采用一维特征线方法建立了快堆蒸汽发生器单管发生双端断裂情况下 ,水从破裂传热管流出的泄漏率计算模型和钠 水反应气泡从球状到柱状的变温绝热生长模型。根据断裂处氢气压力变化 ,并考虑管内流体的压缩性建立了水的泄漏率模型。对分别发生在单相水区 ,单相蒸汽区和两相汽水混合区的大泄漏钠 水反应进行瞬态计算和定性分析。结果说明 ,传热管不同位置发生泄漏对二回路造成的影响不同 A one-dimensional characteristic line method was used to establish a leakage rate model of water leakage from ruptured heat-transfer tubes and a change from spherical to columnar adiabatic growth model of sodium-water reaction bubbles under the condition of double-ended fracture. Based on the change of hydrogen pressure at the fracture site and considering the compressibility of the fluid in the pipe, a water leakage rate model was established. The transient response and qualitative analysis of large leaked sodium water which occurred in the single-phase water zone, single-phase steam zone and two-phase steam-water mixing zone respectively were carried out. The results show that different locations of the heat transfer tube leakage have different effects on the second loop