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

The U.S. Nuclear Regulatory Commission (NRC) is issuing Regulatory Issue Summary (RIS) 2015-10, ``Applicability of ASME Code Case N-770-1, as Conditioned by Federal Regulation, to Branch Connection Butt Welds.'' This RIS is intended to inform addressees about reactor coolant system Alloy 82/182 branch connection dissimilar metal nozzle welds that may be of a butt weld configuration and, therefore, require inspection under the NRC's regulations. This RIS is addressed to all holders of an operating license or construction permit for a pressurized water nuclear power reactor under applicable NRC regulations, except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vessel.