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作为球床模块式反应堆中燃料元件循环的重要组成部分,燃耗测量系统必须对连续排出堆芯的燃料球进行非破坏性在线测量,以确定是作为乏燃料球退出循环,还是将其返回堆芯。137Cs的活度和燃耗值存在很好的单调对应关系,因此在高温气冷堆(HTR-PM)核电站示范工程中将利用高纯锗探测器测量燃料球中137Cs的活度,进而根据燃耗计算曲线确定其燃耗值。通过实验以及基于Geant4的蒙特卡罗全模拟,利用效率传递方法准确得到了系统刻度的修正因子。同时发展了快速自动的谱寻峰和峰面积分析程序用于双源实验和MCNP模拟的γ谱分析,结果表明,尽管有干扰峰的影响,该系统预计对137Cs的活度测量相对不确定度依然可以控制在3.0%以内。在以上工作基础上成功研制并测试了一套全尺寸的燃耗测量系统原型。
As an important part of the fuel cell cycle in the bed reactor, the fuel consumption measuring system must make non-destructive on-line measurements of the fuel pellets discharged continuously from the core to determine whether to exit the cycle as a spent fuel pellet or return it to the stack core. Therefore, the activity of 137Cs in fuel pellets will be measured by high-purity germanium detector in the demonstration project of HTR-PM nuclear power plant, Consumption calculated curve to determine its fuel consumption value. Through experiments and Monte Carlo simulation based on Geant4, the correction factor of the system scale is obtained accurately by using the efficiency transfer method. At the same time, a fast and automatic spectral peak and peak area analysis program was developed for the γ-ray analysis of dual-source experiments and MCNP simulations. The results show that the system estimates the relative uncertainty of 137Cs activity measurement despite the interference peaks. Still can be controlled within 3.0%. Based on the above work successfully developed and tested a full-size fuel consumption measurement system prototype.