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Seismic Performance Evaluation of the Li-Polymer Battery Rack System for Nuclear Power Plant

원자력발전소용 리튬폴리머 배터리 랙 시스템의 내진성능평가

  • Kim, Si-Jun (Department of Architectural Engineering, Kyonggi University)
  • 김시준 (경기대학교 건축공학과)
  • Received : 2019.03.12
  • Accepted : 2019.05.03
  • Published : 2019.05.31

Abstract

After the Fukushima nuclear accident, a new power supply using a lithium polymer battery has been proposed the first time in the world as the safety of the emergency battery facility has been required. It is required to have the safety of the rack system in which the battery device is installed in order to apply the proposed technology to the field. Therefore, the purpose of this study is to evaluate the seismic performance of string and rack frame for lithium-polymer battery devices developed for the first time in the world to satisfy 72 hours capacity. (1) The natural frequency of the unit rack system was 9 Hz, and the natural frequency before and after the earthquake load did not change. This means that the connection between members is secured against the design earthquake load. (2) he vibration reduction effect by string design was about 20%. (3) As a result of the seismic performance test under OBE and SSE conditions, the rack frame system was confirmed to be safe. Therefore, the proposed rack system can be applied to the nuclear power plant because the rack system has been verified structural safety to the required seismic forces.

후쿠시마 원전사고 이후 비상 배터리 시설에 대한 안전성 강화가 요구되면서 리튬 폴리머 배터리를 적용한 새로운 전원 공급장치가 국내에서 세계 최초로 제안되었다. 그러나 제안된 기술을 현장에 적용하기 위해서는 배터리 장치가 설치되는 랙 시스템의 내진 안전성이 요구된다. 본 연구에서는 세계 최초로 72시간 용량 확보를 위해 개발 된 리튬폴리머 배터리 장치를 대상으로 지진 발생 시 전원장치의 안전성을 확보하기 위해 설계 된 전원장치 스트링 및 랙 프레임에 대한 내진성능을 평가하고자 하였다. 실험 결과 1) 단위 랙 시스템의 공진대역은 9 Hz로서 지진하중 전 후의 고유진동수가 변하지 않음에 따라 설계지진하중에 대한 부재 및 부재간의 연결부에 대한 안전성을 확인할 수 있었다. 원전 설계기준 OBE와 SSE에서의 가속도 응답 결과 2) 스트링 제작에 의한 진동 저감 효과가 약 20%정도 보였으며, 3) OBE, SSE 조건에서의 내진시험 결과 랙 프레임 시스템은 설계지진에 대해 안전한 것으로 나타났다. 따라서 본 연구에서 제시한 랙 시스템은 요구 지진력에 대한 구조적 건전성이 입증되었으므로 원전 시설에 적용이 가능한 것으로 나타났다.

Keywords

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Fig. 1. Seismic Qualification Test of Lithium Polymer Battery Rack System

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Fig. 2. Lithium Polymer Battery System Component

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Fig. 3. Module Installation Type

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Fig. 4. Rack frame Design

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Fig. 5. Composition of equipment for Seismic Test

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Fig. 6. Seismic Test Setting

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Fig. 7. Resonance Test

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Fig. 8. Seismic(OBE, SSE) Test

Table 1. Using Damping Factor in Seismic Design

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Table 2. Equipment Specifications for Seismic Test

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Table 3. accelerometer

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Table 4. Resonance Frequency

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Table 5. OBE and SSE Test Result

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References

  1. H. J. Park, H. S. Kim, "Status of earthquake occurrence and seismic design criteria", Proceeding of Autumn Annual Conference of KHA, Vol.2, pp.405-406, 2018.
  2. S. H. Eem, I. K. Choi, "Sesmic Reponse Analysis of Nuclear Power Plant Structures and Equipment due to the Pohang Earthquake", Journal of the Earthquake Engineering Society of Korea, Vol.22 No.3, pp.113-119, Apr. 2018. DOI : https://doi.org/10.5000/EESK.2018.22.3.113
  3. NERP, Government of Japan, "Report of Japanese Government to the IAEA Ministerial Conference on Nuclear Safety - The Accident at TEPCO's Fukushima Nuclear Power Stations", 2011
  4. United States Nuclear Regulatory Commission, "Recomendation Enhancing Reactor Safety in the 21st Century", U.S.NRC, 2011
  5. W. R. Kim, C. K. Chang, "The Utilization of Energy Storage System(ESS) as Emergency Power Source for Nuclear Power Plant", Journal of Power System Research Association Summer Conference, The Korean Institute of Electrical Engineers, pp.641-642, Jul. 2015.
  6. G. H. Lee, J. M. Kim, S. Y. Kim, "Seismic Retrofitting of Cabinet Structures in Nuclear Power Plant", Journal of the Earthquake Engineering Society of Korea, Vol.7, No.4, pp.31-37, Aug. 2003. https://doi.org/10.5000/EESK.2003.7.4.031
  7. United States Nuclear Regulatory Commission, "Regulatory Guide 1.60: Design Response Spectra for Seismic Design of Nuclear Power Plants". U.S.NRC, c2014.
  8. ASCE/SEI 43-05, "Seismic design criteria for structures, systems, and components in nuclear facilities", ASCE/SEI, 2005.