Strategy Analysis of Beyond Design Basis Accident for Typical 1000 MWe NPPs
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摘要: 以小破口失水事故(SBLOCA)为例,使用RELAP5和MAAP程序,计算超设计基准事故不同情况下操纵员操作时间窗口。计算结果表明:堆芯未熔化情况下,SBLOCA时执行充-排操作的时间窗口为1800 s,安全壳喷淋手动开启时间窗口为5400 s。严重事故情况下,操纵员需要对一回路卸压,针对二代改进型压水堆核电厂,避免堆芯熔化的时间窗口为300 s,避免压力容器损坏的时间窗口为3000 s。通过计算分析,给出设计扩展工况不同情况下安全设施需求及操纵员操作时间窗口。Abstract: The time windows for operators under different scenarios of beyond design basic accidents are calculated by RELAP5 and MAAP code,based on small break loss of coolant accident（SBLOCA）.The results show that,the time window for SBLOCA without core melt is 1800 s and the time window for the activation of the containment spray is 5400 s.The operator should depressurize the primary loop under severe accidents.According to different prevention purposes,the time window to avoid the core melt is 200 s and the time window to avoid the pressure vessel failure is 3000 s.Through calculation and analysis,the safety features for different scenarios of beyond design basic accident and operator time windows are provided.
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Key words:
- Small LOCA /
- BDBA /
- PSA level Ⅰ /
- Emergency operation procedure
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