• Title/Summary/Keyword: seismic noise

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Seismic Analysis of the Main Control Boards for Nuclear Power Plant (원자력발전소의 Main Control Boards에 대한 내진 해석)

  • Byeon, Hoon-Seok;Lee, Joon-Keun;Kim, Jin-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11a
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    • pp.498-498
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    • 2001
  • Seismic qualification of the Main Control Boards for nuclear power plants has been performed with the guideline of AS ME Section III. US NRC Reg. Guide and IEEE 344 code. The analysis model of the Main Control Boards is consist of beam. shell and mass element by using the finite element method. and, at the same time. the excitation forces and other operating loads for each model are encompassed with respect to different loading conditions. As the fundamental frequencies of the structure are found to be less than 33Hz. which is the upper frequency limit of the seismic load, the response spectrum analysis using ANSYS is performed in order to combine the modal stresses within the frequency limit. In order to confirm the structural and functional integrity of the major components, modal analysis theory is adopted to derive the required response spectrum at the component locations. As all the combined stresses obtained from the above procedures are less than allowable stresses and no mechanical or electrical failures are found from the seismic testing, it concludes the Main Control Boards is dynamically qualified for seismic conditions. Although the authors had confirmed the structural and functional integrity of both Main Control Boards and all the component, in this paper only the seismic analysis of the Main Control Board is introduced.

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Seismic Analysis on a Control Panel of (Nuclear) Power Plant (발전소 주 제어실 제어패널의 내진해석)

  • Lee, Heung-Shik;Kim, Myung-Gu;Cho, Chongdu
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.6 s.99
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    • pp.652-659
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    • 2005
  • In this paper, seismic qualification analysis for the Plant control Panel is carried out to confirm the structural integrity under the seismic conditions represented by required response spectra(RRS). The finite element method(FEM) is used for the analysis and a mode combination method is adopted to obtain a more reliable spectrum analysis results. In addition, the experimental analysis is performed to compare the reliability of the analytical results. The analysis results shows that the plant control panel system is designed to have the dynamic rigidity with no resonance frequency below 33 Hz. The analytically calculated maximum stress of the plant control panel system is $36\%$ of the field strength of material, thus it can be shown that the system has a stable structure for the seismic load.

Evaluation of Seismic Responses of Isolated Bridges Considering the Flexibility of Piers (교각의 강성을 고려한 지진격리교량의 응답특성 평가)

  • Seo, Hyun-Woo;Kim, Nam-Sik;Cheung, Jin-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.662-665
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    • 2004
  • In this paper, based on shaking table test results on a seismically isolated bridge model, an inelastic numerical model is refined by using Bouc-Wen model representing the hysteretic behavior of isolators. Seismic responses of isolated bridges are numerically investigated varying with relative stiffness ratios, which is a ratio of the effective stiffness of isolator to the lateral stiffness of bridge pier. From the results, it is found that an adequate range of relative stiffness ratio could be defined for seismic design of isolated bridges without considering the flexibility of piers.

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Seismic Drop Performance for Second Shutdown Drive Mechanism Installed in Research Reactor (연구용 원자로 내부에 설치되는 이차정지구동장치의 내진낙하성능)

  • Kim, Sanghaun;Kim, Gyeong-Ho;Sun, Jongoh;Cho, Yeong-Garp;Kim, Jung-Hyun;Jung, Taeck-Hyung;Lee, Kwan-Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.6_spc
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    • pp.697-704
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    • 2016
  • The second shutdown drive mechanism (SSDM) that is classified into seismic category I as an active mechanical equipment shall maintain the structural integrity and its designed inherent safety functions during and/or after normal operation, anticipated operational occurrences, accidents and seismic occurrences. Therefore, not only a structural integrity assessment through numerical analyses but also a qualification test by using the prototype SSDM shall be conducted to verify the adequacy of the SSDM design. This paper describes a sort of seismic qualification test of the prototype SSDM to demonstrate that the structural integrity and operability (functionality) of SSDM are maintained during and/or after seismic excitations. From the results, this paper shows that the SSDM satisfies all design requirements without any malfunctions during and after the seismic test.

Seismic Response Analysis of Multi-story Structures by the Transfer Stiffness Coefficient Method (전달강성계수법에 의한 다층구조물의 지진응답해석)

  • 문덕홍;강현석;최명수;김성진
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.05a
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    • pp.793-798
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    • 2001
  • This paper is basic study of seismic response analysis for the large scaled structures subjected to seismic loading. The authors propose seismic response analysis algorithm for the multi-story structures, which are subjected to ground acceleration. This analysis method is derived from an combination of the transfer stiffness coefficient method(TSCM) and Newmark method. Numerical computation is performed for simple multi-story structures acting on an arbitrary ground acceleration. Numerical results by the TSCM which is applied to the various strong ground motion are compared with results by central difference method and Runge- Kutta method.

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A Seismic Analysis for Driving Gear Reducer of ESW Traveling Sea Water Screen (ESW형 해수여과장치의 구동 기어감속기에 대한 내진해석)

  • Kim, Chang-Won;Lee, Young-Shin;Kim, Heung-Tae;Kim, Jee-Won
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.7
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    • pp.599-604
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    • 2012
  • In this study, the safety of the driving gear reducer of ESW(essential service water) traveling sea water screen was evaluated through seismic analysis. Mode analysis of gear reducer was performed for reliability of analysis. Seismic analysis was performed in operating basis earthquake(OBE) and safe shutdown earthquake(SSE), which were applied as design condition using floor response spectrum( FRS). The maximum strain of gear reducer under OBE and SSE were 20.4 ${\mu}$ and 33.6 ${\mu}$, respectively. The maximum stresses were 2.42 MPa under OBE condition and 4.36 MPa under SSE condition, which were smaller than the allowable strength of material.

Seismic Analysis for Driving Gear Reducer of ESW Traveling Sea Water Screen (ESW형 해수여과장치의 구동 기어감속기에 대한 내진해석)

  • Kim, Chang-Won;Lee, Young-Shin;Kim, Heung-Tae;Kim, Jee-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.731-736
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    • 2011
  • In this study, the safety of the driving gear reducer of ESW traveling sea water screen was evaluated through seismic analysis. Mode analysis of gear reducer was performed for reliability of analysis. Seismic analysis was performed in Operating Basis Earthquake(OBE) and Safe Shutdown Earthquake(SSE), which was applied as design condition using Floor Respnse Spectrum(FRS). The maxsimum displacement of gear reducer under OBE and SSE were 0.0137 mm and 0.0241 mm, respectively. The maximum stress of gear reducer under OBE and SSE were 2.42 MPa and 4.36 MPa, respectively.

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Seismic Analysis of Power Plant Piping System (발전소 배관계의 내진해석)

  • Kim, Jeong-Hyun;Lee, Young-Shin;Kim, Yeon-Whan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.480-485
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    • 2011
  • In this study, the seismic analysis of power plant piping system was performed using finite element model. This study was performed by ANSYS 12.1. For qualification of power plant piping system, the response spectrum analysis was performed using the given operating basis earthquake(OBE) and safe shutdown earthquake(SSE) floor response spectrum. The maximum stresses of power plant piping system were 166 MPa under OBE condition and 281 MPa under SSE condition. Thus, it can shown that the structural integrity of tpower plant piping system has a stable structure for seismic load conditions.

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A Seismic Analysis of Spent Fuel Handling Tool (사용후 핵연료 취급장비의 내진해석)

  • 김성종;이영신;김재훈;김남균
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.05a
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    • pp.1210-1215
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    • 2002
  • The spent fuel handling tool is used to handle the refuel bundle and treated by hoist rope on the bridge crane. The new developed handling tool of NPP(Nuclear Power Plant) should be conformed the structural stability under earthquake condition. In this study, the stress and seismic analysis of the handling tool are performed by finite element method. Using the Floor Response Spectrum(FRS) obtained through the time history analysis, the modal and seismic analysis under Operating Basis Earthquake(OBE) and Safe Shutdown Earthquake(SSE) load conditions are carried out. Total 4 cases of different locations of the trolly and the hook are investigated. With the spring-damper element, the tension analysis of hoist rope is conducted. The stability of handling tool under earthquake load condition is conformed with regulatory guide.

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Seismic Analysis of an Axial Blower Using a Commercial FEM Code (상용 유한요소해석 프로그램을 이용한 축류송풍기의 내진해석)

  • 정진태;임형빈;김강성;허진욱
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.12 no.3
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    • pp.181-186
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    • 2002
  • A seismic analysis is one of crucial design procedures of an axial blower used in nuclear power Plants. The blower should be operated even in ar emergency such as an earthquake. The blower should be designed in order to stand against an earthquake. For the seismic analysis, Ive perform the modal analysis and then evaluate the required response spectrum (PRS) from the given floor response spectrum (FRS). A finite element model of the blower is established by using a commercial FEM code of ANSYS. After the finite element modeling. the natural frequencies. the mode shapes and the participation factors are obtained from the modal analysis. The PRS is acquired by a numerical approach on the basis of the principle of mode superposition. We verify the structura safety of the axial blower and confirm the validity of the present seismic analysis results.