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Vol.11 No.1previous AASP19(150-151-152-153-154-155)-AA156 NT93
Academic Articles
Regular Paper Vol.11 No.1 (2019) p.8 - p.15
 

Development of Reliability Assessment Model for Seismic Loading that considers Fatigue Damage

 

Masayuki KAMAYA1,* and Takao NAKAMURA2
 
1 Institute of Nuclear Safety System, Inc., 64 Sata, Mihama-cho, Fukui 919-1205, Japan
2 Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
 
Abstract
Failure probability of static components is used for assessing plant safety or resilience index of nuclear power plants. In this study, a failure probability assessment model was developed that considers the effect of material degradation caused by low-cycle fatigue. Crack initiation due to fatigue damage was assumed and its depth was determined from the magnitude of fatigue damage. Then, crack growth was predicted for seismic loads consisting of a main earthquake and aftershocks. Finally, the failure probability was calculated for the seismic load of various magnitudes. The model was successfully applied to a pipe of the residual heat removal system of a pressurized water reactor power plant. It was shown that the failure probability was hardly affected by the degree of fatigue damage. Although the crack depth had little influence on the fracture strength of the cracked pipe, an increase in the number of aftershocks could increase the probability of leakage.
 
Keywords
low-cycle fatigue, crack growth, usage factor (UF), reliability analysis, static components
 
Full Paper: PDF EJAM Vol. 11 No. 1 pp.8-15 "Development of Reliability Assessment Model for Seismic Loading that considers Fatigue Damage"

Article Information
Article history:
Received 22 October 2018
Accepted 9 May 2019