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寿期内中子通量、核素浓度和功率分布的轴向形状均保持恒定(Constant Axial shape of Neutron flux,nuclide densities and power shape During Life of Energy produced,CANDLE)是实现原位增殖-焚烧(Breed-and-Burn,B&B)模式的一种燃耗策略。CANDLE堆经易裂变燃料或外中子源进行点火,启动后由增殖燃料的燃烧实现自稳运行。若要CANDLE堆自稳运行于k_(eff)=1,必须对堆芯几何及燃料体积分数进行配置优化。最优配置方案可通过蒙特卡罗方法模拟CANDLE堆芯,根据有效增殖因子筛选得出。但该方法需耗费大量的计算时间,若采用1D模型近似模拟,并结合中子平衡方法进行分析,便可大幅节约计算时间,获得具有指导性意义的结果。本文将论证该方法的可行性,并应用该方法估算钠冷贫铀CANDLE堆半径在100 400 cm、燃料体积分数在35%60%变化时的最优配置。
Constant Axial shape of Neutron flux, nuclide densities and power shape During Life of Energy produced, CANDLE, is the result of in-situ multiplication-incineration ( Breed-and-Burn, B & B) mode. The CANDLE stack is ignited by a fissile fuel or an external neutron source and started to run self-sustaining by the combustion of the multiplication fuel. To run CANDLE autonomously at k eff (eff) = 1, core geometry and fuel volume fraction must be optimized for configuration. The optimal configuration can be simulated by Monte Carlo method CANDLE core, based on the effective proliferation factor screening. However, this method requires a large amount of computation time. If using 1D model approximate simulation and neutron balancing method to analyze, the method can greatly save the calculation time and obtain the instructional result. This article will demonstrate the feasibility of this method and apply this method to estimate the optimum configuration for a CANDLE stack with a radius of 100 400 cm and a fuel volume fraction of 35% 60%.