Seismic-Upgrading of Existing Stacks of Nuclear Power Station Using Structural Control Oil Dampers

Abstract eng:
This paper discusses a seismic-upgrading project for 100m-high steel stacks in a nuclear power station. For this upgrading, we reexamined seismic loads, and set up a new target earthquake that exceeds the original design loads when the stack was designed. First, we examined the possibility of conventional reinforcement by building a new supporting tower to surround the existing stack. It was, however, clarified that several problems would remain unsolved with such simple reinforcement. In order to provide high damping as well as higher strength, we planned to link the stack and the supporting tower via oil dampers. Numerical analysis results showed remarkable response reduction effects, but also clarified that the required damper’s stroke would need to be over 200mm and its velocity almost 2.0m/sec, which beyond the performance of existing products. Thus, we developed a high-performance oil damper that meets these stringent specifications. This paper presents the upgrading plan, simulation results and the newly developed oil damper.

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