核电站蒸汽发生器传热管泄漏监测总γ通道报警阈值研究

Research of Alarm Threshold Value of Steam Generator Tube Leak Total Gamma Monitoring Channel of Nuclear Power Plant

目的建立压水堆核电站蒸汽发生器传热管泄漏情况下总γ监测通道计数率的计算方法,计算在44 L/h和70L/h泄漏率条件下的计数率,指导该通道报警阈值的设置。方法假设了四种典型泄漏部位、两种典型功率,并考虑蒸汽携带、核素衰变等因素的影响,建立了蒸汽发生器传热管泄漏的数理模型。结果传热管泄漏率为44 L/h和70L/h的条件下,总γ监测通道计数率分别为60和90。结论建议选择60和90作为蒸汽发生器泄漏监测总γ通道报警阈值。

Objective To establish the calculation method of steam generator tube leak total gamma monitoring channel of nuclear power plant under the conditions of the steam generator tube leakage and ealcute the count rates of total gamma monito- ring channel when the leakage were 44 L/h and 70 L/h, which was suggestions for setting the alarm threshold value. Methods By assuming on four different leak location and two kinds of nuclear power level and taking the consideration of considered that the influences of steam - borne and nuclide decay, mathematical models of the leakage of steam generator tube were established. Results The count rates of total gamma monitoring channel were 60 and 90 when the leakage were 44L/h and 70L/h. Conclusion It was recommended to select 60 and 90 as the alarm threshold values of total gamma monitoring channel.