快速ADS中估计keff的另一种可观测量
An alternative observable to estimate keff in fast ADS
摘要：
在本文中，我们研究了另一种方法来确定中子增殖因子keff在快次临界反应堆，根据可观察到的中子通量的“快"的组成部分（在这种情况下，我们的意思是中子与动能以上0.5 MeV）和整个通量在所有能量之间的比率计算。本研究背后的假设是，上述可观测值将仅对keff敏感，前提是考虑外围燃料棒（即远离亚临界系统中的中子源）并且keff足够高。事实上，我们的结果表明，对于keff> 0.7，LFR或GFR模型计算的比率结果显示出非常相似的趋势，可以很好地近似为直线，而钠反应堆则观察到不同的斜率。在我们看来，所获得的结果表明，这样的观察，适当的校准后，在考虑中的实际系统，可用于确定keff在所有的操作条件下，特别是对于亚临界系统与不同类型的中子源和不同值的束流。
英文摘要：
In this paper we examine an alternative method for determining the neutron multiplication factor keff in fast subcritical reactors, based on the observable obtained by calculating the ratio between the ``fast`` component of the neutron flux (in this case by fast we mean neutrons with kinetic energy above 0.5 MeV) and the whole flux at all energies. The assumption behind the present study was that the above mentioned observable would be only sensitive to keff, provided a peripheral fuel rod is considered (i.e. far from the neutron source in subcritical systems) and keff is sufficiently high. Indeed, our results show that, for keff> 0.7, the ratio calculated for LFR or GFR models turns out to show a quite similar trend well approximated by a straight line, while a different slope is observed for a sodium reactor. In our opinion, the results obtained show that such observable, after appropriate calibrations on the real systems under consideration, may be used for determining keff in all operational conditions, in particular for subcritical systems with different types of neutron source and different values of the beam current.
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