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钢制安全壳是防止严重事故工况下放射性物质向环境释放的最后一道屏障,因此有必要研究分析事故条件下安全壳外液膜覆盖率对安全壳完整性影响,以得到安全壳在事故工况下的失效裕度。应用非能动安全壳分析程序,建立了大功率非能动反应堆非能动安全壳冷却系统(Passive Containment Cooling System,PCS)的热工水力模型,并以冷段双端剪切事故为基准研究对象,分别研究了水分配器单一故障和出水管堵管叠加水分配器故障两种事故工况。分析结果表明,两种事故工况在液膜覆盖率大于35%时,均不会出现短期安全壳超压超温失效;事故后24 h,液膜覆盖率低于45%时,安全壳出现长期冷却失效。此次研究得出结论:在流量大于61.76 m3·h-1、安全壳液膜覆盖率大于45%时,事故发生后24 h安全壳不会失效。
Steel containment is the last barrier to prevent the release of radioactive material to the environment under serious accidental conditions. Therefore, it is necessary to study and analyze the influence of containment of liquid film outside containment on the integrity of containment under accident conditions, Conditions of the failure margin. The thermal hydraulic model of Passive Containment Cooling System (PCS) for high power passive reactors was established by using the passive containment analysis program. Based on the double-end shear accident in cold section, Water distributor single fault and outlet pipe plugging water distributor fault two accident conditions. The analysis results show that the short-term overpressure failure of containment does not occur when the liquid film coverage is higher than 35% for both accident conditions. When the liquid film coverage is less than 45% after 24 h, the containment appears Long-term cooling failure. The study concluded that when the flow rate is greater than 61.76 m3 · h-1 and the liquid film coverage of the containment is more than 45%, the containment will not fail 24 h after the accident.