so that the metal thickness needed to prevent penetration can be estimated. This paper describes a joint mathematical modelling and experimental approach to the evaluation of the rate of localised corrosion.

Monitoring deep subsurface microbiota for assessment of safe long-term nuclear waste disposal

1996 ◽  
Vol 42 (4) ◽  
pp. 375-381 ◽  
Author(s):  
David C. White ◽  
David B. Ringelberg
Keyword(s):  
Nuclear Waste ◽  
Waste Disposal ◽  
Nuclear Waste Disposal ◽  
Physiological Status ◽  
Deep Subsurface ◽  
Long Term Storage ◽  
Lipid Biomarker ◽  
Potential Problems

Microbes with their resistance to heat and radioactivity, if present and metabolically active, could have major effects on the safety of nuclear waste disposal by posing potential problems in long-term containment. This paper reviews the applicability of the signature lipid biomarker (SLB) analysis in the quantitative assessment of the viable biomass, community composition, and nutritional/physiological status of the subsurface microbiota as it exists in situ in subsurface samples. The samples described in this review are not unlike those expected to be recovered from proposed deep subsurface disposal sites. Assessment of the microbial community ecology using SLB analysis can be utilized to predict potential problems engendered by microbial metabolic activities of these communities in breaching containment by microbially facilitated corrosion and in the potential for subsequent facilitated transport of nuclides into the environment. SLB analysis of the in situ microbial ecology can be utilized to monitor the feasibility of containment options in modeling tests at the specific disposal sites.Key words: nuclear waste, deep subsurface, microbiota, microbial corrosion, safe long-term storage, signature lipid biomarkers.

scholarly journals Fundamental Research on Radiochemistry of Geological Nuclear Waste Disposal

2020 ◽  
Vol 74 (12) ◽  
pp. 1000-1009
Author(s):  
Sergey V. Churakov ◽  
Wolfgang Hummel ◽  
Maria Marques Fernandes
Keyword(s):  
Nuclear Waste ◽  
Waste Disposal ◽  
Nuclear Power ◽  
Background Concentration ◽  
Chemical Thermodynamics ◽  
Deep Geological Disposal ◽  
Fundamental Research ◽  
Intermediate Storage ◽  
Paul Scherrer

Currently, 5 · 1019 Bq of radioactive waste originating from the use of nuclear power for energy production, and medicine, industry and research, is maintained in Switzerland at intermediate storage facilities. Deep geological disposal of nuclear waste is considered as the most reliable and sustainable long-term solution worldwide. Alike the other European countries, the Swiss waste disposal concept embarks on the combination of engineered and geological barriers. The disposal cell is a complex geochemical system. The radionuclide mobility and consequently radiological impact depend not only on their chemical speciation but also on the background concentration of other stable nuclides and their behaviour in the natural environment. The safety assessment of the repository is thus a complex multidisciplinary problem requiring knowledge in chemical thermodynamics, structural chemistry, fluid dynamics, geo- and radiochemistry. Broad aspects of radionuclide thermodynamics and geochemistry are investigated in state-of-the-art radiochemical laboratories at the Paul Scherrer Institute. The research conducted over the last 30 years has resulted in a fundamental understanding of the radionuclides release, retention and transport mechanism in the repository system.

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