预测VVER棒束中CHF的方法
A Methodology for CHF Prediction in VVER Rod Bundles
摘要：
临界热流密度（CHF）是水冷堆设计中必须确定的重要热工水力参数，以保证安全运行。本文提出了一种预测VVER棒束CHF的方法。在RELAP-SCDAPSIM中实现了VVER-1000的全堆模型，并且基于平均法，使用热通道的参数来评估四个CHF预测因子（即，2006年Groeneveld查找表（LUT）和Bowring、W-3、Biasi和OKB-Gidropress相关性）与2011年Bobkov LUT进行比较。一个简短的评论给出了Groeneveld和Bobkov LUT的校正因子。研究了通道直径和非均匀轴向热流密度对过冷工况下CHF预测值的影响。标准和Bourke三线性插值算法的性能和时间复杂度进行评估，用于安全代码中的LUT。它已得出的结论是，不均匀的轴向热通量不影响CHF在过冷条件下，Groeneveld直径因子指数提供了更好的预测CHF在VVER棒束的Tanase和黄指数的相关性。此外，已发现Groeneveld LUT与Bobkov加热长度因子结合使用时几乎再现Bobkov LUT CHF值。当在过冷条件下分别使用Bowring和W-3关联式时，MDNBR值等于1.83和1.96可用作12%过功率下的热极限。标准算法和Bourke算法的平均CPU时间几乎相同。然而，Bourke算法受噪声的影响较小。需要进一步的研究，以确保Bobkov LUT的平滑性，并推导出与Groeneveld LUT一起使用的反应堆类型相关的校正因子公式。
英文摘要：
The critical heat flux (CHF) is an important thermal-hydraulic parameter that must be determined during the design of water-cooled reactors to ensure safety of operation. In this paper, a methodology is proposed to predict the CHF in VVER rod bundles. A whole-reactor model of VVER-1000 is implemented in RELAP-SCDAPSIM, and, based on the bundle-average approach, the parameters of the hot channel are used to assess four CHF predictors (i.e., the 2006 Groeneveld look-up table (LUT), and the Bowring, W-3, Biasi, and OKB-Gidropress correlations) upon comparison with the 2011 Bobkov LUT. A brief critique is given of the correction factors for both the Groeneveld and Bobkov LUTs. The effects of channel diameter and non-uniform axial heat flux on the predicted values of CHF in subcooled conditions are also studied. The performance and time complexity of the standard and Bourke trilinear interpolation algorithms are assessed for use with LUTs in safety codes. It has been concluded that the non-uniform axial heat flux does not affect the CHF in subcooled conditions and that the Groeneveld diameter factor exponent gives better predictability of the CHF in VVER rod bundles over the Tanase and Wong exponent correlations. Additionally, the Groeneveld LUT has been found to nearly reproduces the Bobkov LUT CHF values when used in conjunction with the Bobkov heated length factor. Values of MDNBR equal to 1.83 and 1.96 can be used as thermal limits at 12\% overpower when the Bowring and W-3 correlations, respectively, are used in subcooled conditions. The standard and Bourke algorithms nearly exhibit the same average CPU time. The Bourke algorithm, however, is less affected by noise. Further research is needed to ensure the smoothness of the Bobkov LUT and to derive reactor type-dependent correction factor formulas for use with the Groeneveld LUT.
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