核电厂大破口失水事故始发严重事故的源项研究

本工作以900MW核电厂为研究对象，利用一体化安全分析程序研究大破口失水事故始发严重事故下惰性气体类、挥发类和非挥发类裂变产物释放、迁移特性及分布状况，在此基础上，计算释入环境的源项。结果表明，几乎所有的惰性气体类放射性核素均释入环境，挥发类放射性核素释入环境的份额为10-3数量级，非挥发类放射性核素释入环境的份额为10-6～10-8数量级。计算所得源项可应用于厂外后果评价。

Source Term in Severe Accident Induced by Large Break Loss of Coolant Accident for Nuclear Power Plant

The behaviors of fission product were analyzed by using integral safety analyse code for nuclear power plant of 900 MW in the case of severe accident induced by large break loss of coolant accident. The behaviors including release, transport and distribution of fission product were analyzed, and the source terms into the environment were also calculated. It can be concluded that almost all of the inert gases release into the environment, the fraction of volatile radionuclide released into the environment is 10^-3 quantity, and the fraction of nonvolatile radionuclide released into the environment is 10^-6-10^-8 quantity. The results are useful for the assessment of the accident consequences.