Characterization of the corrosion behavior of the carbon steel liner in Hanford Site single-shell tanks

Technical Report · Wed Jun 01 00:00:00 EDT 1994

DOI:https://doi.org/10.2172/10173121· OSTI ID:10173121

Anantatmula, R P; Schwenk, E B ^[1]; Danielson, M J ^[2]

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1. Westinghouse Hanford Co., Richland, WA (United States)
2. Pacific Northwest Lab., Richland, WA (United States)

Six safety initiatives have been identified for accelerating the resolution of waste tank safety issues and closure of unreviewed safety questions. Safety Initiative 5 is to reduce safety and environmental risk from tank leaks. Item d of Safety Initiative 5 is to complete corrosion studies of single-shell tanks to determine failure mechanisms and corrosion control options to minimize further degradation by June 1994. This report has been prepared to fulfill Safety Initiative 5, Item d. The corrosion mechanisms that apply to Hanford Site single-shell tanks are stress corrosion cracking, pitting/crevice corrosion, uniform corrosion, hydrogen embrittlement, and microbiologically influenced corrosion. The corrosion data relevant to the single-shell tanks dates back three decades, when results were obtained from in-situ corrosion coupons in a few single-shell tanks. Since that time there have been intertank transfers, evaporation, and chemical alterations of the waste. These activities have changed the character and the present composition of the waste is not well characterized. All conclusions and recommendations are made in the absence of relevant laboratory experimental data and tank inspection data. The report attempts to identify the failure mechanisms by a literature survey of carbon steel data in environments similar to the single-shell tank wastes, and by a review of the work performed at the Savannah River Site where similar wastes are stored in similar carbon steel tanks. Based on these surveys, and in the absence of data specific to Hanford single-shell tanks, it may be concluded that the single-shell tanks identified as leakers failed primarily by stress corrosion cracking due to the presence of high nitrate/low hydroxide wastes and residual stresses. In addition, some failures may be attributed to pitting under crevices in low hydroxide locations.

• Research Organization: Westinghouse Hanford Co., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-87RL10930
• OSTI ID: 10173121
• Report Number(s): WHC-EP-0772; ON: DE94016475; BR: 35AF11201/35AF11202; TRN: 94:015605
• Resource Relation: Other Information: PBD: Jun 1994
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
HANFORD RESERVATION
RADIOACTIVE WASTE STORAGE
SAFETY ANALYSIS
TANKS
LINERS
CORROSION
CARBON STEELS
FAILURE MODE ANALYSIS
STRESS CORROSION
CRACK PROPAGATION
PITTING CORROSION
CREVICE CORROSION
HYDROGEN EMBRITTLEMENT
BIOLOGICAL FOULING
CORROSION PROTECTION
RECOMMENDATIONS
054000
052002
360105
HEALTH AND SAFETY
WASTE DISPOSAL AND STORAGE
CORROSION AND EROSION