CPR 1000的IVR有效性评价中堆芯熔化及熔池形成过程分析

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Analysis of Process for Core Melt and Debris Pool Formation in IVR Evaluation for CPR1000

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

摘要: 在发生堆芯熔化的严重事故后,通过容器外冷却将熔融物滞留在容器内(IVR)是一种重要的核电站严重事故缓解措施。本文通过选取与IVR有效性评价相关的严重事故序列,用一体化严重事故计算程序进行堆芯熔化过程计算及下封头中熔池的形成过程分析,得出下封头中分层熔池的结构和成分及其对金属层热聚集效应的影响。通过有、无容器外冷却模型的对比计算,评价CPR1000堆型的IVR的有效性。结果表明:在下封头熔池的金属层所在的高度上存在明显的热集中效应;而容器外冷却能保证压力容器的完整性。
- CPR1000 /
- 熔融物滞留在容器内 /
- 堆芯融化 /
- 严重事故
Abstract: In-Vessel Retention（IVR） is an important and crucial method for preventing and mitigating the consequences of severe accidents.In this paper,a lot of severe accident sequences are selected under investigation according to the related laws and regulations,and then calculated by an integral severe accident analysis computer code to get the details of debris pool in lower head and their effects on the heat focusing effect.The results show that: there is a marked heat focusing effect on the height of metal layer in debris pool and the vessel can get its integrality under external reactor vessel cooling.
- CPR1000 /
- IVR /
- Core melt /
- Severe accidents