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Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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In-Cabinet Response Spectrum Comparison of Battery Charger by Numerical Analysis and Shaking Table Test

수치해석 및 진동대 실험을 통한 충전기의 캐비닛내부응답스펙트럼(ICRS) 결과 비교

  • Received : 2019.04.30
  • Accepted : 2019.06.18
  • Published : 2019.06.30
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Abstract

The seismic capacity of electric cabinets in Nuclear Power Plants (NPPs) should be qualified before installation and be maintained during operation. However it can happen that identical devices cannnot be produced for replacement of devices mounted in electric cabinets. In case of when no In-Cabinet Response Spectrum (ICRS) is available for new devices, ICRS can be generated by using Finite Element Analysis (FEA). In this study we investigate structural response and ICRSs of battery charger which is supplied to NPPs. Test results on the battery charger are utilized in this study. The response is measured by accelerometers installed on the housing of the battery charger and local panels in the battery charger. Numerical analysis model is established based on resonant frequency search test results and validated by comparison with 2 types of earthquake testing results. ICRSs produced from the numerical model are compared with measured ICRSs in the seismic tests. Developed analysis model is a simple reduced model and anticipates ICRSs quite well as measured response in the tests overall despite of its structural limitation.

Keywords

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Fig. 1 Battery charger and locations of accelerometers(4)

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Fig. 2 Amplitude of transfer function at accelerometer A6 in resonant frequency search test #1 and #2(4)

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Fig. 3 Averaged transmissibility of transfer function at the accelerometer A6,7,8,9

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Fig. 4 3-dimensional analytic model of local panels, at which accelerometers place, for modal analysis

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Fig. 5 Analytic model of the battery charger

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Fig. 6 Transmissibility of transfer function at the accelerometer A6 in X-dir.

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Fig. 7 Averaged transmissibility of transfer function at the accelerometer A6 in X-dir.

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Fig. 8 Transmissibility of transfer function at the accelerometer A6 in Y-dir. (Test #2, 7, 13, 21)

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Fig. 9 Averaged transmissibility of transfer function at the accelerometer A6 in Y-dir.

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Fig. 10 Transmissibility of transfer function at the accelerometer A6 in Z-dir.

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Fig. 11 Estimated time history data and response Spectra at the accelerometer A6 under Uljin seismic loading

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Fig. 12 Estimated time history data and response Spectra at the accelerometer A6 under REG 1.60 seismic load

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Fig. 13 Estimated time history data and ICSR at the accelerometer A7 under Uljin seismic loading

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Fig. 14 Estimated time history data and ICSR at the accelerometer A7 under REG 1.60 seismic load

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Fig. 15 Estimated time history data and ICSR at the accelerometer A8 under Uljin seismic loading

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Fig. 16 Estimated time history data and ICSR at the accelerometer A8 under REG 1.60 seismic load

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Fig. 17 Estimated time history data and ICSR at the accelerometer A9 under Uljin seismic loading

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Fig. 18 Estimated time history data and ICSR at the accelerometer A9 under REG 1.60 seismic load

References

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