Reactivity feedback mechanisms in aqueous fissile solutions
Reactivity feedback mechanisms in aqueous fissile solutions
复制标题
裂变水溶液中的反应性反馈机制
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
D. Kornreich
中科院分区：
文献类型：
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作者：
D. Kornreich
在乏燃料后处理过程中经常会遇到裂变材料溶液。为了估计这些解决方案中意外临界的危害，已经开发了模型以更好地理解所涉及的动态。反应性反馈机制的准确表示是这种模型的关键部分。研究了溶液均匀体积膨胀的反应性反馈。对于更快的瞬变，密度重新分布也可能发生，因为核能的变化是组件中位置的函数。通过从ENDF/B-VI数据中创建随温度变化的截面，研究了中子谱温度反应性效应。确定CRAC、KEWB-5、SILENE和SHEBA溶液组件的体积和温度反应性反馈系数。光谱温度系数也计算中毒，未中毒，并反映钚的解决方案。反馈系数被认为是几何形状和同位素含量的组件的功能。钚的解决方案的结果同意与其他计算，这证实了在大，稀溶液的自催化漂移的可能性。
Solutions of fissile materials are often encountered during spent-fuel reprocessing. To estimate the hazards from accidental criticalities in these solutions, models have been developed to understand better the dynamics involved. Accurate representation of reactivity feedback mechanisms is a crucial part of such models. Reactivity feedback from uniform volumetric solution expansion is studied. For faster transients, density redistribution may also occur because of a variation of nuclear energy as a function of position in the assembly. Neutronic spectral temperature reactivity effects are studied by creating temperature-dependent cross sections from ENDF/B-VI data. The volumetric and temperature reactivity feedback coefficients are determined for the CRAC, KEWB-5, SILENE, and SHEBA solution assemblies. Spectral temperature coefficients are also calculated for poisoned, unpoisoned, and reflected plutonium solutions. Feedback coefficients are seen to be functions of geometry and isotopic contents of the assemblies. Results for plutonium solutions agree with other calculations, which confirms the possibility of autocatalytic excursions in large, dilute solutions.