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介绍一种采用磁感应探头测量燃料棒芯块中钆含量的方法,阐述基于该方法研制的工程样机的测量结果,系统经过信号处理后可给出燃料棒的平均钆含量、异常芯块个数、异常芯块的相对位置等数据。在消除了锆管和铁磁杂质的影响后,工程样机在检测速度大于4m/min的情况下,不但能准确挑出棒中钆含量相差±1.0%的单个混料芯块,可信度为100%,而且能准确计算出整根燃料元件棒的平均钆含量(±0.2%),可信度优于95%。
A method for measuring gadolinium content in fuel rod pellets by using magnetic induction probe is introduced. The measurement results of engineering prototypes developed on the basis of this method are described. After signal processing, the average gadolinium content of fuel rods, the number of abnormal pellets, Abnormal pellet relative position and other data. After eliminating the influence of zirconium tube and ferromagnetic impurities, the engineering prototype can not only accurately pick out a single mixed pellet with a difference of ± 1.0% of the content of gadolinium in the sample when the detection speed is greater than 4 m / min, the reliability is 100%, and can accurately calculate the average root gadolinium gadolinium content (± 0.2%), the credibility is better than 95%.