• 전산구조공학
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• 제37권2호
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• pp.11-15
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• 2024

• Nuclear Engineering and Technology
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• 제54권4호
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• pp.1363-1373
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• 2022

The recent seismic events that occurred in South Korea have increased the interest in the re-evaluation of the seismic capacity of nuclear power plant (NPP) equipment, which is often conservatively estimated. To date, various approaches-including the Bayesian method proposed by the United States (US) Electric Power Research Institute -have been developed to quantify the seismic capacity of NPP equipment. Among these, the Bayesian approach has advantages in accounting for both prior knowledge and new information to update the probabilistic distribution of seismic capacity. However, data availability and region-specific issues exist in applying this Bayesian approach to Korean NPP equipment. Therefore, this paper proposes to construct an earthquake experience database by combining available earthquake records at Korean NPP sites and the general location of equipment within NPPs. Also, for the better representation of the seismic demand of Korean earthquake datasets, which have distinct seismic characteristics from those of the US at a high-frequency range, a broadband frequency range optimization is suggested. The proposed data construction and seismic demand optimization method for seismic capacity re-evaluation are demonstrated and tested on a 480 V motor control center of a South Korea NPP.

• 한국융합학회논문지
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• 제10권4호
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• pp.25-32
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• 2019

소방활동 관점에서 공동주택은 화재시 구조적 관리적 문제점을 가지고 있으므로 피난장애 발생 및 연소확대 위험성이 큰 것으로 조사되었다. 공동주택의 다양한 화재취약요인들을 분석한 결과, 안전시스템, 소방시설, 건축물 안전, 일반안전 분야로 평가분야를 도출하였으며 이에 따른 평가요소들을 제시하였다. 이와 함께, 6개의 국내외 공동주택 화재안전성능 인증제도 현황을 비교분석함에 따라 국내외 인증제도의 특성을 분석하였다. 결론적으로, 인증제도의 5개의 융합적 추진방향 및 4개 평가분야별 22개 평가항목들을 도출하였으며, 이를 기반으로 3개의 공동주택 화재안전성능 인증제도의 융합적 도입 방안을 수립하였다.

• 대한조선학회논문집
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• 제46권1호
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• pp.69-77
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• 2009

Loss of human lives and properties including environmental damage due to large scale accidents requires change of our perception to marine safety. IMO is trying to re-establish overall marine safety system through long term plan such as GBS. Along this line, current regulation based safety evaluation is in process of changing into performance based methods, and for this transition, simulation based safety evaluation during design stage considering damage is highly necessary. In this paper, first, damage scenario is developed from IMO regulations and accident case studies. Then an integrated and simulation based safety evaluation prototype system considering both damage stability and structural safety is developed for the use during ship design process.

• 한국구조물진단유지관리공학회 논문집
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• 제2권4호
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• pp.194-200
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• 1998

Risk, probability of failure, which includes various uncertainties and influential factors of performance should be accounted for in engineering system. Recently, several different methods to analysis risk evaluation evolved and one of the practical method is FOSM (First Order Second Moment Method ). FOSM method is derived in terms of terms coefficient of variance to uncertainties which influence various factor. For risk evaluation and uncertainty analysis in hydraulic design system, load-capacity relationship is adopted in this paper. Sample catchment with design of sewer system is applied, which plots safety factor vs. risk. Risk evaluation and uncertainty analysis are very to important develop optimal design model in hydraulic system

• 비파괴검사학회지
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• 제15권3호
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• pp.467-481
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• 1995

• 한국지진공학회논문집
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• 제25권3호
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• pp.129-135
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• 2021

After the manual shutdown of the Wolseong nuclear power plant due to an earthquake in Gyeongju in 2016, anxiety about the earthquake safety of nuclear power plants has become a major social issue. The shear wall structure used as a major structural element in nuclear power plants is widely used as a major structural member because of its high resistance to horizontal loads such as earthquakes. However, due to the complexity of the structure, it is challenging to predict the dynamic characteristics of the structure. In this study, a three-story shear wall structure is fabricated, and the in-structure response characteristics of the shear wall structure are evaluated through shaking table tests. The test is performed using the Gyeongju earthquake that occurred in 2016, and the response characteristics due to the domestic earthquake are evaluated.

• 한국가스학회지
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• 제13권1호
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• pp.40-44
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• 2009

LNG 저장탱크의 대형화 추세에 맞춰 대형화, 건설비용 등에 있어 상대적으로 유리한 강재 지붕형 LNG 저장탱크에 대한 구조안전성을 기존의 콘크리트 지붕형 저장탱크와 비교 평가하였다. 20만$k{\ell}$ 강재 지붕형 탱크와 콘크리트 지붕형 탱크에 대해서 정상운전상태, LNG 유출상태 및 지진하중상태의 주요 하중조합조건에서 유한요소해석기법을 이용하여 해석하고, 벽체, 바닥 및 지붕의 강도비를 통해서 구조안전성을 정량적으로 평가하였다.

• 한국기계가공학회지
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• 제18권4호
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• pp.1-9
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• 2019

Most product structural components are assembled by various members and castings except casting products. In such cases, a particular structure is required to move and fix each component. In particular, the safety uncertainty of heavy product assemblies can be linked to large accidents. Thus, the safety design and evaluation of additional structures have become more important. In the field and factories, these additional structures are called handling structures, which are designed and manufactured. As the types of products produced become more diverse, the design and manufacture of a handling structure are also diversified. The results of each evaluation should be derived. We develop a logical design and evaluation method, which was previously designed based on empirical data, for the handling structure.

• 해양환경안전학회지
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• 제26권3호
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• pp.277-285
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• 2020

Recently, studies have been actively conducted on seismic design and improvement of the seismic performance of bridges, buildings, factories, and plants. In particular, heavy items that are being manufactured or waiting to be shipped from factories (such as generators, engines, and boilers) must be equipped with seismic stoppers to prevent them from moving or falling during an earthquake. Seismic stoppers should be suitably determined by the size and weight of these heavy items; however, they have no general design standard. In this study, structural analyses and seismic tests were conducted to evaluate the performance of newly designed seismic stoppers. Structural analysis was performed on three stopper models to estimate the external load at which the yield stress of the material was not exceeded. Based on the analysis results, a seismic test of the stopper was carried out in accordance with the AC156 test method. Finally, product specifications for all three seismic stopper models were determined and their static/dynamic load performance was evaluated.