A Simple Approach to Calculate CDF with Non-rare Events in Seismic PSA Model of Korean Nuclear Power Plants 


Vol. 36,  No. 5, pp. 86-91, Oct.  2021
10.14346/JKOSOS.2021.36.5.86


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  Abstract

Calculating the scrutable core damage frequency (CDF) of nuclear power plants is an important component of the seismic probabilistic safety assessment (SPSA). In this work, a simple approach is developed to calculate CDF from minimal cut sets (MCSs) with non-rare events. When conventional calculation methods based on rare event approximations are employed, the CDF of industry SPSA models is significantly overestimated by non-rare events in the MCSs. Recently, quantification algorithms using binary decision diagrams (BDDs) have been introduced to prevent CDF overestimation in the SPSA. However, BDD structures are generated from a small part of whole MCSs due to limited computational memory, and they cannot be reviewed due to their complicated logic structure. This study suggests a simple approach for scrutinizing the CDF calculation based on whole MCSs in the SPSA system analysis model. The proposed approach compares the new results to outputs from existing algorithms, which helps in avoiding CDF overestimation.

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  Cite this article

[IEEE Style]

임학규, "A Simple Approach to Calculate CDF with Non-rare Events in Seismic PSA Model of Korean Nuclear Power Plants," Journal of the Korean Society of Safety, vol. 36, no. 5, pp. 86-91, 2021. DOI: 10.14346/JKOSOS.2021.36.5.86.

[ACM Style]

임학규. 2021. A Simple Approach to Calculate CDF with Non-rare Events in Seismic PSA Model of Korean Nuclear Power Plants. Journal of the Korean Society of Safety, 36, 5, (2021), 86-91. DOI: 10.14346/JKOSOS.2021.36.5.86.

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