AP1000核电厂大量放射性释放源项分析

在AP1000核电厂的某些严重事故情景中，安全壳可能发生失效或旁通，导致大量放射性物质释放到环境中，造成严重的放射性污染。针对大量放射性释放频率贡献最大的3种释放类别（安全壳旁通、安全壳早期失效和安全壳隔离失效），分别选取典型的严重事故序列（蒸汽发生器传热管破裂、自动卸压系统阀门误开启和压力容器破裂），使用MAAP程序计算分析了释放到环境中的裂变产物源项。该分析结果为量化AP1000核电厂的放射性释放后果和厂外剂量分析提供了必要的输入。

Analysis of Large Release Source Terms in AP1000 Nuclear Power Plant

In some severe accident scenarios of AP1000 nuclear power plant,a breach or bypass of the containment will lead to large release to environment,which causes severe radioactive pollution of environment.Three release categories(bypass,early containment failure and containment isolation failure) have the largest contribution to large release frequency.Three typical severe accidents(steam generator tube rupture,spuriously open of automatic depressurization system valves and reactor pressure vessel rupture) were selected as typical cases corresponding to the three release categories and the fission-product source terms released to environment were calculated using MAAP code.The analysis results are provided as essential input data for quantifying the release of AP1000 nuclear power plant and the offsite dose analysis.