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压水堆发生失水事故时，从喷放开始到发生临界热流密度ＣＨＦ这一段时间称为临界时间ｔＣＨＦ·ｔＣＨＦ决定了安全保护系统必须投入的时间，因此正确计算ｔＣＨＦ非常重要，论文分析了Ｇｒｉｆｆｉｔｈ方法的缺点，作了较大的改进，经与实验值比较，改进方法所得的ｔＣＨＦ值与实验值吻合较好。
In the event of a waterlogging failure, the critical time tCHF · tCHF from the start of injection to the occurrence of the critical heat flux density CHF determines the time that the safety protection system must invest. Therefore, it is very important to correctly calculate tCHF. The paper analyzes the effects of Griffith The disadvantages of the method are greatly improved. Compared with the experimental value, the tCHF value obtained by the improved method is in good agreement with the experimental value.