围带自锁状态下内弧表面的最大离心应力发生在外拉筋孔截面的拉筋孔靠进汽侧处；
When the blade shroud under the status of self locking, the maximum centrifugal stress of the concave will occurred on the section of outer lace hole and nearby the leading edge.
开发USC机组的关键 ，在于开发热 强度 高、耐 高温腐蚀、耐汽侧氧化、技术上可行、经济上合理的新型 钢材。
The key technique for development of USC units is to develop a new type of steel material with high thermal strength, resistance to high temperature corrosion and oxidation at steam side.
早期投产的国产200MW机组因设备老化，其外置式疏水冷却器经常会产生汽侧筒体被蒸汽吹蚀及钢管泄漏等故障，影响了机组的安全运行和经济效益。
External drain coolers often leaks from the steam blowed barrel or tubes of the early 200MW units, which have an effect on safe and economic operation of the units.
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