反射层对铀氢锆反应堆脉冲行为的影响研究

发布时间：2019-03-01 13:29

【摘要】：对于反射层价值相对较大的小型铀氢锆反应堆,反射层对脉冲动力学行为产生的影响不应忽略。为描述该影响,基于Cohn两点动力学模型建立了严格区分堆芯中子和反射层中子的两点脉冲模型,结合具体算例与单点脉冲模型和采用瞬发中子有效寿命修正的单点脉冲模型进行比较。3种模型中单点脉冲模型仅适用于反射层极薄的特殊情况,其结果在大多数情况下与另两种模型有显著差异;修正的单点脉冲模型的结果在大多数情况下接近两点脉冲模型,但由于未考虑堆芯中子和反射层中子随时间变化的非同步性,因而在反射层较厚、引入初始反应性较大的情况下与两点脉冲模型存在明显差异;两点脉冲模型严格区分了堆芯中子和反射层中子,在小型铀氢锆堆的脉冲行为分析和引入巨大正反应性的严重事故分析时应使用此模型。
[Abstract]:For small-sized uranium-zirconium hydrogen-zirconium reactors with relatively large reflector value, the effect of reflector on pulse dynamic behavior should not be ignored. In order to describe the effect, a two-point pulse model based on the Cohn two-point dynamic model is established to distinguish the neutron from the reflector neutron strictly. Compared with the single-point pulse model and the single-point pulse model modified by instantaneous neutron effective life, the single-point pulse model of the three models is only suitable for the special case of very thin reflection layer, in which the single-point pulse model is compared with the single-point pulse model. In most cases, the results are significantly different from the other two models. The results of the modified single-point pulse model approach to the two-point pulse model in most cases, but due to the non-synchronization of the core neutron and the reflector neutron over time, the reflection layer is thicker. When the initial reactivity is large, there is obvious difference between the two-point pulse model and that of the two-point pulse model. The two-point pulse model strictly distinguishes the core neutron from the reflector neutron, which should be used to analyze the pulse behavior of the small uranium-zirconium hydrogen-zirconium reactor and the analysis of serious accidents in which huge positive reactivity is introduced.
【作者单位】：中国原子能科学研究院反应堆工程技术研究部;
【分类号】：TL327

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