HPR1000 steam generator is the third generationa nuclear power technology which be developed independently by China.This paper introduces the structural characteristics of HPR1000 steam generator

and describes the welding materials and process requirements for its key parts. Meanwhile

the key welding processes to be implemented

such as the stainless steel cladding weld of primary head

tube sheet cladding weld

tube-to-tube sheet weld

primary nozzle safe end weld

have been introduced in detail. It lays a foundation for the mass production of subsequent HPR1000 steam generator and provides a powerful technical guarantee.