B-25 Corrosion Evaluation Summary Report; FINAL

A destructive examination of a B-25 waste storage container that was buried in a shallow non-radiological land burial facility for approximately 8 years showed that pitting was the most prevalent form of corrosion and suggested that continued burial would result in through-wall pits after 30 years. This result suggests that through wall pits will provide a path for water flow into and out of similar B-25 containers after approximately 30 years of burial. Pitting was the most severe on the exterior of the lid. However, the lid had collapsed into the container, probably because the soil loading exceeded the support capacity of the lid. This observation demonstrates that lid strength is a significant factor when assessing structural integrity of the B-25 containers. The lid had collapse had allowed the container to fill with soil and water. A review of procurement specifications for the B-25 containers suggest that the container examined in this work was purchased from an earlier ve rsion of the B-25 container procurement specification