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实验在５ＭＷ核供热堆全尺寸，全参数模拟回路ＨＲＴＬ－５上进行，指出供热堆从常温，常压条件向沸水运行工况的过渡要经过三个步骤：１）通过加不凝气体Ｎ２来增加初始压力，这一措施能有效地消除低压下的ｇｅｙｓｅｒｉｎｇ和闪蒸不稳定；２）在此压力下用小于极限功率密度的功率密度值０．１５ＭＷｍ－２加热反应堆至单相压水运行工况１．５ＭＰａ，此举可控制加热段出口温度低于产生汽泡的起始温度，进而避免了低干度密度波的发生；３）从压水向沸水工况的过渡。研究了三种从压水向沸水过渡方法，在此基础上提出用小功率，低欠热度向沸水过渡的方案，此方案可保证过渡过程中的流动稳定性。通过仔细地选择热工参数，可以得到５ＭＷ供热堆从冷态到沸水工况的稳定启动过程。此结果对研究两相流稳定性，对供热堆的设计和安全有重大意义。
The experiment was carried out on HRTL-5, a full-scale, full-parameter analogue loop of a 5MW nuclear reactor. It was pointed out that the transition from the normal temperature and pressure conditions to the operating conditions of boiling water should go through three steps: 1) N2 to increase the initial pressure, this measure can effectively eliminate the low-pressure geysering and flash instability; 2) at this pressure is less than the limit of the power density density of 0.15MWm-2 heating value of the reactor to single-phase pressure of water Operating conditions 1.5MPa, this can control the heating section outlet temperature is lower than the initial bubble generating temperature, and thus avoid the occurrence of low-density wave density; 3) from the pressure water to boiling conditions of the transition. Three methods of transition from pressure water to boiling water were studied. Based on this, a scheme of low power and low degree of underheat transition to boiling water was proposed. This scheme can guarantee the flow stability during the transition. By careful selection of thermal parameters, a steady start-up of the 5 MW heating reactor from cold to boiling conditions can be obtained. This result is of great significance for studying the stability of two-phase flow and for the design and safety of the heating reactor.