Evaluation of Ultrasonic Phased Array Testing for Reactor Piping System Components Containing Dissimilar Metal Welds. Technical Letter Report

摘要

This document is a technical letter report (TLR) summarizing confirmatory research and laboratory evaluations of phased-array (PA) ultrasonic testing (UT) on reactor coolant system (RCS) components containing dissimilar metal welds (DMWs). The technical evaluations described here were conducted on a set of smaller bore DMW mock-ups representing various component configurations where Alloy 600/82/182 material was used in conjunction with either wrought steel or cast austenitic stainless steel (CASS) piping components. This work was performed at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington. The effort was conducted as part of a funded program sponsored by the U.S. Nuclear Regulatory Commission (NRC) titled, Reliability of Nondestructive Examination for Nuclear Power Plant Inservice Inspection, under Task 2 of JCN N6398. This TLR is submitted as an Operating Plan Milestone deliverable for Task 2. The general focus of this research effort is to determine the effectiveness and reliability of advanced nondestructive examination (NDE) methods on light-water reactor (LWR) components containing DMWs and other coarse-grained components that encompass CASS.