事故下CAP1000核电厂主控室剂量特征研究

核电厂事故期间,为使主控室工作人员能够坚守岗位缓解事故后果,必须保证主控室的可居留性。放射性水平作为主控室可居留性的重要考虑因素,主控室人员接受的剂量必须满足相关标准导则的要求。本文以弹棒事故为参考工况,对事故情况下主控室的剂量特征进行了分析,给出了不同通风模式下的剂量结果,不同释放途径和不同核素组对剂量的贡献,以及剂量随时间的变化情况。针对CAP1000主控室非能动应急可居留系统设计,对该系统关键参数对剂量影响的敏感性进行了分析。研究结果为进一步深化事故后主控室剂量分析和可居留性优化改进提供了支持。

Study on Dose Characteristics of CAP1000 Main Control Room in Accident Condition

In order to keep workers stay in main control room(MCR)and take emergency measures to relieve accident under accident conditions at nuclear power plants,main control room must be habitable.Because radiation level is important for habitability,the receiving radiation dose of workers must be within the limits of the regulations.This paper analyzes the dose characteristics of MCR under ejection rod accident as an example,explains the dose results of different ventilation modes,the dose contribution of different release paths and nuclide groups,and the dose trend with time.Sensitivity analysis of dose affected by the VES design parameters are performed based on the design characteristics of CAP1000.The result of this paper sustains the further dose analysis and habitability improvement of MCR.