20th International Forgemasters Meeting - IFM 2017

It is important to deliver integrated forgings for elimination of in-service-inspection and improvement of quality of large forgings. Integrated forgings could be manufactured by integration of head with various nozzles by removing weld seams which is located between two parts. This manufacturing technology should be adequately designed to ensure accurate final dimension, internal material quality and required material properties such as tensile and impact properties. In general, finite element analyses can be carried out to obtain the adequate forging process on the various kinds of forgings for nuclear power plant. The analysis results were effective to get a superior quality and to reduce the trial and error time during making the large forgings. This paper introduces the development experiences of Doosan heavy industries for replacement nuclear power plant. Computer simulation, 1/30 scale lead test, 1/5 scale prototype test and 1/1 scale mockup test were carried out to develop proper forging process. Then, manufactured integrated forgings were successfully delivered to commercial nuclear power plant of USA for fabrication.