压水堆-回路管道的铸造工艺及其国产化

工艺评定表明,1 000 Mw压水堆核电厂(CPR1000)原选用的主管道铸件Z3CN20-09M(法国牌号)不锈钢的化学成分符合RCC-M采购技术规范,但力学性能并不能完全满足压水堆核岛机械设备设计和建造规范(RCC-M)的要求.本文从金属学角度分析了Z3CN20-09M不锈钢抗蚀性特点和力学性能强化机理,确立了主管道铸件冶炼化学成份的内控标准,使CPR1000核电厂核岛主管道铸件(以下简称主管道铸件)的工艺评定在保持抗蚀性和可焊性特点前提下,各项力学性能指标均满足RCC-M标准,且有较大的裕度,离散度小,质量稳定,综合性能达到领先水平.

Casting Technique for Primary Coolant Piping for Pressurized Water Reactor Power Plant and Its Localization

The required chemical content range of Primary Coolant Piping (Static cast elbow, centri-fugally cast pipe) by Design and Construction Rules for Mechanical Components of PWR Nuclear Islands (RCCM) (French Norm) is wide. The result of manufacturing qualification test, which was performed by YANTAI TAIHAI MANOIR NUCLEAR EQUIPMENT CO. LTD. (THM), shows that qualification pieces satisfied the chemical requirement of RCCM may not satisfy its mechanical requirement. CNPEC/ECE together with THM analyzed the anticorrosion and strengthening mechanism of Material Z3CN2009M (French Brand) for Cast piece of 1000 MW PWR (CRPI000) Primary Coolant Piping through metallography methods. Strictly internal chemical control range of ladle analysis was established and it makes the mechani-cal property of cast piece of CPR1000 PWR Primary coolant piping satisfy the RCCM requirement without losing the anti-corrosion property and weld ability. The mechanical test value obtained has rich margin, little degree of separation and exhibits stable quality and advanced overall properties. This success solved the pre-liminary requirement for domestic making of Primary Coolant Piping of NINGDE and YANGJIANG Nuclear Power Plant and finally realized the domestic manufacturing of Primary Coolant Piping cast piece for CRP 1000 Nuclear Power Plant.