中国实验快堆缓发中子探测系统的瞬态模拟与分析

Transient Simulation and Analysis for Delayed Neutron Detection System of China Experimental Fast Reactor

根据中国实验快堆缓发中子探测系统的结构特点和探测原理,构建了缓发中子探测系统的计算模型。基于该模型,开发了计算机模拟程序。针对不同工况和不同燃料元件包壳破损时刻,进行了缓发中子探测信号的模拟计算。计算结果基本反映了计算情况下缓发中子探测信号的发展趋势。同时,还对燃料温度和燃料燃耗对缓发中子探测信号的影响进行了物理分析。

This research was advocated in order to assess the performance of the delayed neutron detection system of China Experimental Fast Reactor（CEFR）.Based on the structure and principle of the CEFR delayed neutron detection system,a calculating model of the delayed neutron detection signal was proposed.According to the model,a simulation program on computer was developed and some calculations were carried out in different working situation.The temperature and burnup＇s effect on the detection signal was analysed.Through this research work,it can be concluded that the delayed neutron detection system of CEFR basically meet the demand and the transient simulation result will help better understand the release mechanism of fission products and the detection principle of the delayed neutron detection system of CEFR.