Results 1 to 10 of about 530 (190)

Impact of representative ground motion level on seismic PSA with the boundary between overestimation and underestimation

Nuclear Engineering and Technology
One commonly used approach to seismic probabilistic safety assessment (PSA) is the discrete method, which follows the conventional PSA framework and can be applied to various different model types (e.g., multi-unit models).
Jisuk Kim, Man Cheol Kim
exaly   +5 more sources

A new methodology for modeling explicit seismic common cause failures for seismic multi-unit probabilistic safety assessment

Nuclear Engineering and Technology, 2020
In a seismic PSA, dependency among seismic failures of components has not been explicitly modeled in the fault tree or event tree. This dependency is separately identified and assigned with numbers that range from zero to unity that reflect the level of ...
Woo Sik Jung
exaly   +4 more sources

A hybrid approach of partially applying BDD for seismic PSA quantification

Nuclear Engineering and Technology
The binary decision diagram (BDD) method provides a means to calculate the exact probability of a fault tree, but cannot solve large fault trees for nuclear power plant PSAs.
Sang Hoon Han
exaly   +4 more sources

A Method to Avoid Underestimated Risks in Seismic SUPSA and MUPSA for Nuclear Power Plants Caused by Partitioning Events

Energies, 2021
Seismic probabilistic safety assessment (PSA) models for nuclear power plants (NPPs) have many non-rare events whose failure probabilities are proportional to the seismic ground acceleration.
Woo Sik Jung
doaj   +2 more sources

Sensitivity Study on the Correlation Level of Seismic Failures in Seismic Probabilistic Safety Assessments

Energies, 2021
It is popular that correlated seismic failures spread over the fault tree of a seismic probabilistic safety assessment (PSA) for a nuclear power plant (NPP).
Geon Gyu Choi, Woo Sik Jung, Seong Kyu Park   +2 more
doaj   +2 more sources

Development of a Software Tool for Seismic Probabilistic Safety Assessment Quantification with a Sufficiently Large Number of Bins for Enhanced Accuracy

Energies, 2021
Quantification in seismic probabilistic safety assessment (PSA) includes the convolution of hazard and fragility curves. Because it is difficult to find the closed-form integration for the convolution of two curves, numerical methods are widely used in ...
Ji Suk Kim, Man Cheol Kim
doaj   +2 more sources

From the risk integral to seismic PSA models. Practice and limitation of seismic risk assessment

Energy Procedia, 2017
Abstract Safety assessment for nuclear power stations estimates the risk of radioactive release into the environment. Earthquakes could lead to a release of radioactivity so they should be considered during safety assessment. Seismic probabilistic safety assessment (PSA) is divided in three main section: hazard assessment, fragility analysis and ...
exaly   +2 more sources

Insights gained from applying negate-down during quantification for seismic probabilistic safety assessment

Nuclear Engineering and Technology, 2022
Approximations such as the delete-term approximation, rare event approximation, and minimal cutset upper bound (MCUB) need to be prudently applied for the quantification of a seismic probabilistic safety assessment (PSA) model.
Ji Suk Kim, Man Cheol Kim
doaj   +1 more source

The effect of the number of subintervals upon the quantification of the seismic probabilistic safety assessment of a nuclear power plant

Nuclear Engineering and Technology, 2023
Seismic risk has received increased attention since the 2011 Fukushima accident in Japan. The seismic risk of a nuclear power plant is evaluated via seismic probabilistic safety assessment (PSA), for which several methods are available.
Ji Suk Kim, Man Cheol Kim
doaj   +1 more source

Methodology of seismic-response-correlation-coefficient calculation for seismic probabilistic safety assessment of multi-unit nuclear power plants

Nuclear Engineering and Technology, 2021
In 2011, an earthquake and subsequent tsunami hit the Fukushima Daiichi Nuclear Power Plant, causing simultaneous accidents in several reactors. This accident shows us that if there are several reactors on site, the seismic risk to multiple units is ...
Seunghyun Eem, In-Kil Choi, Beomjoo Yang, Shinyoung Kwag   +3 more
doaj   +1 more source