Four-point bend testing of microbiologically induced corrosion (MIC) damaged piping was conducted to assess the effect of MIC defects on structural integrity and the possibility of opening a MIC pit during a seismic event. The tests were performed on specimens fabricated from the Sequoyah Nuclear Plant Emergency Raw Water Cooling (ERCW) System 6-inch, schedule 40 piping, 316 stainless steel butt welds that were MIC-damaged during operation, and the one undamaged butt weld. No enhanced water leakage was observed until well beyond the yield point at loads approximately four times the maximum faulted load for pipe welds containing up to 5-1/2 inches of total circumferential MIC damage. Additionally, MIC-damaged piping sustained maximum loads equivalent to undamaged piping.

Subject
Pits, Test methods, Water, Materials, Piping, Leaks, Spray coating, Bending, Plastics, Specimen preparation, Health, safety, and environment, Damage, Microbiologically influenced corrosion
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1990
Association for Materials Protection and Performance (AMPP)
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