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기기면진 기반 원전 내진성능 상향 타당성 검토

Feasibility Study for Seismic Performance Enhancement of NPP Based on Equipment Base Isolation

  • 투고 : 2018.10.31
  • 심사 : 2018.12.21
  • 발행 : 2018.12.30

초록

In this study, to enhance the seismic performance of nuclear power plants (NPP), a small laminated rubber bearing (LRB) is chosen as a seismic design option of the vulnerable equipment. Prior to the application of equipment base isolation, it is necessary to review the feasibility that the technique contributes enough to the seismic performance of NPP by analysis. At first, some preliminary design of small LRBs for equipment is carried out. Design parameters such as horizontal and vertical stiffnesses, design natural frequencies are checked by calculation and analysis for the four design options considering various upper weights. Performance test of small LRB is to be carried out to verify static performance using the results.

키워드

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Fig. 1 Base-isolation Effect

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Fig. 2 Cross Section and Name for Each Part of LRB

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Fig. 3 ANSYS Model of 1ton LRB

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Fig. 4 Horizontal and Vertical Mode Shape of 1ton LRB

Table 1. Comparison of Seismic Isolator(8)

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Table 2. Design Specification of LRB

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Table 3. Rubber Material Properties

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Table 4. Design Value Calculation for 1ton LRB(10-12)

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Table 5. Natural Frequency Calculation Result

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Table 6. ANSYS Modal Analysis Result

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Table 7. Error in Analysis Compared to Calculation

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과제정보

연구 과제 주관 기관 : 한국에너지기술평가원(KETEP)

참고문헌

  1. US NRC, 2011, "Technical Considerations for Seismic Isolation of Nuclear Facility Structures", Washington, DC, Enclosure 3.
  2. Jang, K. S., Chang, C. H. and Lee, H. P., 2016, "Influence Evaluation of the Multi-Lead Rubber Bearing due to the Compressive Stress for Nuclear Power Plant", J. Korean Soc. Adv. Comp. Struc., Vol. 7, No. 3, pp. 55-64. https://doi.org/10.11004/kosacs.2016.7.3.055
  3. JNES, 2010, "Regulatory Guideline for Reviewing Seismic Isolation Structures", Tokyo, JNES-SS-1001.
  4. JNES, 2013, "Proposal of Technical Review Guidelines for Structures with Seismic Isolation", Tokyo, JNES-RC-2013-1002.
  5. IAEA, 2013, "Technical Report on Seismic Isolation Systems for Nuclear Installations", Wein, Draft Ver.2.0.
  6. KINS, 2012, "A Fundamental Study on the Development of Regulatory Technology for a Seismic Isolation System of Nuclear Power Plant Structures", Daejeon, KINS/HR-1227, Vol. 1.
  7. KINS, 2014, "A Fundamental Study on the Development of Regulatory Technology for a Seismic Isolation System of Nuclear Power Plant Structures II", Daejeon, KINS/HR-1227, Vol. 2.
  8. Moussallam, N., Allain, F., Petre-Lazar, I., Conneson, M., Diaz, S., Vu, T., Bouteleux, S., Soupel, B., Labbe, P. and Thiry, J., 2013, "Seismic Isolation of Nuclear Structures-Overview of the French Practice and Experience," Trans. of SMiRT-22, San Francisco, California, USA, Aug. 18-23.
  9. Kim, M. K., Choun, Y. S. and Choi, I. K., 2004, "A Shaking Table Test for Equipment Isolation in the NPP (I): Rubber Bearing", J. of the EESK., Vol. 8, No. 5, pp. 65-77.
  10. Koo, G. H. and Shin, T. M., 2018, "Design of Small Size Laminated Rubber Bearings Applicable for Seismic Isolation of Individual Nuclear Components," Trans. of the KNS, Jeju, Korea, May 17-19.
  11. Lee, J. H., Shin, T. M. and Koo, G. H., 2018, "A Study on the Design Value of Small Laminated Rubber Bearings for Seismic Isolation of Nuclear Power Plant Equipment," Trans. of the KNS, Yeosu, Korea, Oct. 25-26.
  12. Koo, G. H., Lee, J. H. and Yoo, B., 1997, "Mechanical Characteristics of Laminated Rubber Bearings for Seismic Isolation," J. of the EESK, Vol. 1, No. 2, pp.1-10.