反中微子监测反应堆运行的数值模拟

Numerical simulation on monitoring nuclear reactor by anti-neutrino

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。

Background： Anti-neutrino detection, a promising tool for nuclear reactor monitoring by International Atomic Energy Agency （IAEA）, is tested by several experiments. The effectiveness and limitation of the method should be studied by numerical simulations. Purpose： The aim is to study the effectiveness and limitation of monitoring nuclear reactor by anti-neutrino detection. Methods： A code was developed to calculate the counting of anti-neutrino generated by nuclear reactor based on MCNP code. The anti-neutron counting was simulated and analyzed with various nuclear reactor operation modes. Results： The anti-neutrino counting was related to the burn-up and isotope abundances of the reactor. Conclusion： It is possible to provide useful evidence on reactor operation to detect the count of anti-neutrino emitted by the reactor.