Transient Criticality in Fissile Solutions—Compressibility Effects

Transient Criticality in Fissile Solutions—Compressibility Effects
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裂变溶液中的瞬态临界——压缩性效应

DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. Umpleby
A. Umpleby
中科院分区：
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文献类型：
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作者：
C. Pain;C. D. de Oliveira;A. Goddard;A. Umpleby

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摘要描述了在有限元瞬变临界性(FETCH)耦合中子学/计算流体动力学程序中加入液体和辐射分解气相的可压缩效应的研究。该程序是为模拟多相介质中的临界性瞬变而开发的，并被应用于裂变溶液的瞬变临界性。通过改进的数值模型获得的裂变和压力瞬变的预测结果与Silene关于铀溶液中临界瞬变的系列实验的结果进行了基准比较。较好地描述了阶跃反应性变化后第一个压力峰的幅度和形状，并对随后的压力振荡形式有了深入的了解。给出了在更高能量的瞬变中没有这些振荡的解释。
Abstract Research on the incorporation of compressibility effects, for both the liquid and radiolytic gas phases, into the Finite Element Transient Criticality (FETCH) coupled neutronics/computational fluid dynamics code is described. The code has been developed to simulate criticality transients in multiphase media and is applied here to fissile solution transient criticality. The predicted fission and pressure transients obtained by the enhanced numerical model are benchmarked against the results from the SILENE series of experiments on criticality transients in uranium solutions. The amplitude and the form of the first pressure peak, following a step reactivity change, are well represented, and insight is gained into the form of subsequent pressure oscillations. An explanation is given on the absence of these oscillations in more energetic transients.