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首页> 外文期刊>World Journal of Nuclear Science and Technology >MCNP Simulation of Physics Parameters of Dispersion Fuels for Conversion of NIRR-1 to LEU
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MCNP Simulation of Physics Parameters of Dispersion Fuels for Conversion of NIRR-1 to LEU

机译：用于将NIRR-1转换为LEU的分散燃料物理参数的MCNP模拟

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The Nigeria Research Reactor-1 (NIRR-1) is one of the Commercial Miniature Neutron Source Reactors (MNSRs) sited outside China and scheduled for conversion under the auspices of Reduced Enrichment for Research and Test Reactors (RERTR) program. Since 2006, the reduction in the fuel enrichment of MSNR facilities from greater than 90% HEU cores to less than 20% LEU cores has been embarked upon. Consequently in this work, the physics parameters of three dispersion LEU fuels, which include U3Si, U3Si2, and U9Mo enriched to 19.75% were determined by the MCNP code to investigate their suitability for the conversion of NIRR-1 to LEU. The following reactor core physics parameters were computed for the LEU fuel options: clean cold core excess reactivity (ρex), control rod (CR) worth, shut down margin (SDM), neutron flux distributions in the irradiation channels and kinetics data (i.e. effective delayed neutron fraction, style="white-space:nowrap;"> style="white-space:nowrap;">βeff?and prompt neutron lifetime, lf). Results are compared with experimental and calculated data of the current HEU core and indicate that it would be feasible to use any of the LEU options for the conversion of commercial MNSR in general and NIRR-1 in particular from HEU to LEU.
机译：尼日利亚研究堆1号（NIRR-1）是位于中国境外的商业微型中子源反应堆（MNSR）之一，计划在研究和试验堆减少浓缩（RERTR）计划的主持下进行转换。自2006年以来，已着手将MSNR设施的燃料富集度从大于90％的HEU核芯减少至小于20％的LEU核芯。因此，在这项工作中，三种分散型LEU燃料的物理参数包括U 3 Si，U 3 Si 2 和U 9 Mo富集至19.75％，以研究其是否适合将NIRR-1转化为LEU。针对LEU燃料选项，计算了以下反应堆堆芯物理参数：清洁冷堆芯过剩反应性（ρ ex ），控制棒（CR）值，关闭余量（SDM），辐照通道中的中子通量分布和动力学数据（ ie 有效延迟中子分数， style =“ white-space：nowrap;”> < span style =“ white-space：nowrap;”>β eff？ ，并提示中子寿命， l f ）。将结果与当前HEU核的实验和计算数据进行比较，表明使用任何LEU选项进行商业MNSR转换，尤其是将NIRR-1尤其是从HEU转换为LEU是可行的。

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