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安全壳结构作为核电站第三道保护屏障,评估其结构强度在事故工况下是否具有足够的裕度至关重要,10年一次的强度试验是现行检查在役电站安全壳结构安全性的主要方法。预应力混凝土安全壳结构中预应力不可避免地随时间发生损失,通过建立包含预应力空间分布的安全壳结构数值模型,计算评估安全壳结构在不同预应力损失工况下抵抗事故压力的能力是弥补不能高频次开展强度试验的有效方法。通过建立CPR1000机组安全壳结构的精细有限元模型,计算分析安全壳结构在强度试验各压力台阶下的结构响应,最后采用安全壳结构在压力试验中的自动化采集数据验证了计算模型的准确性。结果表明:建立的安全壳有限元数值计算模型可以用来准确计算和评估结构抵抗事故压力的能力。
As the third protective barrier of nuclear power plant, it is very important to evaluate the strength of containment structure under accident conditions. The 10-year strength test is the main method to check the safety of containment structure in service . Prestressed concrete containment structure prestress inevitably with the loss of time, through the establishment of contain prestressed spatial distribution of containment structure numerical model, calculate and evaluate the containment structure under different prestress loss conditions ability to withstand accident pressure is Make up can not be carried out at high frequency intensity test an effective method. Through the establishment of a precise finite element model of the containment structure of CPR1000, the structural response of the containment structure under various pressure steps of the strength test is calculated and analyzed. Finally, the accuracy of the calculation model is verified by the automated data collected by the containment structure in the pressure test. The results show that the established numerical simulation model of the containment can be used to accurately calculate and evaluate the ability of the structure to resist accident pressure.