Preliminary Analysis of Hydrogen Distribution and Risk under Severe Accident Conditions for QINSHAN NPP Unit 2 Containment
-
摘要: 采用模块化严重事故计算工具,对秦山二期核电厂大破口失水事故(LB-LOCA)、小破口失水事故(LB-LOCA)和全厂断电(SBO)诱发的严重事故序列以及安全壳内的氢气浓度分布进行了计算分析。在此基础之上,参考美国联邦法规10CFR关于氢气控制和风险分析的标准,对安全壳的氢气燃烧风险进行了初步研究。分析结果表明:大破口严重事故导致的安全壳内的平均氢气浓度接近10%,具有一定的整体性氢气燃烧风险,小破口失水和全厂断电严重事故可能不会导致此类风险,但仍然存在局部氢气燃烧的可能。Abstract: Severe accident sequences induced by large-break loss-of-coolant accident（LB-LOCA）,small-break loss-of-coolant accident（SB-LOCA） and station blackout（SBO） are calculated by using an integral systems analysis computer code for QINSHAN NPP Unit2.Hydrogen concentration distributions in the containment atmosphere and their potential deflagration risk are investigated,according to the hydrogen control and risk analysis standard of US 10 CFR.The results show that the average hydrogen concentration un-der LB-LOCA severe accident is nearly 10%,which means large scale hydrogen deflagration might occur.In spite of the possibility of local deflagration,such large scale deflagration under SB-LOCA and SBO severe accidents maybe cease.The analysis provides a reference for hydrogen control and severe accident management of QINSHAN NPP Unit 2.
-
Key words:
- Severe accident /
- Containment /
- Hydrogen concentration distribution /
- Hydrogen risk
-
计量
- 文章访问数: 12
- HTML全文浏览量: 4
- PDF下载量: 0
- 被引次数: 0
下载:
