ITER气体注入系统含氚管道的等效漏率评估  

Estimation of the equivalent leak rate for the tritium contained pipes of ITER gas injection system

作　　者：黄向玫[1] 李伟[1] 江涛[1] 李波[1] 夏志伟[1] HUANG Xiang-mei;LI Wei;JIANG Tao;LI Bo;XIA Zhi-wei(Southwestern Institute of Physics,Chengdu 610041)

机构地区：[1]核工业西南物理研究院,成都610041

出　　处：《核聚变与等离子体物理》2023年第1期82-87,共6页Nuclear Fusion and Plasma Physics

摘　　要：氚的泄漏会对公众安全和环境造成危害,有必要对含氚管道的泄漏进行分析。对ITER气体注入系统的含氚管道进行分析,对触发系统氚报警阈值(3×10^(5)Bq·m^(-3)/环境安全值,1×10^(8)Bq·m^(-3)/系统安全值)时,氚送气管、离子源管以及中性化管泄漏的等效空气漏率进行了计算。结果表明,氚送气管泄漏的风险最高。虽然氚送气管的气体压力低于包容管的夹层压力,但由于管道的氚浓度高,漏率大于3.2×10^(-8)Pa·m^(3)·s^(-1)时会触发报警。而在离子源管中虽然氚浓度低,但管道的气体压力远高于包容管的夹层压力,漏率大于6.1×10^(-6)Pa·m^(3)·s^(-1)时会触发氚报警。气体注入系统含氚管道泄漏的氚危害不可忽视,必须进行实时监测和防护。The leak of tritium will cause radiation hazard for public safety and environment,therefore the leak of tritium contained pipes should be analyzed.The tritium contained pipes of the ITER gas injection system are analyzed in this paper.An estimation on the air equivalent leak rate at the tritium alarm threshold(3×10^(5)Bq·m^(-3)for environment,1×10^(8)Bq·m^(-3)for pipes)is given for the leak of the tritium supply pipe,the neutralizer pipe and the ion source pipe.The results show that the leak of the tritium supply pipe has highest risk.Although the tritium supply pipe operates at a pressure lower than that in the surrounding enclosure,leak rate higher than 3.2×10^(-8)Pa·m^(3)·s^(-1)will trigger the tritium alarm due to high tritium concentration.To the contrary,the ion source pipe operates at a much higher pressure than that in the surrounding enclosure but has low tritium concentration.It will trigger the tritium alarm at leak rate higher than 6.1×10^(-6)Pa·m^(3)·s^(-1).The leak hazard of tritium contained pipes of gas injection system is not negligible,and real time monitoring and protecting is necessary.

关 键 词：氚送气管 离子源管 中性化管 泄漏 扩散 

分 类 号：TL624[核科学技术—核技术及应用]