Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Dynamic characteristics of single door electrical cabinet under rocking: Source reconciliation of experimental and numerical findings

  • Jeon, Bub-Gyu (KOCED Seismic Simulation Test Center, Pusan National University) ;
  • Son, Ho-Young (Department of Civil Engineering, Kyung Hee University) ;
  • Eem, Seung-Hyun (Department of Conversion & Fusion System Engineering, Major in Plant System Engineering, Kyungpook National University) ;
  • Choi, In-Kil (Smart Structural Safety & Prognosis Research Division, Korea Atomic Energy Research Institute) ;
  • Ju, Bu-Seog (Department of Civil Engineering, Kyung Hee University)
  • Received : 2020.11.02
  • Accepted : 2021.01.03
  • Published : 2021.07.25
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Abstract

Seismic qualifications of electrical equipment, such as cabinet systems, have been emerging as the key area of nuclear power plants in Korea since the 2016 Gyeongju earthquake, including the high-frequency domain. In addition, electrical equipment was sensitive to the high-frequency ground motions during the past earthquake. Therefore, this paper presents the rocking behavior of the electrical cabinet system subjected to Reg. 1.60 and UHS. The high fidelity finite element (FE) model of the cabinet related to the shaking table test data was developed. In particular, the first two global modes of the cabinet from the experimental test were 16 Hz and 24 Hz, respectively. In addition, 30.05 Hz and 37.5 Hz were determined to be the first two local modes in the cabinet. The high fidelity FE model of the cabinet using the ABAQUS platform was extremely reconciled with shaking table tests. As a result, the dynamic properties of the cabinet were sensitive to electrical instruments, such as relays and switchboards, during the shaking table test. In addition, the amplification with respect to the vibration transfer function of the cabinet was observed on the third floor in the cabinet due to localized impact corresponding to the rocking phenomenon of the cabinet under Reg.1.60 and UHS. Overall, the rocking of the cabinet system can be caused by the low-frequency oscillations and higher peak horizontal acceleration.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20201510100010) and This research was supported by a grant (20IFIP-B128598-04) from Industrial Facilities & Infrastructure Research (IFIP) funded by Ministry of Land, Infrastructure and Transport of Korean government.

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