[en] EPR (EPR: European Pressurized Water Reactor) has been developed to achieve higher output (1,600 MW) and longer plant life (60 years), compared with the conventional unclear reactors, and the first commercial reactor was introduced in Finland no.5/Olkiluoto no.3. The integrated mono-block design was applied for nozzle shell flange instead of welded conventional flange and nozzle shell. And due to set-on type nozzles, a 600 ton ingot was required for this part. JSW successfully completed the manufacturing of first nozzle shell with integral flange 11 months after melting. This report summarizes manufacturing technology and process, and properties of nozzle shell with integral flange. (author)