全厂断电事故下封头熔池传热行为的研究

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Study on Heat Transfer Behavior of Molten Pool in Lower Head Introduced by SBO Severe Accident

School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China

摘要: 利用SCDAP/RELAP5系统程序对CPR1000核电厂进行了建模,并对全厂断电事故(SBO)的进程进行了模拟,分析了SBO中从堆芯开始裸露到完全裸露的熔化过程以及堆芯熔融物掉入下封头后下封头中熔池的传热行为。结果表明,熔融物在下封头形成一个混合层和重金属多孔介质层,且失效的位置在下封头侧部30°～40°位置(压力容器底部为0°)。
- 全厂断电事故(SBO) /
- SCDAP/RELAP5 /
- 堆芯熔化 /
- 熔池
Abstract: In this paper,the severe accident induced by Station Blackout（SBO） of CPR1000 is simulated by SCDAP/RELAP5 code.The progression from the initiation of core uncovering and the full uncovering of the core to the core melt relocation into the lower head are analyzed.The heat transfer behavior of molten pool in the lower head is also discussed in this paper.The results achieved indicate that the damage location is at the 30°~40° side surface of the lower head（taking the bottom of PRV as 0°）.
- SBO（Station Blackout） /
- SCADP/RELAP5 /
- Core melt /
- Molten pool