中国实验快堆压力和流量反应性效应测量实验研究

在中国实验快堆(CEFR)物理启动过程中，对CEFR压力反应性和流量反应性效应进行了测量研究，并进行初步的误差分析。实验中堆芯反应性测量分别使用周期法和逆动态法。实验结果表明：CEFR压力反应性为正反馈，主容器覆盖气体压力从5 kPa升高至50 kPa过程中引入约+20 pcm反应性，升、降压力过程测量结果的相对偏差小于10%；CEFR流量反应性为负反馈，一回路泵转速从150 r/min升高至989 r/min过程中引入约-49 pcm反应性，升、降流量过程测量结果的相对偏差小于10%。周期法和逆动态法的测量结果符合较好。初步误差分析的结果表明，实验结果的测量精度主要由冷却剂温度测量的精度决定。

Experimental Study of China Experimental Fast Reactor Pressure and Coolant Flow Rate Reactivity Effect

In China Experimental Fast Reactor (CEFR), the core reactivity will change when pressure of the main container covering gas and coolant flow rate of the first circuit change, which are so-called pressure reactivity and coolant flow rate reactivity effect. The measurement of these two reactivity effects and preliminary error analysis were carried out in CEFR physic startup experiment. The classical period method and inverse kinetic method were used to measure reactivity. The results show that about +20 pcm reactivity will be introduced when the pressure of main container covering gas increases from 5 kPa to 50 kPa, which means the CEFR pressure reactivity is positive, and about -49 pcm reactivity will be introduced when the main pump speed increases from 150 r/min to 989 r/min, which means the CEFR coolant flow rate reactivity is negative. The results from period method agree well with that from inverse kinetic method. According to the preliminary error analysis, the error of test result is dominated by measuring error of coolant temperature.