Vibration Analysis of High Pressure Cylinder Steam Inlet Pipes During Turbine Startup in Nuclear Power Plant

Abstract

Vibration and dynamic strain measurement of high pressure cylinder (HPC) steam inlet pipes(SIP) is carried out during turbine startup in a nuclear power plant. The operation state of the pipes was analyzed and evaluated combined with the unit electric power, the turbine speed and the opening of control valves. The result shows that the pipe vibration velocity exceeds the allowable limit during the turbine startup and low electric power platform. And pipe vibration is synchronous to the control valves quick operation. The alternating stress is lower than the allowable value during the whole process. Pipe vibration is mainly caused by the steam flow excitation when the control valves operate quickly