大亚湾核电基地氡浓度水平调查与评估

Investigation and Evaluation of Radon Concentration Level in Day a Bay Nuclear Power Base

对大亚湾核电基地机组正常运行期间.热停堆期间和反应堆完全卸料模式(RCD)工作场所氡浓度水平进行了调查和评估。结果表明:机组正常运行期间,平衡当量氡浓度范围为4.49~250.48 Bq/m2,氢及其子体所致剂量约0.066 mSv/a。热停堆期间,通风系统(EBA)投入运行前,反应堆厂房平衡当量氢浓度为828.08~1161.70 Bq/m3,氢及其子体所致剂量约40μSv。RCD模式下,反应堆厂房平衡当量氡浓度范围为5.96~10.57 Bq/m2,氡及其子体所致剂量约0.021 mSv/a.热停堆期间反应堆厂房氢浓度高于标准控制值,应采取相应干预措施。

The radon concentration levels in the workplace of the Daya Bay Nuclear Power Base during normal operation,during thermal shutdown,and in the reactors complete discharge mode(RCD)were investigated and evaluated.The results show that during normal operation of the unit,the equilibrium equivalent radon concentration range is 4.49Bq/m3-250.48Bq/m3,and the dose caused by radon and its progeny is about 0.066mSv/a.During the thermal shutdown,before the ventilation system(EBA)was put into operation,the equilibrium equivalent radon concentration of the reactor building was 828.08 Bq/m3to 1161.70 Bq/m3,and the dose caused by radon and its progeny was about 40μSv.In the RCD mode,the equilibrium equivalent radon concentration range of the reactor building is 5.96 Bq/m3 to 10.57 Bq/m3,and the dose caused by radon and its progeny is about 0.021 mSv/a.During thermal shutdown,the radon concentration in the reactor building is higher than the standard control value,and corresponding intervention measures should be taken.