核电厂事故条件下内部泄漏途径对主控室可居留性剂量影响研究  

Effects of Internal Leakage Pathwayon Main Control Room Habitable Dose in Accident Condition of Nuclear Power Plants

作　　者：王琪 王凯 王建华 Wang Qi;Wang Kai;Wang Jianhua(State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,China Nuclear Power Engineering Co.,Ltd.,Shenzhen,Guangdong,518172,China;China Nuclear Power Design Co.,Ltd.(Shenzhen),Shenzhen,Guangdong,518178,China)

机构地区：[1]中广核工程有限公司核电安全监控技术与装备国家重点实验室,广东深圳518172 [2]深圳中广核工程设计有限公司,广东深圳518178

出　　处：《核动力工程》2020年第5期162-167,共6页Nuclear Power Engineering

摘　　要：为充分考虑事故条件下内部泄漏途径对核电厂主控室可居留区内工作人员的辐射安全影响,建立了考虑内部泄漏途径的放射性物质迁移模型,改进了舱室模型,分析了事故工况下主控室可居留区及周围非居留区厂房内放射性物质活度,开展了国内某核电厂主控室可居留性剂量计算分析,并对贯穿件泄漏率进行了敏感性分析。分析结果表明:考虑了内部泄漏途径的方法计算所得主控室可居留区内工作人员的甲状腺当量剂量分别是未考虑内部泄漏途径的8.704倍和120.749倍,其中以吸入内照射途径引起的有效剂量增加及甲状腺当量剂量增加尤为显著,有效剂量达到0.628 mSv,甲状腺当量剂量达到6.32 mSv,低于HAD 002/01-2019中的限值。贯穿件泄漏率的敏感性分析表明,在核电厂事故工况下,主控室可居留区内工作人员的有效剂量和甲状腺剂量与贯穿件泄漏率呈现出较为明显的线性正比关系。根据本文的研究结果对我国核电厂主控室及贯穿件的辐射防护设计提出了改进建议。In order to fully consider the effects of internal leakage pathway on the radiation safety of the operators in the main control room habitable area during potential accident condition,a radioactive material migration model is established and compartment model is modified considering internal leakage pathways in this paper.The radioactivity in the main control room habitable area and the surrounding non-habitable area is analyzed,and the habitable doses of the operators in the main control room of a nuclear power plant in China are assessed in this paper.At the same time,the sensitivity analysis for the leakage rate of the penetrations is also performed.The results show that:the effective dose and the thyroid equivalent dose of the operators in the habitable area of the main control room calculated by considering the internal leakage pathways method are 8.704 times and 120.749 times of the calculation results without considering the internal leakage pathways.The effective dose increase and the thyroid equivalent dose increase caused by the inhalation pathway are particularly significant.The effective dose is 0.628 mSv and the thyroid equivalent dose is 6.32 mSv which are lower than the limits in HAD 002/01-2019.The sensitivity analysis shows that in the potential accident condition,the effective dose and thyroid equivalent dose of the operators in the main control room habitable area show a clear linear proportional relationship with the penetration rate of penetrations.The research results in this paper provide suggestions for the improvement of the radiation protection design of the main control room and penetrations of nuclear power plants in China.

关 键 词：主控室 可居留性 安全壳贯穿件 有效剂量 甲状腺当量剂量 

分 类 号：TL48[核科学技术—核技术及应用]