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首页> 外文期刊>Annals of nuclear energy >Three-dimensional pin power reconstruction for the axially heterogeneous region in BWR
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Three-dimensional pin power reconstruction for the axially heterogeneous region in BWR

机译：BWR轴向异质区域的三维引脚功率重构

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摘要

A three-dimensional pin power reconstruction method was proposed and verified by applying to the axially heterogeneous region problem of the BWR core calculation. Because the production assembly calculation has been carried out by two-dimensional deterministic calculation methods like current coupling collision probability or the method of characteristics, it has been difficult to predict the detailed three-dimensional heterogeneous pin power distribution of the axially heterogeneous region. Consequently, only radial intran-odal homogeneous power distributions have been considered, and axial intranodal homogeneous power distributions have not been considered in the estimation of linear-heat-generation-ratio at common BWR core calculations. For an axially heterogeneous region in which two different nodes are combined, the Monte Carlo calculation method can execute three-dimensional heterogeneous assembly calculation directly. By taking advantage of this point, we proposed a three-dimensional pin power reconstruction method. The present three-dimensional pin power reconstruction method was applied to the control-rod-tip (CRT) region problem in BWR. The validity of this method was verified from the result obtained, in which the relative bundle-averaged three-dimensional pin power distribution was improved about 5% of RMS over without three-dimensional pin power reconstruction method.
机译：提出了一种三维销钉功率重构方法，并将其应用于BWR堆芯计算的轴向异质区域问题。由于已经通过诸如电流耦合碰撞概率或特性方法之类的二维确定性计算方法进行了生产装配计算，因此很难预测轴向异质区域的详细三维异质销功率分布。因此，在通常的BWR堆芯计算中，在估算线性发热比时，仅考虑了径向向内均匀功率分布，而未考虑轴向节点内均匀功率分布。对于其中两个不同节点组合在一起的轴向异质区域，蒙特卡洛计算方法可以直接执行三维异质装配计算。利用这一点，我们提出了一种三维引脚功率重构方法。目前的三维引脚功率重构方法已应用于BWR中的控制棒尖端（CRT）区域问题。从所获得的结果证实了该方法的有效性，其中相对于束平均的三维引脚功率分布相比于没有三维引脚功率重建方法的情况，其平均RMS值提高了约5％。

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