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研究设计了基于中国实验快堆(China Experimental Fast Reactor,CEFR)的小型“行波”概念堆。采用中子输运程序MCNP和点燃耗程序ORIGEN2的耦合程序进行堆芯设计,重点研究了不同点火组件的富集度和不同布料方案对小型堆的物理参数的影响,设计堆芯寿期为30 a,并给出相应的倒料方案。不同点火组件富集度对比结果表明,小堆需要选取合适的富集度,富集度太低无法维持临界,而太高会影响堆芯增殖效应;而低泄漏和棋盘式布料两种方式对比结果表明,后者的增殖组件增殖效应明显高于前者。最终确定倒料周期为8 a,倒料三次,堆芯实现较长寿期,且整个寿期内反应性变化小,各组件燃耗深度相对均匀,组件平均卸料燃耗深度约为238 MWD/kg HM。
A small “traveling wave” concept reactor based on the China Experimental Fast Reactor (CEFR) was studied and designed. The core design was carried out by using the coupling program of neutron transport program MCNP and ORIGEN2, focusing on the enrichment of different ignition components and the influence of different fabric schemes on the physical parameters of small piles. The designed core lifetime was 30 a, and give the corresponding repacking plan. The comparison of the enrichment of different ignition components shows that the small heap needs to select the appropriate enrichment, the enrichment is too low can not maintain the critical, and too high will affect the core proliferation effect; and low leakage and checkerboard fabric two ways The results showed that the proliferation of proliferative components of the latter was significantly higher than the former. The final reflow cycle was 8 a, the backfill three times, the core to achieve a longer life, and the entire life cycle less change in response, the fuel burn depth of each component is relatively uniform, the average component fuel burn depth of about 238 MWD / kg HM.