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用脉冲中子源法测量反应堆的负反应性,如按通常的点堆模型导出的方程进行实验数据处理时,则空间效应非常严重,不能得到准确结果。为了克服上述困难,本文从空间动态方程出发,导出测量负反应性的空间积分表达式。并在铀-水栅零功率装置上测量了两种布置方案的控制棒价值。被测的负反应性范围为(5—8)β。同时分析了用点堆模型导出的几种方法的可靠程度。
The negative reactivity of the reactor is measured by the pulsed neutron source method. When the experimental data are processed according to the equation derived from the usual point stack model, the space effect is very serious and accurate results can not be obtained. In order to overcome these difficulties, this paper derives the spatial integral expression of negative reactivity measurement from the space dynamic equation. The control rod values of the two arrangements were measured on a uranium-water gate zero-power unit. The range of negative reactivity measured was (5-8) β. The reliability of several methods derived from the point heap model is also analyzed.