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Test Plan to Update SRS High Level Waste Tank Material Properties Database by Determining Synergistic Effects of Dynamic Strain Aging and Stress Corrosion Cracking

Description: The structural integrity of High Level Waste tanks is defined by the demonstrated confinement of the waste by the tank structure under design basis conditions. a comprehensive test plan is presented here to develop a mechanical and corrosion properties database to develop a fundamental understanding of the synergistic effects of DSA and SCC due to high temperature service of the HLW tanks.
Date: March 20, 2002
Creator: Subramanian, K.H.
Partner: UNT Libraries Government Documents Department

Fracture Toughness Testing of ASTM A285 Steel for Fracture Analysis of Savannah River Site Storage Tanks

Description: The fracture toughness properties of A285 steels are being measured at specific material and test conditions for application to elastic-plastic fracture mechanics analysis of storage tanks at the Department of Energy Savannah River Site.
Date: May 15, 2001
Creator: Subramanian, K. H.
Partner: UNT Libraries Government Documents Department

Vapor Corrosion Program Plan

Description: Radioactive wastes are contained in 48 underground storage tanks at the Savannah River Site (SRS). The materials and structures of the tanks provide a confinement function by maintaining leak integrity and structural stability. It is essential that the potential changes in properties of the structural materials due to service environment be evaluated and that conditions that can cause significant (active) degradation be avoided or mitigated. Aging mechanisms are those which cause changes in the materials including degradation of the materials. Degradation is either a reduction of the mechanical properties (e.g., loss of toughness or ductility), or a loss of net section of materials (e.g., cracking, pitting, thinning), or both which reduces the level of confinement inherent in the original installed condition and could lead to failure of confinement.
Date: May 22, 2002
Creator: Subramanian, K.H.
Partner: UNT Libraries Government Documents Department

Pitting Corrosion in the Vapor Space and Liquid/Air Interface of High Level Radioactive Waste Tanks

Description: Corrosion in the vapor space and at the liquid/air interface of the Department of Energy (DOE) high level waste (HLW) tanks have emerged as potentially active corrosion mechanisms. Controls on the solution chemistry are in place to preclude the initiation and propagation of further nitrate induced pitting and stress corrosion cracking. However, recent experience has shown that steel not in contact with the bulk waste solution but exposed to the ''vapor space'' above the bulk waste and the liquid/air interface may be vulnerable to pitting or stress corrosion cracking. Experimentation was performed to determine the influence of steel surface characteristics and solution chemistry on pitting rates within the vapor space and at the liquid/air interface on ASTM A537 steels, the materials of construction of the tanks. The results suggest that inhibited bulk solution chemistry does not ensure pitting protection within the vapor space when there are surface inhomogeneities. However, the characteristic residual salts on the steel play a key role in the pitting characteristics.
Date: January 30, 2004
Creator: Subramanian, K.H.
Partner: UNT Libraries Government Documents Department

Fracture Toughness Properties of Savannah River Site Storage Tank ASTM A285 Low Carbon Steel

Description: A materials test program was developed to measure mechanical properties of ASTM A285 Grade B low carbon steel for application to structural and flaw stability analysis of storage tanks at the Department of Energy (DOE) Savannah River Site (SRS). Under this plan, fracture toughness and tensile testing are being performed at conditions that are representative of storage tank
Date: May 22, 2002
Creator: Subramanian, K.H.
Partner: UNT Libraries Government Documents Department

Review of Corrosion Inhibition in High Level Radioactive Waste Tanks in the DOE Complex

Description: Radioactive waste is stored in underground storage tanks at the Department of Energy (DOE) Savannah River Site (SRS). The waste tanks store supernatant liquid salts, consisting primarily of sodium nitrate, sodium nitrite, sodium hydroxide, and sludge. An assessment of the potential degradation mechanisms of the high level waste (HLW) tanks determined that nitrate- induced pitting corrosion and stress corrosion cracking were the two most significant degradation mechanisms. Controls on the solution chemistry (minimum nitrite and hydroxide concentrations) are in place to prevent the initiation and propagation of pitting and stress corrosion cracking in the tanks. These controls are based upon a series of experiments performed using simulated solutions on materials used for construction of the tanks. The technical bases and evolution of these controls is presented.
Date: March 8, 2004
Creator: Subramanian, K.H.
Partner: UNT Libraries Government Documents Department

Corrosion Control Measures For Liquid Radioactive Waste Storage Tanks At The Savannah River Site

Description: The Savannah River Site has stored radioactive wastes in large, underground, carbon steel tanks for approximately 60 years. An assessment of potential degradation mechanisms determined that the tanks may be vulnerable to nitrate- induced pitting corrosion and stress corrosion cracking. Controls on the solution chemistry and temperature of the wastes are in place to mitigate these mechanisms. These controls are based upon a series of experiments performed using simulated solutions on materials used for construction of the tanks. The technical bases and evolution of these controls is presented in this paper.
Date: November 27, 2012
Creator: Wiersma, B. J. & Subramanian, K. H.
Partner: UNT Libraries Government Documents Department