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Abstract

Sub-surface disposal systems are expected to contain a large amount of carbon steel as containers for radioactive waste or rebar of concrete pits. Corrosion expansion of the steel can cause cracking or expansion of cementitious materials and deteriorate the performance of low diffusivity of the systems. This study evaluated available literature with regard to the corrosion rate and corrosion expansion of the steel, with the aim of determining the most likely parameter values that are requested for performing safety assessment of the likely scenario by the former Japanese regulatory body. Furthermore, polarisation, electrolytic corrosion, and hydraulic tests considering the disposal conditions were conducted to verify the validity of some of the values.

Keywords

Carbon steel Sub-surface disposal Corrosion rate Corrosion expansion

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Corrosion properties of carbon steel for performance assessment of sub-surface disposal systems

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