Stress-Corrosion Cracking of Carbon Steel in Simulated Waste Solutions

A Structural Impact Assessment of Flaws Detected During Ultrasonic Examination of Tank 15

“…Previously, mid-plate leak sites were also correlated with weld attachments (see Tank 16 and Tank 6). The arc-like nature of the crack is also consistent with results observed during laboratory testing [15]. The visually observed portion of the crack is parallel to a weld fusion line.…”

“…The crack to the left of the repair is approximately 6 inches and appears to branch, while the portion of the crack to the right is approximately 4 inches. The arc-like pattern of the crack adjacent to the weld repair is consistent with laboratory results [15]. The behavior also agrees with the residual stress model for a narrow weld repair in that the crack is located a short distance from the weld repair fusion line.…”

“…A laboratory corrosion test program was performed to determine the failure mechanism in carbon steel tanks [15]. Welded test specimens were exposed to a simulated waste solution (5 M nitrate at 97 °C) to induce stress corrosion cracking.…”

Estimation of Failure Frequency for Type I and II High Level Waste Tanks

“…2,3 Stress-corrosion cracking is the formation of cracks in the presence of tensile stresses in a hostile environment. In addition, low carbon ferritic steels are commonly known to be susceptible to intergranular stress-corrosion cracking in nitrate solutions.…”

Compilation of Hanford corrosion studies

“…[20] Laboratory-scale experiments were made with C-ring Table III. Results of the tests with bent-beam specimens are given in Table IV.…”