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98175 DESIGN OF AN ELECTROCHEMICAL NOISE BASED CORROSION MONITORING PROBE FOR HIGH LEVEL NUCLEAR WASTE STORAGE TANKS

Product Number: 51300-98175-SG
ISBN: 98175 1998 CP
Author: G. L. Edgemon, J. L. Nelson
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High-level nuclear wastes at the Henford Site are stored underground in cmbon steel double-shell end single-shell tanks. The installation of a three-channel prototype corrosion monitoring system into double-shell tank 241-AZ-101 was completed in August 1996. A fidly operational eight-channel system based on the design and operation of the prototype was installed into doubleshell tank 241-AN-107 in September 1997. The 241-AN-107 system monitors fluctuations in corrosion current and potential (electrcchernical noise) occurring on eight electrode arrays immersed in the waste liquid and in the vapor space above the waste. The electrodes are designed to detect the onset of pitting and stress corrosion cracking should tank conditions change to allow these phenomena to occur. This paper focuses on the design of the 241-AN-107 corrosion probe. Keywords: electrochemical noise, pitting, stress corrosion cracking, localized corrosiou nuclear waste tank corrosion, mild steel, nitrates, corrosion surveillance, and corrosion-monitoring.
High-level nuclear wastes at the Henford Site are stored underground in cmbon steel double-shell end single-shell tanks. The installation of a three-channel prototype corrosion monitoring system into double-shell tank 241-AZ-101 was completed in August 1996. A fidly operational eight-channel system based on the design and operation of the prototype was installed into doubleshell tank 241-AN-107 in September 1997. The 241-AN-107 system monitors fluctuations in corrosion current and potential (electrcchernical noise) occurring on eight electrode arrays immersed in the waste liquid and in the vapor space above the waste. The electrodes are designed to detect the onset of pitting and stress corrosion cracking should tank conditions change to allow these phenomena to occur. This paper focuses on the design of the 241-AN-107 corrosion probe. Keywords: electrochemical noise, pitting, stress corrosion cracking, localized corrosiou nuclear waste tank corrosion, mild steel, nitrates, corrosion surveillance, and corrosion-monitoring.
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