脉冲堆瞬发负温度系数的噪声测量法

Method of Measuring Instant Negative TemperatureCoefficient of Pulsed Reactor by Noise Techniques

根据反应堆堆内中子信号和温度信号的相关性，以及中子动力学方程和热力学绝热方程，利用噪声信号分析技术，在频域内建立了测量脉冲堆堆芯瞬发负温度系数的物理模型。同时，利用反应堆稳态运行时中子信号以及温度信号的扰动信息，通过自回归滑动和ＡＲＭＡ模型，得到中子噪声信号以及温度噪声信号的功率谱密度（ＰＳＤ），再在频域内，通过最优化方法得到脉冲堆堆芯瞬发负温度系数值，该值与理论值相符。

Based on the relationship of neutron noise and temperature noise in reactors,a physical model which will be used to calculate the instant negative temperature coefficient(α )of pulsed reactor is established in frequency domain by noise techniques.The neutron dynamic equation and thermal dynamic equation were used while constructing the physical model.According to the disturbance information of neutron signal and temperature signal in the stable operation situation of reactors,the power spectrum densities are get by auto regress moving average model.The α of the pulsed reactor is obtained by best fitting method in the frequency domain.And the results are relative to the theory values.