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51318-11456-Pitting Corrosion Inhibition of Carbon Steel in Simulated Liquid Radioactive Waste at Elevated Hydroxide Concentrations

Pitting Corrosion Inhibition of Carbon Steel in Simulated Liquid Radioactive Waste at Elevated Hydroxide Concentrations Hydroxide Concentrations
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Electrochemical testing was utilized determine the borderline conditions for pitting to optimize the chemistry control program for underground double shell tanks containing liquid radioactive waste.

Product Number: 51318-11456-SG
Author: R. E. Fuentes / B. J. Wiersma / K. D. Boomer / A. J. Kim
Publication Date: 2018
Industry: Energy Generation
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$20.00
$20.00

Liquid radioactive waste is stored in underground double shell tanks (DSTs) constructed carbon steel at the Hanford site. A comprehensive chemistry control program to prevent stress corrosion cracking (SCC) and other types of localized corrosion exists. The program mostly relies on the addition of sodium hydroxide to raise the pH of the waste and radiolysis to form nitrite for inhibition. It is desirable to define the borderline conditions of the current chemistry control program to be aware and prevent conditions conducive to pitting corrosion. These conditions may occur due to anticipated future waste streams that can change the chemistry of the waste in these tanks. The current corrosion control program primarily inhibits against localized corrosion due to nitrate. Electrochemical testing was utilized determine the borderline conditions for pitting to optimize the chemistry control program for DSTs. A statistically designed set of borderline conditions at high hydroxide concentration with different aggressive species (e.g., chloride, sulfate) in addition to nitrate was tested.

Key words: radioactive waste, carbon steel, pitting corrosion, electrochemical testing

Liquid radioactive waste is stored in underground double shell tanks (DSTs) constructed carbon steel at the Hanford site. A comprehensive chemistry control program to prevent stress corrosion cracking (SCC) and other types of localized corrosion exists. The program mostly relies on the addition of sodium hydroxide to raise the pH of the waste and radiolysis to form nitrite for inhibition. It is desirable to define the borderline conditions of the current chemistry control program to be aware and prevent conditions conducive to pitting corrosion. These conditions may occur due to anticipated future waste streams that can change the chemistry of the waste in these tanks. The current corrosion control program primarily inhibits against localized corrosion due to nitrate. Electrochemical testing was utilized determine the borderline conditions for pitting to optimize the chemistry control program for DSTs. A statistically designed set of borderline conditions at high hydroxide concentration with different aggressive species (e.g., chloride, sulfate) in addition to nitrate was tested.

Key words: radioactive waste, carbon steel, pitting corrosion, electrochemical testing

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