Applicability of ASME Code CaseN-770-1, as Conditioned by Federal Regulation, to Branch Connection Butt Welds

摘要

The U.S. Nuclear Regulatory Commission (NRC) is seeking public comment on draft regulatory issue summary (RIS) 2014-XX. This draft RIS is addressed to all holders of an operating license or construction permit for a pressurized water nuclear power reactor under the NRC's regulations, except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vessel. This draft RIS would inform these entities about reactor coolant system Alloy 82/182 branch connection dissimilar metal nozzle weld that may be of a butt weld configuration and therefore require inspection under the NRC's regulations. This RIS also informs these entities of a licensee's recent misclassification and missed inspections to Alloy 82/182 dissimilar metal butt welds in branch connections of primary coolant loop piping.