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Application of Tuned Mass Damper to Mitigation of the Seismic Responses of Electrical Equipment in Nuclear Power Plants

1
R&D Center, Innose Tech Co., Ltd., 30 Songdomirae-ro, Yeonsu-gu, Incheon 21990, Korea
2
Academic-Industry Cooperation Foundation, Kunsan National University, 558 Daehak-ro, Gunsan-si 54150, Korea
3
Department of Civil & Railroad Engineering, Daewon University College, 316 Daehak-ro, Jecheon, Chung-Buk 27135, Korea
*
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 427; https://doi.org/10.3390/en13020427
Received: 26 December 2019 / Revised: 10 January 2020 / Accepted: 10 January 2020 / Published: 15 January 2020
A tuned mass damper (TMD) was developed for mitigating the seismic responses of electrical equipment inside nuclear power plants (NPPs), in particular, the response of an electrical cabinet. A shaking table test was performed, and the frequency and damping ratio were extracted, to confirm the dynamics of the cabinet. Electrical cabinets with and without TMDs were modeled while using SAP2000 software (Version 20, Computers and Structures, NY, USA) that was based on the results. TMDs were designed while using an optimization method and the equations of Den Hartog, Warburton, and Sadek. The numerical models were verified while using the shaking table test results. A sinusoidal sweep wave was applied as input to identify the vibration characteristics of the electrical cabinet over a wide frequency range. Applying various seismic loads that were adjusted to meet the RG 1.60 design response spectrum of 0.3 g then validated the control performance of the TMD. The minimum and maximum response spectrum reduction rates of the designed TMDs were 44.7% and 62.9%, respectively. Further, the amplification factor of the electrical cabinet with the TMD was decreased by 53%, on average, with the proposed optimization method. In conclusion, TMDs can be considered to be an effective way of enhancing the seismic performance of the electrical equipment inside NPPs. View Full-Text
Keywords: nuclear power plant; electrical cabinet; tuned mass damper; optimization method; seismic performance nuclear power plant; electrical cabinet; tuned mass damper; optimization method; seismic performance
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Cho, S.G.; Chang, S.; Sung, D. Application of Tuned Mass Damper to Mitigation of the Seismic Responses of Electrical Equipment in Nuclear Power Plants. Energies 2020, 13, 427.

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