Damage prevention design of the branch pipe under pressure pulsation transmitted from main steam header |
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Authors: | Yeon-Whan Kim Young-Shin Lee |
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Affiliation: | (1) Korea Electric Power Research Institute Munji-dong, Yuseong, Daejeon, 305-380, Korea;(2) Director of BK21 Mechatronics Group, Department of Mechanical Design Engineering, Chungnam National University, Daejeon, Korea |
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Abstract: | Vibration has severely increased at the branch pipe of the main steam header since the beginning of commercial operation of
nuclear power plants. Intense broadband disturbance flow at a discontinuous region such as elbows, valves or headers generates
an acoustical pulsation which is propagated through the piping system. The pulsation becomes the source of low frequency vibration
at the piping system. If it coincides with the natural frequency of the pipe system, excessive vibration results. High-level
vibration due to the pressure pulsation related to high dynamic stress, and ultimately, to failure probability fatally affects
the reliability and confidence of the plant piping system. This paper discusses steady-state high vibrations appearing in
the branch piping system due to the effect of acoustical pulsations transmitted from the large main steam header by broadband
turbulence in a 700 MW power plant. The excitation sources and response of the piping system are investigated by using on-site
measurements and analytical approaches. Energy absorbing restraints with additional stiffness and damping factor were designed
and installed to reduce vibration damage. |
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Keywords: | Branch pipe Low frequency Steady-state vibration Turbulence Acoustic pressure pulsation Dynamic stress Resonance avoidance |
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