[en] This report, prepared for those concerned with in-service inspection on nuclear plant piping, presents a summary of work conducted under EPRI Research Project to improve the reliability of IGSCC (intergranular stress corrosion cracking) detection by ultrasonic techniques is presented concerning nuclear plant piping in-service inspection. It consists of a brief assessment of the IGSCC incidents followed by a summary of the overall EPRI UT reliability improvement progam and abstracts of contractor-prepared design and evaluation reports. The complete reports are provided as appendixes. The transducer which resulted from this work has gained wide acceptance in nuclear plant inspection throughout the world