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大亚湾核电站汽轮机转子末级叶片是采用GEC-A设计制造的MARKⅡ型叶片枞树型叶根。由于GEC-A未改进前的末级叶片在其它电厂发现过裂纹,大亚湾核电站很早就开始实施反馈性预防检查,但需要拆除末级叶片,而一次拆装检查需要8～9d,成为核电厂常规换料大修中的关键瓶径,并可能产生因拆卸而带来的机械损伤风险。因此,找到延长低压缸拆装叶片的周期的方法,将可以实现在保证核电厂汽轮机组可靠性的同时进一步提高经济性。通过多年的调研及试验,相控阵超声波原位检查技术可以满足此目的,并已在现场得到成功应用。
Daya Bay Nuclear Power Station Steam Turbine rotor last stage blades are designed and manufactured using GEC-A MARK Ⅱ leaf fir tree roots. Due to the fact that the last blade before GEC-A improvement was found to have cracked in other power plants, Daya Bay Nuclear Power Station started retrospective preventive inspection very early on but needed to dismantle the last-stage blades, and a dismantling inspection took 8 to 9 days to become a nuclear power plant The key bottleneck in routine refueling overhauls and the risk of mechanical damage due to disassembly. Therefore, finding a way to prolong the cycle of low-pressure cylinder disassembly and assembly will further improve the economy while ensuring the reliability of the steam turbine of a nuclear power plant. Through years of research and testing, phased array ultrasound in situ inspection technology can meet this purpose and has been successfully applied in the field.