Development of the site-specific uniform hazard spectra for Korean nuclear power plant sites

Choi, In-Kil; Nakajima, Masahiro; Choun, Young-Sun; Ohtori, Yasuki

doi:10.1016/j.nucengdes.2008.12.026

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…The main objective of this section is to discuss the results of the case study. To achieve the objective, an investigation is conducted on models of seismic sources in South Korea and it is made from a historical and instrumental earthquake catalog from Choi et al [55]. The Gunnam concrete gravity dam in South Korea is selected as the site by taking the latitude and longitude value (38.104 • N and 127.021 • E).…”

Section: Case Study and Discussionmentioning

confidence: 99%

RETRACTED: PSHRisk-Tool: A Python-Based Computational Tool for Developing Site Seismic Hazard Analysis and Failure Risk Assessment of Infrastructure

2020

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To quantify the annual probability of earthquake ground motion (GM) exceeding a given threshold, the extensively used method named by probabilistic seismic hazard analysis (PSHA) can be adopted. The PSHA software made this method more effortless for estimating earthquake hazards for a seismic site. The main motivation of the PSHRisk-tool is to evaluate the PSHA by a user-friendly graphical interface as well as identify the intensities of GM, which will contribute to the most vulnerable condition for the infrastructure. This python-code based tool can demonstrate the source identification, probability distribution plot of magnitude and distance, formulate the hazard curve according to almost all ground motion prediction equations (GMPEs). The deaggregation for each intensity measure (IM) and the effect of seismic parameters in each GMPE can also be determined. Alongside this, the combination of the failure frequency and the hazard analysis for identifying risk assessment separates this tool from the other existing PSHA software. Accurate verification with analytical and existing test models and a case study inspires its acceptance rate. However, with the quickest and easiest way users can determine the seismic hazard analysis for any location. Failure risk analysis can be evaluated simply based on the structural failure parameters.

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Section: Case Study and Discussionmentioning

confidence: 99%

RETRACTED: PSHRisk-Tool: A Python-Based Computational Tool for Developing Site Seismic Hazard Analysis and Failure Risk Assessment of Infrastructure

2020

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“…The proposed design of the EDG is based on a set of synthetic seismic input ground motions compatible with a uniform hazard spectra (UHS). Five three-dimensional ground motion sets are generated based on the UHS (10 −4 /year) for Uljin, South Korea with a PGA = 0.273 g [19,20]. Figure 1 shows the target pseudospectral acceleration for the horizontal and vertical directions with the individual ground motions shown in a lighter shade.…”

Section: Seismic Hazard and Expected Seismic Performancementioning

confidence: 99%

Enhanced Seismic Protection System for an Emergency Diesel Generator Unit

2022

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Nuclear power plants are required to maintain operation after an earthquake, leading to a safe shutdown if necessary. In the case of a loss of offsite power, the onsite emergency diesel generator is critical to ensure procedural operations of the nuclear power plant. As a means to reduce the overall seismic risk, a three-dimensional seismic protection system is proposed to enhance the seismic performance of the emergency diesel generator. The proposed seismic isolation system decouples the horizontal and vertical components of shaking and considers available hardware to achieve an effective isolation solution over the range of excitation frequencies considered. Numerical analysis of the proposed system demonstrates a reduction in seismic demands on the emergency diesel generator and provides a higher safety margin than conventional base installation procedures. Umbilical lines that cross the isolation plane are considered and impose additional constraints on the displacement capacity of the isolation system. However, increasing the displacement capacity of these components can significantly increase the safety margin against failure. The seismic protection system can be customized depending on the seismic hazard and application to different seismic regions.

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“…Here, for this target, the seismic load has been considering by determining the seismic hazard analysis of the specific site, where the risk is evaluated by the multiplication with the structural failure responses. The software PSHRisk-tool developed by the same authors of this manuscript has been used to evaluate the seismic hazard analysis of the specific sites (dam location) in Korea analyzed considered four seismic models [10].…”

Section: Background and Scopementioning

confidence: 99%

“…The site-specific magnitude is appropriate for use in seismic risk assessment because there are only a few strong motion data and seismological information for the dam sites in Korea. As a result, according to the Choi et al [10] for Korea, there are four seismic source models as shown in Figure 17 along with the dam site. More than 2000 earthquake records were used for making the seismic source models [66], and the magnitude-frequency relationship was presumed the same as the Gutenberg-Richter study [35].…”

Section: Site Seismic Hazard Analysismentioning

confidence: 99%

Effective Safety Assessment of Aged Concrete Gravity Dam based on the Reliability Index in a Seismically Induced Site

2021

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The seismic performance of the aged-concrete gravity dam (aged-CGD) by safety assessment based on the reliability-index is the main focal point of this study. Determination of reliability-index has been handled by the site seismic hazard analysis with the help of PSHRisk-tool (developed by the authors) and risk assessment. Incorporated with the uncertainties, the failure probability has been carried out by the IDA and fragility analysis. For the nonlinear finite element model of the CGD, the concrete damage plasticity (CDP) model is adopted. To investigate the aging effect, the hygro-chemo-mechanical model has been taken for different years consideration. Through the failure risk assessment of serviceability and safety level, the target reliability index has been determined here for an existing CGD in Korea. Despite several types of research on the CGD safety assessment, the main novelty of this proposed approach will help the dam operator to check the safety barrier for the aged-CGD. A safety index is investigated by comparing the target reliability-index of the age-CGD with the reliability-index for two potential earthquake levels. However, the proposed approach can implement to check the safety range of any seismic site for any set of earthquakes.

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Development of the site-specific uniform hazard spectra for Korean nuclear power plant sites

Cited by 14 publications

References 8 publications

RETRACTED: PSHRisk-Tool: A Python-Based Computational Tool for Developing Site Seismic Hazard Analysis and Failure Risk Assessment of Infrastructure

RETRACTED: PSHRisk-Tool: A Python-Based Computational Tool for Developing Site Seismic Hazard Analysis and Failure Risk Assessment of Infrastructure

Enhanced Seismic Protection System for an Emergency Diesel Generator Unit

Effective Safety Assessment of Aged Concrete Gravity Dam based on the Reliability Index in a Seismically Induced Site

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