核燃料棒芯块^(235)U丰度检测方法研究

Study on the Abundance Detection Method of^(235)U Nuclear Fuel Pellet

核燃料棒中UO_(2)芯块的^(235)U丰度检测是保证核反应堆正常运行的重要环节,根据铀样品能谱谱形,通过迭代拟合算法精确选取目标信号的能量范围,减少了测量精度受UO_(2)芯块年龄的影响,扩大了目标信号能量选取范围,基于小波变换法,过滤无关频率信号,提高了突变信号的识别精度,进一步提高了检测速度。通过模拟存在异常丰度芯块燃料棒检测验证了方法的可行性。

The^(235)U abundance detection of UO_(2)pellets in nuclear fuel rods is an important link to ensure the normal operation of nuclear reactors.In this paper,the energy range of the target signal is accurately selected by iterative fitting calculation according to the energy spectrum shape of uranium samples,which reduces the influence of the age of UO_(2)pellets on the measurement accuracy and expands the energy range of the target signal.The recognition accuracy of abrupt change signal is improved,and the detection speed is further improved.The feasibility of the method is verified by simulating the presence of abnormal abundance pellet fuel rod detection.