Effect of steel liner corrosion on the sealing performance of containment
The risk assessment of the containment with a corroded steel liner is of great significance to ensure nuclear safety.Before carrying out risk assessment,it is necessary to study the performance of the corroded steel liner and its effect on the sealing performance of containment.Combined with typical steel liner corrosion cases of containment at home and abroad,the corrosion characteristics and mechanism of steel liners are discussed.Related researches on the mechanical properties of the corroded steel liner are introduced,and experiments are conducted to explore the deficiencies of the researches.Research results on the sealing performance of containment with corroded steel liner are introduced,and the problems in the simulation of corroded steel liner are analyzed.Based on the test results,a simulation method for corroded steel liners is proposed and compared with foreign methods.The results show that avoiding debris left in the concrete during containment construction and keeping the coating intact are the most effective ways to prevent steel liner corrosion.When the corrosion rate is less than 50％,the elastic modulus of the steel liner is basically not affected by corrosion,but the yield strength,ultimate tensile strength and ultimate tensile strain decrease approximately linearly with the increase in the corrosion rate.Steel liner corrosion will increase the risk of leakage of containment under accident conditions.Foreign steel liner corrosion simulation methods overestimate the strain and internal pressure when the steel liner is torn under severe corrosion conditions.It is safer to use the proposed corrosion simulation method to evaluate the sealing performance of containment.
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