Damage development analysis of the whole nuclear power plant of AP1000 type under strong Main-aftershock sequences

•Focus on the seismic damage of the whole NPP during strong seismic sequences.•Investigation on the influence of the dynamic responses of the RCAB.•Analysis of the stress concentration interaction damage development.•Discussion the damage mechanical energy dissipation of the AP1000 NPP. This paper f...

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Bibliographic Details
Published in:Nuclear engineering and design 2021-01, Vol.371, p.110975, Article 110975
Main Authors: Chen, Wanruo, Zhang, Yongshan, Wang, Dayang
Format: Article
Language:English
Subjects:
Aftershocks
Compression
Concrete
Concrete construction
Damage assessment
Damage state
Earthquake damage
Earthquakes
Main-aftershock earthquake
Nonlinear behavior
NPP of AP1000 type
Nuclear energy
Nuclear power plants
Reinforced concrete
Seismic activity
Simulation
Three dimensional models
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Summary:•Focus on the seismic damage of the whole NPP during strong seismic sequences.•Investigation on the influence of the dynamic responses of the RCAB.•Analysis of the stress concentration interaction damage development.•Discussion the damage mechanical energy dissipation of the AP1000 NPP. This paper focuses on the seismic damage analysis of the whole nuclear power plant (NPP) of AP1000 type during strong seismic sequences. For that purpose, seven synthetic main-aftershocks with three-direction inputs are considered in this study, and the three-dimensional model of whole NPP of AP1000 type suffering from the selected seismic sequences is established. The results indicate that (i) the damage aggravation effect is substantially caused by considering the reinforced concrete auxiliary building (RCAB) for the NPP and is mainly concentrated at the upper intersection between the reinforced concrete shield building (RCSB) and RCAB, especially during beyond design basis earthquake sequences, (ii) concrete damage are greatly developed with increasing PGA, and aggravated by the aftershock, concrete tension damage is more severe than compression damage under earthquake sequences, (iii) the structure residual displacement in three directions are increased by the aftershock, (iv) the average value of the sequence seismic damage dissipation energy is 1.14–1.27 times that of a single earthquake, and the increasing trend of the times is linear.
ISSN:0029-5493
1872-759X
DOI:10.1016/j.nucengdes.2020.110975