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以清华大学的摩洛哥海水淡化项目(NHR-10)为原型,在保持功率不变、提高设计压力的情况下,对上部气空间的结构参数进行了分析和优化。用RETRAN-02程序建立了一体化自然循环核供热堆的分析模型,通过分析安全阀误开启、断管事故和负荷跟踪瞬态工况,研究上部气空间体积对核供热堆性能的影响。结果表明:在安全阀误开启、堆外断管事故中,堆芯失水量均随上部气空间体积的增大而增大;而在负荷跟踪瞬态工况中,上部气空间体积过小则会引起反应堆压力过高,从而影响反应堆安全。因此,在综合考虑反应堆运行和安全性的要求下,确定上部气空间的合理体积范围为1~2m3。
Taking the NHR-10 project of Tsinghua University as a prototype, the structural parameters of the upper air space were analyzed and optimized while keeping the power unchanged and the design pressure increased. By using RETRAN-02 program, an analysis model of integrated natural circulation heating reactor is established. By analyzing the failure of safety valve opening, breaking accidents and load tracking transient conditions, the influence of upper air volume on the performance of nuclear heating reactor . The results show that in the accidental opening of the safety valve and the accident of the unloading outside the reactor, the water loss of the reactor core increases with the increase of the volume of the upper gas space. In the transient condition of load following, the volume of the upper gas space is too small Will cause the reactor pressure is too high, thus affecting the reactor safety. Therefore, considering the requirements of reactor operation and safety, the reasonable volume of the upper gas space should be 1 ~ 2m3.