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9号机系31—25—7型,制造厂编号第一台。1966年6月投产。运行以来共进行了五次揭大盖检修。1966年9月第一次揭盖检查,发现第12压力级叶片变形,同年10月在投1号低压加热器时,五段抽汽管内积水倒流又发生水冲击,当即停机检查,末级叶片又变形。1968年2月大修中发现第11压力级叶片根部出口边弯曲变形,1969年3月大修为进行超出力改进时,发现该级又变形,1970年1月超出力鉴定检修时,发现新的变形,但没有处理,在这次检修中后两级隔板集水环增开疏水槽。1972年2月揭盖检查,发现第10、11压力级叶片各断落一片,断口离叶根分别为87、15毫米处。
No. 9 machine type 31-25-7, the first factory number. Put into operation in June 1966. A total of five overhaul inspections were carried out since the operation. In September 1966, the first uncovering inspection revealed that the twelfth pressure grade blade was deformed. In the same year, when the low pressure heater was cast on No. 1 in October of the same year, water surge occurred in the fifth-stage pumping pipe, immediately shut down for inspection, Leaves and deformation. In February 1968 overhaul found 11th pressure level blade root outlet side bending deformation, March 1969 overhaul for the improvement of excess force found that level and deformation, in January 1970 exceeded the identification of inspection and repair, found a new deformation , But did not deal with, in this overhaul after the two diaphragm water ring open dredging tank. February 1972 uncovering inspection and found that the first 10,11 pressure-level leaves each one off, the fracture from the root of leaves were 87,15 mm.