This publication outlines the main aspects and issues to be considered when developing and improving dissimilar metal weld
inspections in nuclear power plants. It presents good practices and lessons learned and provides guidance to inspection organizations
and their managers, operating staff and to the local suppliers who provide inspection services for utilities, as well as some
practical case studies. The publication discusses requirements for an in-service inspection programme, different inspection
techniques and methods, inspection qualification and evaluation of its results and challenges for ultrasonic inspection of
dissimilar metal welds. The inspection programme and its requirements are based on the safety classification or safety significance
of the component. An important aspect of this publication is the discussion of dissimilar metal welds repair- and replacement
techniques and how to mitigate or remove cracks and corrosion that might have an impact on the safety margins.