V. V. Opyatyuk, I. Kozlov, K. Karchev, S. V. Vistiak, O. I. Kozlov, R. Turmanidze
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引用次数: 1
摘要
本文研究了影响以铀为燃料介质的核动力波堆运行的点缺陷。形成的单个点缺陷或缺陷群会对核反应堆运行模式的稳定性产生扰动作用,并使其过渡到不稳定状态。研究了二维几何介质中中子倍增对核爆波特性的影响。计算中考虑了铀钍裂变介质。用不同的铀富集率和不同的中子活化能值进行了参数计算。据此,假设波(流)堆稳定运行区域位于10-3 eV ~ 1 eV活化能范围内或2 MeV ~ 8 MeV区域内。在计算波堆中子通量强度时,考虑了点缺陷及其聚集对减速弹性散射中子通量密度和减速非弹性散射中子通量密度的影响。得到了几种铀钍介质组成中点缺陷形成率与介质裂变温度的关系。从视觉上看,在计算过程中获得的图形材料与能源运动后的燃料棒照片相似。
Simulation of Point Defects Formation in the Fuel Element
of a Nuclear Power Plant’s Wave Reactor
This paper considers the point defects that influence the operation of a wav nuclear power reactor with a uranium fuel medium. The formed individual point defects or such defect groups can produce a perturbing effect on the stability of the nuclear reactor operating mode and involve its transition to an unstable state. Studies have been carried out on the effect on the characteristics of the nuclear burnup wave in a medium with neutron multiplication for 2D geometry. For the calculation, the uranium-thorium fissile medium has been considered. The parametric calculations were carried out with 235 U different enrichment percents and different values of neutron activation energy. At that, it was assumed that the wave (flow) reactor stable operation region is located in the range of activation energies from 10–3 eV to 1 eV or in the region from 2 MeV to 8 MeV. When calculating the neutron flux intensity in a wave reactor, the influence of point defects and their aggregates on the decelerating elastically scattered neutrons’ flux density and the flux density of decelerating non-elastically scattered neutrons was considered. The dependences of the point defects formation rate on the medium fissile temperature for several compositions of the uranium-thorium medium are obtained. As visually identified, the graphic materials obtained during the calculations are similar to the photos of fuel rods after the energy campaign.