We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux reactors.The filter burnup and singl...We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux reactors.The filter burnup and single energy burnup methods have no theoretical approximation and can achieve a spectrum resolution of up to~1 eV,thereby constructing the importance curve and yield curve of the full energy range.The burnup extreme analysis method combines the importance and yield curves to consider the influence of irradiation time on production efficiency,thereby constructing extreme curves.The three curves,which quantify the transmutation rate of the nuclei in each energy region,are of physical significance because they have similar distributions.A high-resolution neutronics model for ^(238)Pu production was established based on these three curves,and its universality and feasibility were proven.The neutronics model can guide the neutron spectrum optimization and improve the yield of ^(238)Pu by up to 18.81%.The neutronics model revealed the law of nuclei transmutation in all energy regions with high spectrum resolution,thus providing theoretical support for high-flux reactor design and irradiation production of ^(238)Pu.展开更多
以氯化物熔盐为靶基质对新型熔盐快堆中^(238)Pu的生产进行了分析,使用SCALE6.1(Standardized Computer Analyses for Licensing Evaluation Version 6.1)程序,对比了不同靶基质与靶件半径在^(238)Pu生产中237Np的转换率与利用率,分析...以氯化物熔盐为靶基质对新型熔盐快堆中^(238)Pu的生产进行了分析,使用SCALE6.1(Standardized Computer Analyses for Licensing Evaluation Version 6.1)程序,对比了不同靶基质与靶件半径在^(238)Pu生产中237Np的转换率与利用率,分析了反射层的能谱分布、不同位置辐照孔道的237Np反应截面、靶件插入对堆芯反应性的影响以及生成^(236)Pu杂质浓度,并计算了^(238)Pu的纯度及产量随辐照时间的变化。结果表明:NpCl_(4)纯盐靶基质的^(237)Np转换率较高,减小靶件半径可提高^(237)Np利用率;远离堆中心位置的辐照孔道热中子份额较高,且靶件插入对堆芯反应影响较小;辐照孔道内靶件的^(236)Pu浓度可减小至1×10^(−7)以下,^(238)Pu纯度超过98%;当辐照周期为40 d时,^(238)Pu年产量为0.8 kg,^(237)Np转换率为99.4%。展开更多
基金supported by Natural Science Foundation of China (No. 12305190)Lingchuang Research Project of China National Nuclear Corporation (CNNC)the Science and Technology on Reactor System Design Technology Laboratory
文摘We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux reactors.The filter burnup and single energy burnup methods have no theoretical approximation and can achieve a spectrum resolution of up to~1 eV,thereby constructing the importance curve and yield curve of the full energy range.The burnup extreme analysis method combines the importance and yield curves to consider the influence of irradiation time on production efficiency,thereby constructing extreme curves.The three curves,which quantify the transmutation rate of the nuclei in each energy region,are of physical significance because they have similar distributions.A high-resolution neutronics model for ^(238)Pu production was established based on these three curves,and its universality and feasibility were proven.The neutronics model can guide the neutron spectrum optimization and improve the yield of ^(238)Pu by up to 18.81%.The neutronics model revealed the law of nuclei transmutation in all energy regions with high spectrum resolution,thus providing theoretical support for high-flux reactor design and irradiation production of ^(238)Pu.
文摘以氯化物熔盐为靶基质对新型熔盐快堆中^(238)Pu的生产进行了分析,使用SCALE6.1(Standardized Computer Analyses for Licensing Evaluation Version 6.1)程序,对比了不同靶基质与靶件半径在^(238)Pu生产中237Np的转换率与利用率,分析了反射层的能谱分布、不同位置辐照孔道的237Np反应截面、靶件插入对堆芯反应性的影响以及生成^(236)Pu杂质浓度,并计算了^(238)Pu的纯度及产量随辐照时间的变化。结果表明:NpCl_(4)纯盐靶基质的^(237)Np转换率较高,减小靶件半径可提高^(237)Np利用率;远离堆中心位置的辐照孔道热中子份额较高,且靶件插入对堆芯反应影响较小;辐照孔道内靶件的^(236)Pu浓度可减小至1×10^(−7)以下,^(238)Pu纯度超过98%;当辐照周期为40 d时,^(238)Pu年产量为0.8 kg,^(237)Np转换率为99.4%。
