【摘要】：對于反射層價值相對較大的小型鈾氫鋯反應(yīng)堆,反射層對脈沖動力學(xué)行為產(chǎn)生的影響不應(yīng)忽略。為描述該影響,基于Cohn兩點動力學(xué)模型建立了嚴(yán)格區(qū)分堆芯中子和反射層中子的兩點脈沖模型,結(jié)合具體算例與單點脈沖模型和采用瞬發(fā)中子有效壽命修正的單點脈沖模型進(jìn)行比較。3種模型中單點脈沖模型僅適用于反射層極薄的特殊情況,其結(jié)果在大多數(shù)情況下與另兩種模型有顯著差異;修正的單點脈沖模型的結(jié)果在大多數(shù)情況下接近兩點脈沖模型,但由于未考慮堆芯中子和反射層中子隨時間變化的非同步性,因而在反射層較厚、引入初始反應(yīng)性較大的情況下與兩點脈沖模型存在明顯差異;兩點脈沖模型嚴(yán)格區(qū)分了堆芯中子和反射層中子,在小型鈾氫鋯堆的脈沖行為分析和引入巨大正反應(yīng)性的嚴(yán)重事故分析時應(yīng)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.
【作者單位】： 中國原子能科學(xué)研究院反應(yīng)堆工程技術(shù)研究部;
【分類號】：TL327

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