【摘要】 用测量蒸汽中１６Ｎ的放射性活度来监测蒸汽发生器传热管的泄漏，是一项新的技术，该监测系统确定泄漏率的一个重要参数是１６Ｎ在蒸汽发生器二次侧的迁移时间。本文认为１６Ｎ泄漏工质是以汽相形式随二次侧工质运动。根据蒸汽发生器二次侧工质的流动特点，将迁移时间分成四段计算，并重点提出了管束区汽相运动的速度分布计算模型。用本文模型对秦山核电厂蒸汽发生器的１６Ｎ迁移时间进行了计算，并与法国电力公司的计算结果进行了比较。更多还原

【Abstract】 The 16N transit time is essential to determine the leak rate of steam generator tubes leaks with 16N monitoring system,which is a new technique.A model was developed for calculation 16N transit time in the secondary side of steam generators.According to the flow characters of secondary side fluid,the transit times divide into four sectors from tube sheet to the sensor on steam line.The model assumes that 16N is moving as vapor phase in the secondary side.So the model for vapor velocity distribution in tube bundle is presented in detail.The 16N transit time calculation results of this model compare with these of EDF on steam generatot of Qinshan NPP.更多还原