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本文建立了燃料操作区域气载放射性浓度计算模型,对典型核素气载放射性浓度的变化趋势进行了分析。利用该模型研究了核素类型、通风流量等因素对燃料操作区域气载放射性浓度的影响,最后分析了燃料操作区域气载放射性的主要来源。结果表明,不同核素达到气载放射性浓度最大值的时刻不同,应取各核素燃料操作期间气载放射性浓度最大值作为设计值;燃料操作区域排风量与其净空间体积比值λ_h与气载放射性浓度成反比,反应堆冷却剂中放射性活度是气载放射性的主要来源,可以通过调节排风量、降低冷却剂放射性活度、降低蒸发量将气载放射性控制在一定水平。
In this paper, a model for calculation of airborne radioactive concentration in the fuel operation area is established, and the trend of the change of the radioactive concentration of typical radionuclides is analyzed. The model was used to study the influence of radionuclide types, ventilation flow rate and other factors on the airborne radioactive concentration in the fuel operating area. Finally, the main sources of airborne radioactivity in the fuel operating area were analyzed. The results show that different radionuclides have different time to reach the maximum value of airborne radioactive concentration, the maximum value of airborne radioactive concentration during the operation of each nuclide fuel should be taken as the design value. The ratio of the air volume of the fuel operating area to its net space volume, λ_h, Radioactive concentration is inversely proportional to the radioactive activity of the reactor coolant is the main source of airborne radioactivity can be controlled by adjusting the exhaust volume, reducing the radioactivity of the coolant, reducing the evaporation of airborne radioactive control to a certain level.