Abstract
In the dry cask storage of spent nuclear fuels, a stainless-steel canister acts as an important barrier for encapsulating spent fuels. As a result, local corrosion behavior of 304L stainless steel has become an issue of concern in the wet coastal region and salt spray environment. The test was conducted after deposition of simulated sea salt particles on the 304L stainless-steel specimen. It was first covered with a crevice former, and then kept at 45 °C with a relative humidity of 45%, 55%, and 70%, respectively. The surface morphologies and electron back scatter diffraction (EBSD) analysis of the corroded region for the 304L stainless-steel specimen are presented in this paper. The goal of this work was to investigate the crevice corrosion behavior of 304L stainless steel under different chloride concentrations and relative humidity conditions. From the experimental results, a threshold relative humidity for stress corrosion cracking (SCC) initiation of 304L stainless steel was proposed.
Highlights
Stainless steels are widely used as structural materials for nuclear power plants because of their excellent general corrosion resistance and mechanical properties
Obvious crevice corrosion was observed in the corroded region
Rusts on the specimen correspond to crevice corrosion induced by chloride
Summary
Stainless steels are widely used as structural materials for nuclear power plants because of their excellent general corrosion resistance and mechanical properties. In the dry storage of spent nuclear fuels, a stainless-steel canister acts as an important barrier for encapsulating spent fuels. The decay heat of spent nuclear fuels dissipates through the canister surface by air cooling. The canister surface is in contact with air, which contains sea salt particles. It is contaminated by chlorides because the interim storage facilities for spent nuclear fuels were built in coastal regions in Taiwan. Atmospheric localized corrosion can take place on these canisters when there is aerosol deposition of salt particles on the metal surface [1]
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