Control rod is used to change the power in nuclear reactor.?Certainly, the core at any moment can be made subcritical condition and shut downs when occurring?to emergency instance in the core. The rod is grouped based...Control rod is used to change the power in nuclear reactor.?Certainly, the core at any moment can be made subcritical condition and shut downs when occurring?to emergency instance in the core. The rod is grouped based?on their function and located at different places in the core where their feature is maximized.?Two methods of control rod calibration are the asymptotic period method and the rod-drop method, which were applied in this experiment. In the first method, the reactor is made supcritical by inserting the control rod to be calibrated a certain level. The rod drop method is to determine the subcritical;at the critical state, the rod to be calibrated is dropped into the core, and the resulting decay of neutron flux is observed and related to the reactivity. In this paper, the regulating rod will be calibrated according to the reactivity in OPR-1000 that corresponds to a certain control rod insert or withdraw, and the reactivity in power reactor depends?on the integral and differential control rod group too. The core simulator OPR1000 is used to test those methods.展开更多
一、热通道的体积释热率堆芯功率分布在核电厂的运行过程中不断变化。对于发热较多、流量较小的热通道,容易出现偏离泡核沸腾,传热恶化,元件壁温上升,使包壳氧化加速而被烧毁。因此确定堆芯元件热点的烧毁比(DNBR)值,是核电厂安全分析...一、热通道的体积释热率堆芯功率分布在核电厂的运行过程中不断变化。对于发热较多、流量较小的热通道,容易出现偏离泡核沸腾,传热恶化,元件壁温上升,使包壳氧化加速而被烧毁。因此确定堆芯元件热点的烧毁比(DNBR)值,是核电厂安全分析的主要任务之一。在实际计算中,根据堆芯的功率分布情况,可将堆芯分成 N 个子通道,每个子通道用 n 来表示。为了分析方便,对应各子通道假设有一个热通道存在。求解时空中子动力学方程,可以给出第 n展开更多
文摘Control rod is used to change the power in nuclear reactor.?Certainly, the core at any moment can be made subcritical condition and shut downs when occurring?to emergency instance in the core. The rod is grouped based?on their function and located at different places in the core where their feature is maximized.?Two methods of control rod calibration are the asymptotic period method and the rod-drop method, which were applied in this experiment. In the first method, the reactor is made supcritical by inserting the control rod to be calibrated a certain level. The rod drop method is to determine the subcritical;at the critical state, the rod to be calibrated is dropped into the core, and the resulting decay of neutron flux is observed and related to the reactivity. In this paper, the regulating rod will be calibrated according to the reactivity in OPR-1000 that corresponds to a certain control rod insert or withdraw, and the reactivity in power reactor depends?on the integral and differential control rod group too. The core simulator OPR1000 is used to test those methods.
文摘一、热通道的体积释热率堆芯功率分布在核电厂的运行过程中不断变化。对于发热较多、流量较小的热通道,容易出现偏离泡核沸腾,传热恶化,元件壁温上升,使包壳氧化加速而被烧毁。因此确定堆芯元件热点的烧毁比(DNBR)值,是核电厂安全分析的主要任务之一。在实际计算中,根据堆芯的功率分布情况,可将堆芯分成 N 个子通道,每个子通道用 n 来表示。为了分析方便,对应各子通道假设有一个热通道存在。求解时空中子动力学方程,可以给出第 n
