中文摘要：

为满足中国实验快堆（CEFR）物理启动的经济性需要,研究二次中子源替代堆内的^252Cf一次中子源的可行性。参照CEFR的相关参数及二次中子源产生中子的原理,设计了二次中子源。用MCNP程序模拟计算了二次中子源组件中^123Sb的（n,γ）核反应率和9Be的（γ,n）单核反应率,得出二次中子源组件在不同工况辐照下的源强,分析其在CEFR中应用的可行性。计算结果表明,在大多数工况下,所设计的二次中子源组件能满足CEFR的启动要求。本文所设计的二次中子源及计算结果可为CEFR二次中子源的应用提供参考。

英文摘要：

To improve economic efficiency during the physical start-up of China Experi- mental Fast Reactor （CEFR）, the feasibility of using secondary neutron source to replace 252Cf source was studied. The secondary neutron source was designed based on the principle of neutron generation of secondary source and with reference to relevant CEFR parameters. 123Sb （n, 3＇） reaction rate and 9Be single nucleon （3＇, n） reaction rate in the secondary source assembly were calculated by using MCNP code, and source strengths in different exposure conditions were obtained. Then the feasibility of applying the secondary source in CEFR physical start-up was analyzed. The calculation results show that the designed secondary neuron source assembly can meet the require- ments of CEFR start-up in most operating conditions. The secondary neutron source designed in this paper and the calculation results can provide useful data for the application of secondary neutron source in CEFR start-up.