PCS表面液膜覆盖率对安全壳完整性影响分析

发布时间：2018-06-14 00:03

本文选题：非能动安全壳分析程序 + 非能动安全壳　；参考：《核技术》2017年01期

【摘要】：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。
[Abstract]:The steel containment is the last barrier to prevent the release of radioactive material to the environment in serious accident conditions. Therefore, it is necessary to study and analyze the influence of the film coverage on the integrity of the containment under the accident conditions to get the failure margin of the containment under the accident condition. The large work should be established by the non active case analysis program. The thermal hydraulic model of the Passive Containment Cooling System (PCS) of the non active reactor is used to study the two accident conditions of the single fault of the water dispenser and the overlay water distributor of the outlet pipe. The results show that the two accident workers are the accident workers. When the liquid film coverage is more than 35%, no short term containment overpressure overpressure failure will occur. After the accident, 24 h and liquid film coverage less than 45%, the safety shell has long cooling failure. This study concluded that when the flow rate is greater than 61.76 m3 H-1, the cover of the containment liquid film is greater than 45%, the 24 h containment will not fail after the accident.
【作者单位】：环境保护部核与辐射安全中心;
【基金】：国家科技重大专项项目(No.2015ZX06002007)资助~~
【分类号】：TL364.3

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