Dynamic and seismic analysis on the hot reheat pipe of 660 MW unit in a coal fired power plant have been calculated by CAESAR II stress analysis software. To reduce the impact of occasional loads on the whole piping and equipments furthest

some dampers are set on the pipe so that the performance of resistance to occasional loads of the whole piping and equipments increases to a great extent and the safety operation of the coal fired power plant would be ensured.Meanwhile

in line accordance with the characteristic of the course of stress calculation

the mutual impacts between dynamic condition and seismic condition are indicated

which would be for reference for later projects.