MSLB事故源项及放射性后果分析

建立了AP1000核电厂主蒸汽管道破裂(MSLB)事故的保守分析模型。采用RG 1.183中定义的替代源项(AST)方法，计算了事故前碘尖峰和事故并发碘尖峰两种情况下释放的总有效剂量当量(TEDE)值，并分析了功率水平、蒸汽发生器水装量、分配系数等因素对TEDE值的影响。结果表明，极限工况的TEDE值在RG 1.183及GB 6249-2011规定的可接受限值范围内。

Analysis on Source Term and Radiological Consequence Due to MSLB Accident

The conservative analytical model was established for main steamline break (MSLB) accident of AP1000 nuclear power plant. According to the alternative source term (AST) method addressed in RG 1.183, the total effective dose equivalent (TEDE) was calculated for two cases of pre-accident iodine spike and accident-initiated iodine spike, and the influence of power level, steam generator water inventory and partition coefficient on the results was evaluated as well. The results show that the TEDE values for limiting case are within the acceptable dose limits of RG 1.183 and GB 6249-2011.