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以模块化小型压水堆(ACP100)非能动余热排出系统为对象,建立系统进口管段一维传热模型,研究进口管段传热特性及系统泄漏瞬态,一维模型计算结果与三维模型基本吻合。分析结果表明,温度计测点设置在进口管高点下游的0.3 m外可以避免热源的影响;通过温度可以监测和量化泄漏率,泄漏率越高,测点最高温度就越大;当泄漏率高于8×10~(-4) m~3/h时,可以忽略泄漏过程中轴向传热的影响。
A one-dimensional heat transfer model of the inlet pipe section of the system was established. The heat transfer characteristics of the inlet pipe section and the system leakage transient were studied. The calculation results of the one-dimensional model were in good agreement with the three-dimensional model . The analysis results show that the setting of the measuring point of the thermometer can avoid the influence of heat source when the measuring point of the thermometer is 0.3 m downstream of the inlet pipe height. The leakage rate can be monitored and quantified by the temperature. The higher the leakage rate is, the higher the measuring point temperature is. At 8 × 10 ~ (-4) m ~ 3 / h, the influence of axial heat transfer during the leakage can be neglected.