全厂断电引发的严重事故中反应堆压力容器失效机理研究

Study on Failure Principle of Reactor Pressure Vessel in Severe Acident Induced by Station Blackout

以国际上典型的第2代3环路压水堆核电站为研究对象,采用严重事故最佳估算程序RELAP/SCDAPSIM,对全厂断电引发的严重事故中反应堆压力容器失效机理进行了计算分析。计算结果表明,RELAP/SCDAPSIM程序中的COUPLE二维有限元模型能够详细地预测压力容器内熔融物的行为特性,所给出的下封头失效时间和失效位置与已有实验结果吻合。

The reference plant was a typical three-loop PWR of generationⅡ,based on the best estimate computer code RELAP/SCDAPSIM,the failure principle of reactor pressure vessel in severe accident induced by station blackout was analysed.The calculation results show that RELAP/SCDAPSIM program of the COUPLE two-dimensional finite element model can predict the detailed molten material behavior characteristic in pressure vessel,and the lower head failure time and failure position are in good agreement with existing experimental results.