The electrochemistry in 316SS crevices exposed to PWR-relevant conditions
Source abstract
Abstract
Abstract The chemical and electrochemical conditions within a crevice of Type 316 stainless steel in boric acid–lithium hydroxide solutions under PWR-relevant conditions were modelled with a computational electrochemistry code. The influence of various variables: dissolved hydrogen, boric acid, lithium hydroxide concentration, crevice length, and radiation dose rate was studied. It was found with the model that 25 ccH 2 /kg (STP) was sufficient to remain below an electrode potential of -230 mV she , commonly accepted sufficient to prevent stress corrosion cracking under BWR conditions. In a PWR plant various operational B–Li cycles are possible but it was found that the choice of the cycle did not significantly influence the model results. It was also found that a hydrogen level of 50 ccH 2 /kg (STP) would be needed to avoid substantial lowering of the pH inside a crevice.
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Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Nuclear Materials and Properties · Nuclear Engineering Thermal-Hydraulics
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References (19)
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