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钢制安全壳是AP1000核电站的安全屏障,在反应堆冷却剂失水事故中包容堆芯辐射,是冷却系统中最重要的设备之一。钢制安全壳封头瓣片为多曲率高强度调质中厚板,采用单板温整体模压成形,选择合理的成形温度是控制投资成本和保证瓣片成形精度的关键因素之一。基于PAM-STAMP 2G有限元软件,对AP1000钢制安全壳封头瓣片在多种温度下的压制成形进行有限元模拟,综合分析压制力、成形后的回弹量、应力、应变和板厚减薄量等要素,结合钢板从加热炉转运、压制过程中的热量散失,确定了钢制安全壳封头瓣片单板整体温模压成形温度,为保证瓣片成形几何精度提供保障。
Steel Containment is a safety barrier to the AP1000 nuclear power plant. Inclusion of core radiation in reactor coolant loss accidents is one of the most important equipment in cooling systems. The steel containment head seal is a multi-curvature, high-strength, medium-tempered plate. One-piece temperature molding is adopted. Selecting a reasonable forming temperature is one of the key factors to control the investment cost and ensure the forming accuracy of the valve. Based on the finite element software PAM-STAMP 2G, the finite element simulation of the forming of the AP1000 steel containment flaps at various temperatures was carried out. The compressive force, springback after forming, stress, strain and thickness Thinning and other elements, combined with the transfer of steel from the heating furnace, the heat loss during the compression process, to determine the steel containment head flap veneer overall temperature molding temperature, to ensure the accuracy of flap forming geometry to provide protection.