On the basis of a domestic nuclear power construction project and analysis on material characteristics that the main steam and main feedwater pipeline of the conventional island in nuclear power plants should have

the material selection of domestic and foreign congeneric pipelines were widely collected and studied.Moreover

demonstration and comparative analysis were sufficiently conducted.Finally

the WB36 CN1was chosen as the material for main steam and main feedwater pipes in conventional island of the 1 000 MW nuclear power plant.Via optimizing the chemical composition

controlling the manufacture and smelt process

serializing and standardizing the piping dimension

the WB36 CN1localization technical specification was ultimately formed.Performance of the first batch trial-produced WB36 CN1seamless pipes was fully satisfied with the requirements of WB36S1in German Vd TüV 459/2(2001version).At last

the mass production pipes were successfully applied to this nuclear power plant.