Steam generator transfers the heat generated by the reactor to the secondary feed water and produces saturated steam to the turbo generator. It undertakes the safety function of the nuclear power unit as an integral part of the primary loop pressure boundary.This article introduces the manufacturing process,impact test method and test results of product weld test coupon of the steam generator primary side nozzle safety end,and the unqualified cause of impact test was determined. Processing method of removing safety end and rewelding qualified safety end was used,the weld quality is qualified and the quality of steam generator product satisfied the requirements.