Abstract:

Compared with CCWS-1, the detailed analysis for heat exchanger tube rupture accident of CN HCCB TBS using RELAP software is provided. The two system are simplified rationally, the relevant RELAP joint drawing is given, and the influence of different break point accidents on the CN HCCB TBS and ITER CCWS-1 are analyzed. Analysis results show that a similar shocking wave will spread from the break point towards both sides of the water pipes. And the helium released into the water will accumulate in the high points of CCWS-1, so reasonable exhaust path at the high points needs to be considered In addition, in order to limit the amount of helium accessing into CCWS-1, the isolation valves located on the waterside of heat exchanger need to be installed. The isolation valves must ensure high reliability and short response time.

Key words: CN HCCB TBS, Heat exchanger tube rupture, RELAP 5, CCWS-1, ITER

摘要：

利用RELAP 对中国氦冷固态实验包层模块(CN HCCB TBS)冷却系统的换热器管道破裂事故进行了详细的分析，与ITER 元件水冷却系统(CCSW-1)进行了比较，对两个系统进行了合理的简化，给出了相应的RELAP 节点图，并分析了不同破口事故工况对中国氦冷固态实验包层模块冷却系统和ITER CCWS-1 的影响。分析结果表明，事故发生后破口附近会形成类似水锤事件，进入CCWS-1 系统的氦气很可能会聚集在CCWS-1 系统的高点，需在系统高点设计合理的排气路径。另外，为了限制进入CCWS-1 系统的氦气量，建议在换热器水侧进出口处增加隔离阀门，隔离阀必须保证可靠性以及较短的响应时间。

关键词: 中国氦冷固态实验包层模块冷却系统, 换热器管道破裂事故, RELAP 5, CCWS-1, ITER