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1An accurate solution of point kinetics equations of one-group delayed neutrons and an extraneous neutron source for step reactivity insertion显示文摘The continuous indication of the neutron density and its rate of change are important for the safe startup and operation of reactors. The best way to achieve this is to obtain analytical solutions of the neutron kinetics equations because none of the developed numerical methods can well satisfy the need for real-time or even super-time computation for the safe startup and operation of reactors in practice. In this paper, an accurate analytical solution of point kinetics equations with one-group delayed neutrons and an extraneous neutron source is proposed to calculate the change in neutron density, where the whole process from the subcritical stage to critical and supercritical stages is considered for step reactivity insertions. The accurate analytical solution can also be used as a benchmark of all numerical methods employed to solve stiff neutron kinetics equations.LI HaoFeng SHANG XueLi CHEN WenZhen 2010Chinese Science Bulletin2010,55,36:3
2反中微子监测反应堆运行的数值模拟显示文摘利用反应堆出射反中微子计数监测反应堆运行,是国际上新兴的防扩散监测技术,已经过了实验检验。为研究该方法监测反应堆的能力,我们通过在现有MCNP5和MCORGS数值模拟软件中增加了蒙特卡罗方法模拟出射反中微子数目、能量和方向等信息的功能,开发出了用于模拟探测反应堆运行时出射反中微子的数值模拟软件。利用该软件我们研究了反应堆燃耗与出射反中微子计数关系、不同燃耗下铀和钚材料同位素比与出射反中微子计数关系、不同反应堆运行和换料条件下出射中子随反应堆运行时间的变化规律等问题。数值模拟结果表明,反应堆出射反中微子计数可以提供与反应堆运行情况相关的信息。朱剑钰 徐雪峰 苏佳杭 谢文雄 2016核技术2016,39,3:2
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