The liner of turbine draft tube in Ankang Water Power Station was punched by cavitation,which leads to welding crack,metal shed and concrete delve,water spurting out.The cause of the damage is analyzed,the treatment is expounded.

• 论述了安康水电站水轮机尾水管里衬被汽蚀破坏穿透、焊缝开裂、撕裂掉块、混凝土掏空、大量喷水的事故原因及处理方法。