Abstract
Several instrument tubes vibrated during the C stage commissioning period of a PWR nuclear power plant. This essay firstly analyzed the selection of instrument tubes and the velocity of the tubes vibration. Moreover, the author proposed solution towards the tubes vibration which was proved to be effective after applying on the nuclear power plant instrument tubes. The method proposed should be applicable when similar situation reoccurred in other plants.
Highlights
Thermal instruments are important parts of the nuclear power plant automation system and key to ensuring the safety of nuclear power plant operation
During the C stage commissioning period of a domestic pressurized water reactor nuclear power plant, the vibration did not raise the risk of fatigue fracture, the instrument tubes vibrated several times within the range of the conventional island
Since the instruments are responsible for monitoring the status of the units and some are directly affecting the operating status of the nuclear island and conventional island, the fatigue fraction caused by instrument tubes vibration may lead to unplanned trips or reactor jumps of the unit, and this could lower the safety and economic benefit
Summary
Thermal instruments are important parts of the nuclear power plant automation system and key to ensuring the safety of nuclear power plant operation. During the C stage commissioning period of a domestic pressurized water reactor nuclear power plant, the vibration did not raise the risk of fatigue fracture, the instrument tubes vibrated several times within the range of the conventional island. Since the instruments are responsible for monitoring the status of the units and some are directly affecting the operating status of the nuclear island and conventional island, the fatigue fraction caused by instrument tubes vibration may lead to unplanned trips or reactor jumps of the unit, and this could lower the safety and economic benefit. Since the instrument pipe itself was long and flexible, when the stress hit its highest, there should appear cracks at first and lead to fatigue fracture if no support was provided to fix the tubes[1]
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