Farley Main Steam Flow-Induced Vibration Investigation Available to Purchase

Piping vibration had been observed in the Farley Unit 2 main steam system since plant start-up. Hanger damage occurred in several portions of the system, including inside containment, in the Main Steam Valve Room (MSVR), and in the turbine building. A program was undertaken to determine the cause of the failures in the main steam supports. This program included the installation of diagnostic equipment, data analysis, and acoustic and structural modeling in an effort to determine the root cause of the piping vibration. The program also addressed a modified system support scheme, which included the addition of vibration absorbing and dampening devices. Recommendations were also provided to resolve the vibration issue.