Fragility and Leakage Risk Assessment of Nuclear Containment Structure under Loss-of-Coolant Accident Conditions Considering Liner Corrosion

The steel liner plays a key role in ensuring the leak-tightness of nuclear containment structures (NCSs). Once the liner is subjected to corrosion, its corrosion effects can severely impact the leak-tight function of the NCS, especially in severe accident scenarios. Therefore, evaluating the corrosi...

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Bibliographic Details
Published in:Applied sciences 2024-03, Vol.14 (6), p.2407
Main Authors: Li, Xinbo, Gong, Jinxin
Format: Article
Language:English
Subjects:
Aging
Climate change
Concrete
Corrosion
fragility
Investigations
leakage risk
liner corrosion
LOCA
Nuclear accidents
nuclear containment structures
Nuclear energy
Nuclear engineering
Nuclear power plants
pressure capacity
Prestressed concrete
Risk assessment
Simulation
Simulation methods
Steel
Temperature effects
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Summary:The steel liner plays a key role in ensuring the leak-tightness of nuclear containment structures (NCSs). Once the liner is subjected to corrosion, its corrosion effects can severely impact the leak-tight function of the NCS, especially in severe accident scenarios. Therefore, evaluating the corrosion effects of the liner is essential to guaranteeing the safe operation of nuclear power plants. This paper presents a probabilistic safety analysis of the NCS under liner corrosion conditions. Firstly, the corrosion mechanism of the liner is elucidated, and a refined simulation method is developed to investigate the localized corrosion effects of the liner. Utilizing a probabilistic finite element method, the fragility of the NCS under loss-of-coolant accident (LOCA) conditions is evaluated. Finally, the leakage risk of the NCS at different degrees of liner corrosion is discussed. The results indicate that liner corrosion has a significant impact on the median pressure capacity and high-confidence–low-probability pressure capacity of the NCS. With the aggravation of liner corrosion, the safety margin of the NCS decreases, and the total probability of failure increases. Within the scope of this paper, the NCS can fulfill the probabilistic safety requirements.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14062407