钢衬里锈蚀对安全壳密封性的影响  

Effect of steel liner corrosion on the sealing performance of containment

作　　者：李鑫波 郭俊营 李忠诚 李文旭 贡金鑫 LI Xinbo;GUO Junying;LI Zhongcheng;LI Wenxu;GONG Jinxin(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian 116024,China;China General Nuclear Power Design Co.,Ltd.(Shenzhen),Shenzhen 518031,China;State Key Laboratory of Nuclear Power Safety Monitoring and Equipment,Shenzhen 518172,China)

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]海岸和近海工程国家重点实验室,辽宁大连116024 [3]深圳中广核工程设计有限公司,广东深圳518031 [4]核电安全监控技术与装备国家重点实验室,广东深圳518172

出　　处：《武汉大学学报（工学版）》2024年第4期435-445,共11页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51978125,51678104)。

摘　　要：安全壳钢衬里锈蚀后的风险评估对保障核安全具有重要意义,开展风险评估之前,需要对锈蚀钢衬里的性能及其对安全壳密封性的影响进行研究。结合国内外钢衬里典型锈蚀案例,论述了其锈蚀特征和机理;介绍了锈蚀钢衬里力学性能相关研究,并针对研究的不足进行了试验探究;介绍了安全壳钢衬里锈蚀后的密封性研究成果,并分析了钢衬里锈蚀模拟存在的问题;结合试验结果提出了一种钢衬里锈蚀模拟方法,并与国外方法进行了对比。结果表明:安全壳施工阶段避免混凝土内遗留杂物和保持涂层完好是防止钢衬里锈蚀最有效的方法;锈蚀率小于50%时,钢衬里的弹性模量基本不受锈蚀影响,但随锈蚀率增大,其屈服强度、极限抗拉强度和极限拉伸应变近似呈线性下降规律;钢衬里锈蚀会增大安全壳在事故工况下发生泄漏的风险;国外钢衬里锈蚀模拟方法高估了严重锈蚀情况下钢衬里撕裂时的应变和内压,采用提出的锈蚀模拟方法评估安全壳的密封性更加安全。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.

关 键 词：安全壳 钢衬里 锈蚀机理 力学性能 密封性 锈蚀模拟 

分 类 号：TG174[金属学及工艺—金属表面处理] TU511[金属学及工艺—金属学] TU378[建筑科学—建筑技术科学]