自然循环工况下堆舱抢修人员辐射安全分析

Radiation safety analysis of emergency repair personnel in the reactor cabin under the natural circulation condition of the reactor

目的开展对反应堆自然循环工况下抢修人员辐射安全研究,阐述反应堆舱应急抢修人员辐射防护方法,为应急抢修人员辐射防护和抢修时间控制提供理论参考。方法针对反应堆自然循环工况下抢修人员辐射情况,利用蒙特卡罗方法进行模拟计算,并结合自然循环工况下反应堆舱实验测量的辐射数据进行验证分析。结果反应堆外照射模拟计算中子剂量率约为140μSv/h,γ辐射剂量率为48μSv/h,实验测量计算抢修人员在30 min堆舱内受到的有效剂量为2.2 mSv。结论自然循环功率下进堆舱抢修,γ辐射对抢修人员危害大,但在不同的位置维修,防护重点又有不同;佩戴呼吸器,30 min轮流抢修的方式,对抢修人员是安全的。

Objective Radiation safety of emergency repair personnel in the reactor cabin under the natural circulation condition of the reactor is studied,the radiation protection method of emergency repair personnel in the reactor cabin is described,which provides a theoretical reference for personnel radiation protection and emergency repair time control.Methods The radiation was simulated by the Monte Carlo method for emergency repair personnel in the reactor cabin under the natural circulation condition of the reactor,and the radiation was also analyzed with the radiation data measured by experiments in the reactor cabin under the natural circulation condition of the reactor.Results The neutron dose of external irradiation about reactor simulated computation was 140μSv/h,and gamma radiation dose rate was 48μSv/h.By experiment and calculation,the effective dose received by emergency repair personnel in the 30-minutein the reactor cabin was 2.2 mSv.Conclusions Under the natural circulation condition of the reactor,the gamma radiation is harmful to emergency repair personnel,but the focus of protection is different locations for maintenance.It's safe for emergency personnel to repair the reactor in 30 minutes in turn,wearing the respirators.