Iodine Induced Stress Corrosion Crack (ISCC) on Zircaloy in light water reactor fuel cladding is affected by many variables. It is the main work that to tell the threshold of stress intensity factor (KISCC) and develop the velocity model of cracking. Among the determining factors, the material texture, temperature, fast neutron fluence and Iodine concentration are four influential ones. The work of this paper is establishing a function of valuing the KISCC with the four variables and modifying the model of cracking velocity. As a result, both models can well predict the results in certain ranges.%轻水堆的燃料包壳锆合金发生碘致应力腐蚀开裂(ISCC)是诸多因素共同作用的结果,确定应力强度因子阈值(KISCC),建立开裂速率模型是ISCC的主要工作。在ISCC众多的影响因素中,对KISCC影响最大的是织构、温度、快中子注量、碘浓度。本文根据实验数据拟合出KISCC的经验模型公式,并修正了开裂速率模型。结果表明,KISCC模型和修正后的开裂速率模型能够与试验结果符合较好。
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