• Title/Summary/Keyword: 원전 구조물

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Development of Risk Breakdown Structure of Nuclear Power Plant Decommissioning Project: Focusing on Structural Damage / Work Process Risks (원전 차폐 콘크리트 구조물 제염해체공사 리스크 분류체계 구축: 구조적 / 작업 리스크를 중심으로)

  • Kim, Byeol;Lee, Joo-Sung;Ahn, Yong-Han
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.3
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    • pp.38-45
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    • 2018
  • The purpose of this study is to deduct the structural damage / work process risks factors which can be occurred during the decommissioning in the NPP containment concrete structure. To achieve these purpose, risk profile specified in the construction industry is analyzed, and the work process of NPP decommissioning and the construction project were matched based on the similarity of each works. Accordingly, human and physical risk factors are classified. Finally, the risk associated with the building structure and work process was classified as per their process activities, and risk typology explaining the disaster which put the structure, equipments, machine and workers in serious danger was developed.

Chloride Penetration Analysis of Fly Ash Concrete using Potentiometric Titration and XRF (플라이애시를 혼입한 콘크리트의 전위차 적정법과 XRF를 이용한 염화물 침투 분석 )

  • Eun-A Seo;Ji-Hyun Kim;Ho-Jae Lee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.27 no.5
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    • pp.16-22
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    • 2023
  • In this study, a salt water immersion test was performed on concrete specimens simulating the concrete mix design of the nuclear power plant, and the correlation between the amount of chloride and the XRF component according to the depth of the concrete was analyzed. The amount of chloride on the surface of the nuclear power plant concrete increased slightly with increasing immersion time in salt water, but the amount of chloride in the depth of 5.5 mm or more showed a clear tendency to increase with increasing immersion time in salt water. As a result of analyzing the correlation between the amount of chloride in concrete and the XRF component, the concrete with 20% FA substitution compared with the OPC concrete showed a very high correlation between the composition ratio of Cl ions and the evaluation result of salt damage resistance by XRF component analysis. Accordingly, it was confirmed that chlorine ion analysis and salt damage resistance performance evaluation by XRF component analysis were possible through repeated data accumulation in the nuclear power plant concrete mix with 20% fly ash replacement.

Evaluation and Application of Dynamic Soil Properties for SSI Analysis (지반-구조물 상호작용해석시 동적지반특성의 평가 및 적용)

  • Lee, Myung Jae;Shin, Jong Ho;Chon, Chun Su
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.10 no.2
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    • pp.103-112
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    • 1990
  • This study examines the characteristics of soil behavior which includes many uncertainties in seismic design, evaluates the dynamic soil properties and studies the soil-structure interaction to generalize the applicability and economy of the available sites. An example analysis is performed for soil-structure system response assuming a containment structure built on site which includes soil layers using both elastic halfspace analysis and FEM analysis against the seismic loads from the actual design. This exercise is performed as a part of the safety analysis and economic assessment of the nuclear power plant built on soils. It includes the preparation of computer program capable of incorporating large nonlinearity in the analysis, resonable evaluation procedures to determine input soil data. Nonlinear FEM analysis of Seed and Idriss model is found suitable for the accurate analysis of dynamic response of soils. Linear FEM analysis using dynamic soil properties at strain level obtained by one-dimensional seismic response, and elastic half-space analysis using dynamic soil properties at strain level under static loads are recommended to evaluate the dynamic soil properties.

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Buckling of Power-Plant Containment Liner Plate Structure during Lifting (원전 격납철판 구조물의 양중시 좌굴 특성)

  • Yang, Seong-Yeong;Lee, Jong-Sup;Lee, Sang-Bong
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2011.04a
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    • pp.336-339
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    • 2011
  • 본 논문에서는 유한요소 프로그램 (ANSYS)을 이용하여 돔격납철판 (dome containment liner plate)의 양중시 좌굴특성의 연구를 수행하였다. 원전 격납철판의 양중시, 양중 와이어(wire)의 구조적인 배치특성상 격납철판에 압축력이 유발되고, 이러한 압축력은 격납철판의 좌굴을 일으킬 수 있다. 다양한 양중인자 (lifting factors)를 고려한 격납철판 유한요소모델을 수립하고, 이러한 양중인자들의 좌굴특성에 미치는 영향을 고찰하였다. 양중 와이어의 체결위치의 높이가 낮을 수록 좌굴강도가 증가하며, 라이너 플레이트 두께에 비례하여 좌굴강도가 증가하였다.

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Evaluation of Structural Behavior of SC Walls in Nuclear Power Plant with Openings (개구부를 갖는 원전 SC구조 벽체의 구조거동 평가)

  • Chung, Chul-Hun;Lee, Han-Joo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.5A
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    • pp.277-287
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    • 2012
  • The shear wall with openings built with reinforced concrete (RC) have been elaborately studied by many researchers, whereas the steel plate concrete (SC) wall structure has not been investigated as much. The recent SC wall structures developed in Korea have been partly applied to nuclear power plant structures, although its design specification or guideline for the SC wall structure with openings has not been completed yet. This study based on numerical analysis evaluates the effects of opening on the structural resistance of the SC structure in nuclear power plant. As a result from nonlinear analysis, since the strengthening for openings significantly affect the overall strength of SC wall, the openings should be considered to strengthen them around adjacent area. It is also proved that the strengthened openings have the sufficient resistance and ductility regardless their size, shape, location, and quantity.

Seismic Response of Seismically-Isolated Nuclear Power Plants considering Age-related Degradation of High Damping Rubber Bearing (고감쇠고무 적층받침의 경년열화를 고려한 원전구조물의 지진응답)

  • Park, Junhee;Choun, Young-Sun;Choi, In-Kil
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.2
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    • pp.131-138
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    • 2013
  • The high damping rubber bearings contributed to reduce a seismic force transmitted to upper structures, the material properties of rubber changes with time and the rubber with age-related degradation can affect the seismic response of structures and equipments. Therefore the seismic response of structure considering age-related degradation of isolators should be evaluated. In this paper, the stiffness and damping for isolators were defined using the aging data proposed by other researchers. The reactor containment building and the auxiliary building were selected to conduct the nonlinear analysis and the natural frequency, maximum responses, floor response spectrum(FRS) were evaluated with time using the four earthquakes with different frequency contents. According to the analysis results, the seismic responses are increased by the age-related degradation of isolators and the detail inspections should be conducted up to 20 years because it was presented that the change of FRS was high during this period.

A Numerical Study on the Effectiveness of a Floating Breakwater in Wonjeon Port (부방파제를 이용한 원전항의 정온효과 수치해석)

  • Lee Jeong-Lyul;Song Museok
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.8 no.1
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    • pp.23-30
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    • 2005
  • A numerical scheme is proposed which is applicable to the evaluation of wave field containing floating structures, and the method is utilized to estimate the effect of the floating breakwaters to be installed in Wonjeon port near Masan. The model is based on the mild-slope equation which is widely accepted for the calculation of wave modulation near shores and an additional term is introduced to consider the wave scattering associated with the thin floating structures such as floating breakwaters. The tranquility in Wonjeon port with the floating breakwater in the east side is calculated and compared with the one with a bottom-fixed breakwater. The present method is believed to provide an efficient way of quantitative measurement of the performance of floating breakwaters.

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The Study on Seismic Stability Evaluation Model for Rock Foundation of Nuclear Power Plant (원전 기초지반의 지진안정성 평가 모델 연구)

  • Hwang, Seong-Chun;Jang, Jung-Bum
    • Journal of the Earthquake Engineering Society of Korea
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    • v.9 no.4 s.44
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    • pp.1-10
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    • 2005
  • The purpose ol this study Is to suggest a proper analysis model that can evaluate seismic stability for local rock foundation of nuclear power plant. Sliding Analysis, Pseudo-static Analysis and Dynamic Analysis methods are used for analysing NPP rock foundation with the conditions like acting directions of input earthquake, boundary conditions, width and depth of analysing model, and modeling methods of weakness fault zones. As the results of study, Pseudo-static Analysis for lateral roller and dynamic analysis for transfer boundary condition showed good results, and analysing ranges of width and depth were 5 times of structure width and over 2 times ol structure depth.

영광 원전 3,4호기용 콘크리트를 이용한 MCCI 현상의 실험적 연구

  • Shin, Ki-Yeol;Jeong, Mo;Kim, Sang-Baek;Kim, Jong-Hwan;Cho, Young-Ro
    • Proceedings of the Korean Nuclear Society Conference
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    • 1997.10a
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    • pp.778-783
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    • 1997
  • 원자력 발전소에서의 중대사고시, 고온의 노심 용융물이 원자로 공동으로 떨어지면 노심용융물과 콘크리트간의 반응(MCCI)에 의한 여러가지 현상으로 인해 격납용기의 건전성을 위협할 수 있다. 본 연구에서는 국내 영광원전 3, 4호기에 사용된 공동구조물 콘크리트와 고온용융물간의 반응특성을 실험적으로 살펴보았다. 실험은 유도가열로를 이용한 1차원 장기침식을 모사하기 위한 MEK-S1 실험이다. 실험에서는 유도로의 전원부족으로 용융풀을 형성하지 못하여 장기침식에는 실패하였다. 하지만 약 150$0^{\circ}C$의 고온 SUS 304에 의한 콘크리트의 침식을 확인할 수 있었다. 실험후 분해한 콘크리트 반응시편의 단면은 침식으로 인해 매우 불규칙한 모양을 나타내었으며, 최대침식 깊이는 24mm로 나타났다. 실험중에 발생한 가스의 성분분석 결과에서 H$_2$, $CO_2$, CO 및 $O_2$, $N_2$등의 가스가 발생된 것을 알 수 있었다.

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