反应堆堆内部件振动中子噪声物理模型研究

中子噪声分析对反应堆堆内部件振动监测有重要意义。本文采用微扰理论 (系统方程和扰动源项 )、控制理论 (传递函数 )、反应堆动力学方程 (点堆动力学方程 )建立了堆内部件振动中子噪声物理模型 ,并且用它来解释实验 ,较好地解释了实验测量得到的功率谱密度。在理论模型中通过引入一低频噪声项 ,较好地描述了实验测量功率谱密度低频端的抬高。另外对于吊篮梁式振动 ,则采用四个堆外探测器来实现监测。通过这种方法 ,可以较好地监测吊篮梁式振动和进行计算机仿真模拟。

A Study of Neutron Noise Physical Model for Incore Vibration

It is important to monitor incore vibration with the neutron noise method. The perturbed theory(system equation and perturbed noise source), control theory(transfer function) and the reactor dynamics(point kinetic equations) have been used to build the physical model. The model has been used to interpret the power spectral density of the zero power reactor simulated experiment. In the model, a low frequency noise term has been introduced to describe the abnormal increase of low frequency part of PSD curve.