ITER实验包层吹洗气前处理系统的FMECA研究

实验包层(TBM)输出吹洗气前处理系统将安装在国际热核聚变实验堆(ITER)装卸TBM的通道内(Port Cell),它的功能是将TBM输出的含氚吹洗气进行过滤、除HTO、冷却、调流量等处理,处理后输出到氚提取系统。介绍了该系统的工艺过程和系统组件,以氚释放危险为判据,对该系统进行FMECA(故障模式、影响及危害性分析),并作出分析表。找出了几种故障模式或薄弱环节,进行了尝试性的风险优先数和故障模式危害度计算,提出了设计改进措施和使用补偿措施;最后确定了需要重点关注的4种需导致释非正常过量释放的潜在故障模式。这些故障分析为降低系统氚过量释放危险设计提供了依据,也为TBM其他附属氚系统的安全分析奠定了基础。

FMECA about pre-treatment system for purge gas of test blanket module in ITER

The pre-treatment system for purge gas of TBM will be installed in Port Cell for installing TBM in ITER,the function of which includes filtering purge gas,removing HTO,cooling,and adjusting flow rate,etc.The purge gas treated will be conveyed into TES(Tritium Extraction System).The technological process and system components in pre-treatment system were introduced.Tritium releasing risk was regarded as failure criterion;failure mode,effects and criticality analysis(FMECA) were carried out and several weaknesses or failure mode in the system were found.Besides,risk priority number(RPN) and failure mode criticality were calculated.Finally,some design improvement measures and usage compensation measures were given.At last,four important potential failure modes were found out.The analysis will provide the design basis for reducing risk of excessive tritium releasing,which is also a useful assist for safety analysis about other tritium system.