开发了一个用于对两相自然循环系统进行非线性分析的微机型的程序——NOTICONA。程序中包含了点堆中子动力学模型、反应性反馈模型、单相流模型、两相流模型(漂移流)、各种工况下的传热模型及有关的辅助模型等。该程序经与实验对比,证明是正确的和精确的。利用该程序计算了5MW低温供热堆的第一类密度波不稳定性,并得到了相应的边界。 Developed a NOTICONA microprocessor-based program for non-linear analysis of two-phase natural circulation systems. The program includes point reactor neutron dynamics model, reactive feedback model, single-phase flow model, two-phase flow model (drift flow), heat transfer model under various conditions and related auxiliary models. The program is compared with the experiment to prove that it is correct and accurate. Using this program, the first type of density wave instability of 5 MW low temperature heating reactor is calculated and the corresponding boundary is obtained.