反应性测量中本底与中子源修正计算方法研究

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

摘要: 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。

Abstract: In the measurement of reactivity, disturbance currents such as γ background, 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 measurements in a test reactor and satisfactory results were obtained.