Optimization of Method for Finding Doppler Heating Starting Point in Qinshan Nuclear Power Plant Ⅱ
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摘要: 对秦山第二核电厂寻找多普勒发热点过程中的物理参数和现象进行了分析,并对寻找多普勒发热点的试验方法进行了优化,以便在试验中能够准确地找到多普勒发热点。分析认为,寻找多普勒发热点时,温度信号使用冷却剂热段测温旁路温度,中子注量率信号使用对数处理后的信号,可以更容易观察多普勒发热点出现时的现象;在中子注量率上升过程中寻找多普勒发热点的试验过程,优化为在中子注量率上升过程中寻找并在中子注量率下降过程中确认,可以有效避免温度干扰造成的误判。Abstract: Through analyzing the physical parameters and phenomenon during the tracing of Doppler heating starting point, the paper optimize the test method for finding Doppler heating starting point in Qinshan Nuclear Power Plant Ⅱ. The analysis found that when finding Doppler heating starting point, it is more suitable to use the signal of hot leg temperature of coolant temperature measuring bypass, and neutron flux rate logarithmic signal. In addition, it can avoid the misjudgment effectively in finding the Doppler heating starting point in the course of neutron ascending, and confirming once more in the course of neutron descending.
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