The effective fuel temperature to be used for calculating resonance absorption in a 238UO2 lump with a nonuniform temperature profile
The effective fuel temperature to be used for calculating resonance absorption in a 238UO2 lump with a nonuniform temperature profile
复制标题
用于计算具有不均匀温度分布的 238UO2 块中的共振吸收的有效燃料温度
DOI：
10.13182/nse94-108
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
A. J. Janssen
中科院分区：
文献类型：
--
作者：
W. J. M. de Kruijf;A. J. Janssen
计算了{sup 238}UO{sub 2}平板和销钉中简单温度分布的共振吸收，以显示非均匀燃料温度分布对等效均匀温度或有效燃料温度选择的影响。有效燃料温度作为燃料区中温度的加权平均值给出。两个简单的理论表达式，这个加权平均值，来自文献，进行了讨论。首先，对于高吸收，有效燃油温度由所谓的弦平均燃油温度给出。其次，对于低吸收，有效燃料温度由体积平均燃料温度给出。{sup 238}UO{sub 2}板的结果表明，必须采用蛮力法来计算准确的有效燃料温度。计算一个特定{sup 238}UO{sub 2}引脚的一组权重。该设定值与弦平均燃油温度一致。然而，这似乎是一个巧合，因为特定的中子能量范围的结果不同意这套权重。
Calculations of resonance absorption for simple temperature profiles both in a slab and in a pin of {sup 238}UO{sub 2} are presented to show the influence of a nonuniform fuel temperature profile on the choice of the equivalent uniform temperature, or the effective fuel temperature. The effective fuel temperature is given as a weighted average of the temperatures in the fuel zones. Two simple theoretical expressions for this weighted average, derived from the literature, are discussed. First, for high absorption, the effective fuel temperature is given by the so-called chord-averaged fuel temperature. Second, for low absorption, the effective fuel temperature is given by the volume-averaged fuel temperature. The results for a slab of {sup 238}UO{sub 2} show that a brute-force method is necessary to calculate an accurate effective fuel temperature. A set of weights for one specific {sup 238}UO{sub 2} pin is calculated. This set agrees well with the chord-averaged fuel temperature. However, this appears to be a coincidence because the results for specific neutron energy ranges do not agree with this set of weights.