关于深燃耗堆芯的反应性测量  

On the measurement of reactivity of high burnup reactor core

作　　者：陈雄月[1] 

机构地区：[1]核动力运行研究所,湖北武汉430074

出　　处：《核科学与工程》2004年第2期112-116,共5页Nuclear Science and Engineering

摘　　要：介绍了在实验性PWR堆上完成的深燃耗条件下测量反应性概况。用实验结论剖析了在国外核电站堆芯上应用噪声分析法对慢化剂温度系数作全燃耗期监测研究中出现的测量结果与常规方法相差2～5倍的现象。从测量公式和堆芯扰动模型图入手所作的分析结果说明,没有消除随燃耗不断增长的强自发裂变中子源干扰是产生差异的根本原因。事实说明:在多种噪声分析技术中,只有能够清除自发裂变中子源干扰的方法才能成功地应用于燃耗后堆芯的反应性测量。This paper introduced the general situation of the reactivity measurement on an experimental PWR under high burnup condition. The author wants to try the new experimental conclusion to explain the phenomenon that the MTC values determined from noise measurement were a factor of 2 to 5 smaller than the true MTC value obtained from traditional measurements or core calculation. Starting with the measurement formula and the diagram of the perturbation model of the reactor core, we made an analysis on it and finally concluded that the fundamental cause of the difference is that the perturbation neutron background coming from spontaneous fission can not be eliminated while it increases with burnup continuously. The fact explains; Among many noise analysis techniques,only the one which can eliminate the perturbation generated by spontaneous fission is selected to measure reactivity of after-burnup core.

关 键 词：深燃耗堆芯 反应性测量 中子噪声分析法 慢化剂 反应性温度系数 

分 类 号：TL375.51[核科学技术—核技术及应用]