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首页> 外文会议>International conference on the physics of reactors;PHYSOR 2010 >EFFECT OF VOID DEPENDENT REACTIVITY MODELING BIAS ON BWR AXIAL POWER TILT
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EFFECT OF VOID DEPENDENT REACTIVITY MODELING BIAS ON BWR AXIAL POWER TILT

机译：无效相关反应性建模偏差对BWR轴向功率倾斜的影响

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Inspired by a Pennsylvania State University study reported in the PHYSOR08 conference related to BWR axial power tilt, an investigation is made as to if there could be any intrinsic deficiency in the conventional nodal diffusion theory leading to a tilt in BWR axial power prediction. It is found that the two-group nodal diffusion theory itself does not cause axial power tilt compared to multi-group deterministic 3D transport calculation. However, the usual practice of flat source approximation in 2D lattice codes based on the Collision Probability (CP) method or the Method of Characteristics (MOC) can cause a void dependent reactivity bias when used to generate the node homogenized cross-sections, if the same geometry meshing modeling is used for all the axial sections over which the void fraction varies severely. The reactivity bias can be removed by using lattice code models based on S_N method or MOC method with linear instead of flat source approximation. In absence of the void dependent reactivity bias, there is no axial power tilt between two-group nodal diffusion calculation and multi-group deterministic 3D transport calculation. Therefore there is no intrinsic deficiency in the nodal diffusion theory that causes BWR axial power tilt. But one has to be careful with using the flat source approximation and the generic-meshing modeling in generating homogenized nodal diffusion cross-sections for high void cases. As for any possible axial power tilt between multi-group deterministic 3D transport calculation and continuous energy Monte Carlo 3D simulation, that would be a different issue.
机译：受宾夕法尼亚州立大学在PHYSOR08会议上报告的与BWR轴向功率倾斜有关的研究的启发，对传统的节点扩散理论是否存在导致BWR轴向功率预测倾斜的固有缺陷进行了调查。已经发现，与多组确定性3D传输计算相比，两组节点扩散理论本身不会引起轴向功率倾斜。但是，基于碰撞概率（CP）方法或特征方法（MOC）的2D晶格代码中平源近似的常规做法在用于生成节点均化横截面时会导致孔隙依赖性反应性偏差，如果对于所有空隙率严重变化的轴向截面，都使用相同的几何网格化建模。可以通过使用基于S_N方法或MOC方法的具有线性而不是平坦源近似的晶格代码模型来消除反应性偏差。在没有依赖于孔隙的反应性偏差的情况下，两组节点扩散计算与多组确定性3D传输计算之间没有轴向功率倾斜。因此，在节点扩散理论中没有导致BWR轴向功率倾斜的内在缺陷。但是，在为高孔隙率情况生成均匀化的节点扩散截面时，必须谨慎使用平面源近似和通用网格建模。至于多组确定性3D传输计算与连续能量蒙特卡洛3D模拟之间的任何可能的轴向功率倾斜，那将是一个不同的问题。

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