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

기기면진 기반 원전 내진성능 상향 타당성 검토

  • Received : 2018.10.31
  • Accepted : 2018.12.21
  • Published : 2018.12.30


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.


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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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Supported by : 한국에너지기술평가원(KETEP)


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