ASTEC程序中反应堆熔池结构对压力容器下封头换热计算的影响  

Influence of Corium Configuration on Heat Transfer Calculation of RPV Lower Head with ASTEC Code

作　　者：宋维[1] 周克峰[1] 郑鹏 陈妍[1] 左嘉旭[1] 李朝君[1] 

机构地区：[1]环境保护部核与辐射安全中心,北京100082

出　　处：《原子能科学技术》2017年第10期1785-1790,共6页Atomic Energy Science and Technology

基　　金：国家科技重大专项资助项目(2013ZX06002001)

摘　　要：反应堆严重事故工况下堆内环境复杂,针对下腔室内熔融物行为的试验非常有限,因此通常采用假设的熔池结构模型进行事故评价。本文使用ASTEC程序中的3种熔池结构模型,评价典型严重事故工况下不同熔池结构对下封头内壁换热及压力容器完整性的影响。计算结果表明:在外壁绝热且下封头失效仅使用温度限值的条件下,两层熔池结构导致下封头失效时间最短,且由于顶部金属层集热效应,失效位置位于熔池上部;三层熔池结构由于底层金属层的出现,使下封头下部温度持续升高而发生失效,但其失效时间长于两层熔池结构的情况。As the in-vessel environment under the reactor severe accident condition is complicated and the experiment on the behavior of corium in the lower plenum is limited,some hypothetical corium configuration models are usually adopted to perform the accident assessment.In this paper,three kinds of corium configuration models built-in ASTEC code were used to assess the effects of different corium configurations on the heat transfer of the lower head and the integrity of the pressure vessel.The calculation results show that in case of adiabatic outer wall of lower head and only the temperature limit used as the failure criterion,the two-layer corium configuration leads to the shortest failure time of the lower head,and the failure point is located at the upper part because of the heat focus effect of top metal layer.For three-layer corium configuration,the temperature of the lower part of lower head continues to rise due to the presence of the bottom metal layer.The failure point is located at the lower part of the lower head,but the failure time is longer than that of the two-layer corium configuration.

关 键 词：严重事故 ASTEC程序 熔池 下封头 换热 

分 类 号：TL364.4[核科学技术—核技术及应用]