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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，正确计算ｔＣＨＦ非常重要。本文分析了Ｇｒｉｆｆｉｔｈ方法的缺点，对所作的较大的改进与实验值的比较，改进方法所得的ｔＣＨＦ值与实验值吻合较好
In the event of a water-logging PWR loss, the critical time tCHF · tCHF from the start of injection to the occurrence of critical heat flux density CHF determines the time that the safety protection system must invest. It is very important to correctly calculate tCHF. This article analyzes the shortcomings of the Griffith method, the larger the improvement made and the comparison of experimental values, the tCHF values obtained from the improved method are in good agreement with the experimental values