CAP1000核反应堆压力容器一体化底封头锻件研制

Development of Integrative Bottom Head Forging for CAP1000 Nuclear Reactor Pressure Vessel

为实现CAP1000核反应堆压力容器堆芯筒体以下部位无贯穿孔、无焊缝,排除设备泄漏导致失水事故的可能性,对过渡段及下封头组合的一体化底封头锻件进行研制。研制过程中,通过数值模拟、实验室物理模拟验证并优化了CAP1000核反应堆压力容器一体化底封头锻件锻造及热处理工艺方案。采取预制板坯结合二次冲压成形锻造技术,完成了CAP1000核反应堆压力容器一体化底封头锻件整体锻造成形,工艺效果良好。通过正火+淬火+回火性能热处理方式及优化淬火工艺装备,实现了超深球形一体化底封头锻件性能调控热处理。检测结果表明,锻件尺寸及各项指标满足采购规范要求,且富裕度良好。

In order to realize the non-perforation and non-weld in the lower part of CAP1000 nuclear reactor pressure vessel core barrel and eliminate the possibility of loss of coolant accident caused by equipment leakage,an integrative bottom head forging with transition section and lower head combination was developed.The forging and heat treatment process of CAP1000 nuclear reactor pressure vessel integrative bottom head forging was verified and optimized by numerical simulation and laboratory physical simulation.Integrative bottom head forging for CAP1000 nuclear reactor pressure vessel was completed by prefabricated slab combined with twice stamping forging technology.Through normalizing-quenching-tempering performance heat treatment and optimization of quenching process equipment,the ultra-deep spherical integrative bottom head forging performance-controlled heat treatment is realized.The test results show that the forging size and various indicators meet the requirements of procurement specifications.