TECHNICAL BASIS FOR PROPOSED REVISIONS TO CODE CASE N-806, EVALUATION OF METAL LOSS IN CLASS 2 AND 3 METALLIC PIPING BURIED IN A BACK-FILLED TRENCH

ABSTRACT ASME Section XI Code Case N-806, for evaluation of metal loss in Class 2 and 3 metallic piping buried in a backfilled trench, was published in 2012. This Code Case has been prepared by the ASME Section XI Task Group on Evaluation Procedures for Degraded Buried Pipe. The Code Case addresses the nuclear industry need for evaluation procedures and acceptance criteria for the disposition of metal loss that is discovered during the inspection of metallic piping buried in a back-filled trench