反应性测量中本底与中子源修正计算方法研究

在核电厂反应堆的反应性测量中，γ本底电流、中子源引入的电流、电路噪声等干扰项在实测电流中占有显著份额，给反应性的测量计算带来很大影响，在动态刻棒等反应性测量工作中必须对其进行修正。本文分析了本底与中子源电流对反应性测量的影响，并自主开发了一种本底电流、中子源电流修正方法--双重拟合法。该方法基于点堆模型，通过对包含本底与中子源的逆动态方程的分析，计算得到准确的反应性以及本底电流、中子源电流。通过试验堆动态刻棒实验的数据对本方法进行了验证，得到了理想的结果。

Research on Correction of Background and Neutron Source in Measurement of Reactivity

In the measurement of reactivity ,disturbance currents such as γbackground , electrical noise and neutron source currents take a significant fraction in the measured signal ,resulting in a large error to the measured reactivity .In this paper ,the impacts of background and source currents on the reactivity measurement were described ,and the dual fitting method ,a self‐developed method on the correction of background and source currents ,was introduced .The method was used in the dynamic rod worth measure‐ments in a test reactor and satisfactory results were obtained .