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96115 SLUDGE WASHING MATERIALS STUDY UPDATE: THE MATERIALS PERFORMANCE BEHAVIOR OF CARBON STEEL IN VERY DILUTE WASTE ENVIRONMENTS

Picture for 96115 SLUDGE WASHING MATERIALS STUDY
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Product Number: 51300-96115-SG
ISBN: 96115 1996 CP
Author: A. L. Lund, M. J. Danielson, G. T. MacLean
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For sludge washing to be conducted in existing Hanford carbon steel tanks, there must be an assurance that the tanks will be safe from failure by pitting, stress-corrosion cracking (SCC) or other failure processes when the corrosion inhibitors present in the waste are diluted during the sludge washing operation. Testing has been conducted previously to define safe operating regimes in concentrated waste environments and moderately dilute waste environments. Due to identification of unsafe operating regimes for moderately dilute waste environments, testing was conducted in more dilute environments to adequately capture the range of possible chemistries during sludge washing operations. Additionally, a small scoping study was performed to identify the corrosion effects of high levels of chloride in the waste environments. Six month exposure coupon tests, slow strain rate tests, and potentiodyuamic scans have been completed on a statistically designed test matrix of twenty-four tests. SCC was not found for the specimens in the static tests or the slow strain rate tests. Pitting and crevice corrosion was found for many of the solutions, but primarily in the vapor phase. Waterline attack at the vapor space/solution interface was common for the range of solutions tested. Gross general attack was found for the specimens exposed to the vapor space of the high chloride solutions. Keywords: Radioactive waste storage tanks, carbon steel, SCC, pitting, general attack, Hanford waste tanks
For sludge washing to be conducted in existing Hanford carbon steel tanks, there must be an assurance that the tanks will be safe from failure by pitting, stress-corrosion cracking (SCC) or other failure processes when the corrosion inhibitors present in the waste are diluted during the sludge washing operation. Testing has been conducted previously to define safe operating regimes in concentrated waste environments and moderately dilute waste environments. Due to identification of unsafe operating regimes for moderately dilute waste environments, testing was conducted in more dilute environments to adequately capture the range of possible chemistries during sludge washing operations. Additionally, a small scoping study was performed to identify the corrosion effects of high levels of chloride in the waste environments. Six month exposure coupon tests, slow strain rate tests, and potentiodyuamic scans have been completed on a statistically designed test matrix of twenty-four tests. SCC was not found for the specimens in the static tests or the slow strain rate tests. Pitting and crevice corrosion was found for many of the solutions, but primarily in the vapor phase. Waterline attack at the vapor space/solution interface was common for the range of solutions tested. Gross general attack was found for the specimens exposed to the vapor space of the high chloride solutions. Keywords: Radioactive waste storage tanks, carbon steel, SCC, pitting, general attack, Hanford waste tanks
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