铅冷快堆M2LFR-1000堆芯燃料管理方案设计

堆芯燃料管理是反应堆设计中极为重要而且复杂的工作，直接影响着堆芯的经济性。目前国内外对于压水堆等传统热堆已有了较为丰富和成熟的燃料管理计算方法，但对于快堆，由于其中子能谱硬，与传统热堆相比有着不同的控制方式和功率分布，快堆的堆芯燃料管理缺乏系统研究。针对中国科学技术大学自主研发的强迫循环冷却的铅基快堆M2LFR-1000，应用SRAC/COREBN软件包进行堆芯燃耗计算，根据燃耗深度提取核素核子密度，计算伪平衡循环参数进行燃料管理预估，然后进行首循环装料、过渡循环和平衡循环燃料管理方案设计。结果表明:对M2LFR-1000堆芯外区燃料换料组件Pu的富集度进行优化，可以延长换料周期到540 d，提高平均卸料燃耗深度；伪平衡循环结果与平衡循环基本一致，伪平衡循环可以用于燃料管理预估。

In-core fuel management strategy design of lead-cooled fast reactor M2LFR-1000

Fuel management is an extremely important and complex work in reactor design and directly affects the economics of the reactor. Now, there are many mature fuel management calculation methods for PWR and other traditional thermal reactors around the world. However, because of their hard neutron spectra, control modes and power distributions of fast reactors are different from those of traditional thermal reactors. There is a lack of systematic study of fuel management for fast reactors. Based on the SRAC/COREBN software package which provides the atom density of the nuclides at different burnup levels, a pseudo-equilibrium cycle parameter was calculated for the fuel management pre-estimation of forced circulation lead cooled fast reactor M2LFR-1000 independently developed by University of Science and Technology of China. Then, refueling schemes of the initial, transition and equilibrium cycles were designed. The results show that optimizing the Pu enrichment of outer fuel assemblies in M2LFR-1000 core can extend the cycle length to 540 d and increase the average discharge burnup. The pseudo-equilibrium cycle results are basically the same as those of the equilibrium cycle. The pseudo-equilibrium cycle can be used for fuel management pre-estimation.