基于多维响应矩阵的中子能谱逆向调控方法及应用

Neutron Spectrum Reverse Regulation Method Based on Multidimensional Response Matrix and Its Application

中子能谱是影响核能系统安全性和经济性的重要参数,先进核能系统种类繁多,能谱差异大,准确的调控出先进核能系统的能谱对其发展有重要意义.本文利用基于响应矩阵的中子能谱逆向调控方法,以14MeV单能的聚变中子源为例,调控出聚变堆氚增殖包层、聚变裂变混合堆次临界包层、铅基快堆堆芯处的中子能谱,调控得到的中子能谱与目标能谱吻合较好,其中聚变堆氚增殖包层处的中子能谱与FNG上 Mockup实验能谱比较,归一化能谱均方差降低了66%.对比结果表明本文方法能够实现多种类型先进核能系统中子能谱的精准调控.

Neutron spectrum is an import parameter affecting the safety and economy of nuclear system.There are many types of advanced nuclear systems,and their spectrums are differing greatly.It is very important to regulate the energy spectrum of advanced nuclear systems accurately.An inverse regulation method of neutron spectrum based on response matrix is presented in this paper,at the same time,the neutron spectrum at the tritium breeder blanket of fusion reactor,the subcritical blanket of fusion-fission hybrid reactor and the core of lead-based fast reactor is regulated from the 14 MeV fusion neutron source.The regulation neutron spectrum is agrees well with the target spectrum,the normalized mean variance of the neutron spectrum at tritium breeder blanket of fusion reactor is 66% lower than that of the mock up experimental spectrum on FNG.It is shown that the proposed method can accurately regulate the neutron spectra of various types of advanced nuclear systems.