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Evaluation Of Pitting Penetration Associated With Steel Exterior Of Hanford Tanks

Evaluation of Pitting Penetration Associated with Steel Exterior of Hanford Tanks
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The Hanford site contains approximately 55 million gallons (2.08 x 108 liters) of radioactive and chemically hazardous wastes arising from weapons production, beginning with World War II and continuing through he Cold War era. The wastes are stored in 177 carbon steel underground storage tanks, of which 149 are single-shell tanks (SSTs) and the remaining are double-shell tanks (DSTs). Historically, tank failures have been associated with the SSTs

Product Number: 51322-18002-SG
Author: K.J. Evans, S. Chawla, K.M. Sherer, B.C. Rollins, J.A. Beavers, J. S. Page and C.L. Girardot, N. Sridhar
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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$20.00
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Radioactive and chemically hazardous wastes are stored at the Hanford site in underground double-shell tanks (DSTs) constructed of carbon steel. The corrosion management of these tanks has largely focused on the complex waste chemistries that reside within the interiors of the primary tanks. More recently, attention has been given to the corrosion that has been found on the exterior of the secondary liners of the DSTs. The cause of the external corrosion seems to be related to the intrusion and accumulation of groundwater in the tertiary leak detection systems, which exist under the concrete foundations of the DSTs. The external corrosion has led to significant wall-loss (up to 70% in one of the tanks), which has occurred in a localized manner (broad pitting). In addition, site measurements have indicated that the most significant areas of wall-loss are aligned with the slots (drain channels) of the concrete foundation.

Radioactive and chemically hazardous wastes are stored at the Hanford site in underground double-shell tanks (DSTs) constructed of carbon steel. The corrosion management of these tanks has largely focused on the complex waste chemistries that reside within the interiors of the primary tanks. More recently, attention has been given to the corrosion that has been found on the exterior of the secondary liners of the DSTs. The cause of the external corrosion seems to be related to the intrusion and accumulation of groundwater in the tertiary leak detection systems, which exist under the concrete foundations of the DSTs. The external corrosion has led to significant wall-loss (up to 70% in one of the tanks), which has occurred in a localized manner (broad pitting). In addition, site measurements have indicated that the most significant areas of wall-loss are aligned with the slots (drain channels) of the concrete foundation.

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