Study on Release and Migration of Radionuclides under the Small Break Loss of Coolant Accident in a Marine Reactor
Study on Release and Migration of Radionuclides under the Small Break Loss of Coolant Accident in a Marine Reactor
复制标题
DOI：
10.1155/2021/6635950
复制
发表时间：
2021-04
影响因子：
1.1
通讯作者：
Z. Fang;Zou Shu-liang;L. Zejun;Xi Tao;Xu Shoulong;Huang Yan;Feng Jinjun
中科院分区：
文献类型：
--
作者：
Z. Fang;Zou Shu-liang;L. Zejun;Xi Tao;Xu Shoulong;Huang Yan;Feng Jinjun
利用严重事故分析程序MELCOR，建立了某船用反应堆小破口失水事故（SBLOCA）分析模型。分析了一起SBLOCA严重事故中放射性核素的释放和迁移规律。氢气源项释放分析表明，最大氢气释放量为248.567 kg，氢气释放量占空气体积的4%以下。因此，不会有氢气爆炸事故的危险。主要研究了以氚为代表的惰性气体、以碘化铯为代表的挥发性气体和以钡为代表的非挥发性核素的释放、输运、滞留和最终分布行为。结果表明，反应堆堆芯完全暴露的时间滞后510 s，核素初始释放时间滞后1916 s。在一回路系统、安全壳和环境中的释放份额分别为0.013%、0.06%和32.71%。此外，Ba分别占0.016%、0.0032%和3.28%，CsI分别占0.0145%、0.0012%和2.845%。
Using severe accident analysis program MELCOR, the small break loss of coolant accident (SBLOCA) analysis model was established for a marine reactor. The release and migration of radionuclides were analyzed during a severe accident induced by SBLOCA. The analysis of the hydrogen source term release showed that the maximum hydrogen release amount was 248.567 kg, and the hydrogen release amount accounted for less than 4% of the air volume. So, there would be no danger of hydrogen explosion accidents. The research mainly focused on the behaviors of the release, the transport, the retention, and the final distribution of inert gases represented by Xe, volatile gases represented by CsI, and nonvolatile nuclides represented by Ba. The results showed that the reactor core exposed completely with a lagging by 510 s and the initial release time of nuclides was lagged by 1916 s. The release shares of Xe in the primary circuit system, the containment, and the environment were 0.013%, 0.06%, and 32.71%, respectively. Also, Ba shared 0.016%, 0.0032%, and 3.28%, respectively, and CsI shared 0.0145%, 0.0012%, and 2.845%, respectively.