【作者】 朴君； 杜海鸥；

【Author】 PIAO Jun;DU Hai-ou;China Institute of Atomic Energy;

【机构】 中国原子能科学研究院快堆研究设计所；

【摘要】 快堆钠工艺间的钢覆面结构是防止泄漏的钠与混凝土接触的重要屏障,其完整性直接关系到钠火事故下建筑结构的完整性和可靠性。本文以中国实验快堆309管廊间为研究对象,梳理了可能影响到钢覆面完整性的各项因素,基于池式钠火分析软件的输出结果,在建立钢覆面破损二维稳态模型的基础上,利用ANSYS热-结构耦合功能系统地分析了钢覆面的应力、应变分布。研究表明,在发生超设计基准的钠泄漏钠火事故时,钢覆面上的漏钠燃烧持续30 min后,其厚度从3 mm腐蚀至1.53 mm,并在两块钢板的焊接部分出现应力集中区,最大应力超过了材料的屈服强度,材料发生塑性变形,且局部的塑性应变超过了材料允许的最大应变,存在断裂的风险。本文的研究结果对后续快堆钢覆面结构的设计和安全评定方面具有一定的参考价值。更多还原

【Abstract】 The steel liner of sodium cell is an important boundary which can prevent the contact of leaking sodium and concrete,and its integrity will effect the integrity and reliability of buildings directly when sodium fire happens.The paper takes 309 sodium cell of CEFR as research subject,and sorts the influencing factors of steel liner’s integrity.The paper also analysis the distribution of the stress and strain by means of ANSYS thermal structural coupling,on the basis of steel liner’s failure two-dimensional model.The study shows that the steel liner in BDBA sodium fire will be corroded from 3 mm to 1.53 mm after 30 min firing of leaking sodium.And at the same time,there will be an area of stress concentration at the welding portion between two steel liners,and the maximum stress will be over the yield strength,which will lead to the plastic deformation or even fracture.The study results have value for the steel liner’s structure design and safety assessment.更多还原