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对聚变实验增殖堆（ＦＥＢ）工程概要设计的氚燃料循环构造了一个动态子系统模型，研制了模拟氚燃料循环系统的计算机程序ＳＷＩＴＲＩＭ，计算了运行一年后１０个子系统中的氚投料量和整个堆系统总的氚投料量。这对预示起动一个聚变热功率为１５０ＭＷ量级的实验增殖堆所需要的最少初始氚投料量有参考价值。计算结果表明，要求的最少初始氚贮备量除了与燃料气体净化系统和同位素分离系统中氚的平均逗留时间有关外，还与包层液态锂中提取氚的周期有关，特别是液态锂中可提取的最低氚浓度有关。另外，等离子体中的氚在第一壁、孔栏和偏滤器材料中的滞留量，在中子倍增材料Ｂｅ球中产生的氚和植入的氚也将影响要求的最少氚贮备量。
A dynamic subsystem model was constructed for the tritium fuel cycle designed in the Fusion Experiment Reactor (FEB) project. A computer program SWITRIM was developed to simulate the tritium fuel cycle system. The tritium feed amount in 10 subsystems after one year of operation was calculated. Total tritium feed volume of the entire stack system. This is of value for predicting the minimum initial tritium loading required to start an experimental breeder reactor with a fusion thermal power of the order of magnitude of 150MW. The calculated results show that the minimum required initial tritium reserve is related to the average residence time of tritium in the fuel gas purification system and the isotope separation system as well as the period of tritium extraction in the clathrated liquid lithium, The lowest tritium concentration. In addition, the retention of tritium in the first wall, aperture column and divertor material, the tritium produced in the neutron multiplier Be sphere and the implanted tritium will also affect the minimum required tritium reserve.