核电厂主控制室通风系统辐射监测及报警阈值设置研究

RESEARCH ON RADIATION MONITORING AND ALARM THRESHOLD SETTING OF MAIN CONTROL ROOM VENTILATION SYSTEM

本文对核电厂主控室进风γ辐射水平监测报警阈值进行了研究,从不同的角度分别讨论正常工况和事故工况下γ辐射水平报警阈值方案。采用MCNP程序模拟测量点的γ剂量率,针对两种不同的布置方案,对DBA-LOCA和LOCA两类典型事故进行了计算分析。结果表明:改进后主控室内的探测器报警阈值维持原报警阈值是合适的,可为主控室内人员提供有效的防护。

This paper studied the intake air gamma radioactive monitoring alarm threshold of main control room for normal operation and accident conditions of nuclear power plant. According to two different layout schemes,gamma radiation dose rate of measuring point was calculated by the MCNP code for two typical accidents( i. e. DBA-LOCA and LOCA). The results show that it is proper to keep the value of the detector alarm threshold even for the improved main control room,which can provide effective radiation protection for individuals.