论文标题
VVER杆束中CHF预测的一种方法
A Methodology for CHF Prediction in VVER Rod Bundles
论文作者
论文摘要
临界热通量（CHF）是一个重要的热液压参数，必须在设计水冷反应器时确定，以确保操作安全。在本文中，提出了一种方法来预测Vver杆束中的CHF。 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.对Groeneveld和Bobkov Luts的校正因子进行了简短的批评。还研究了河道直径和非均匀轴向热通量对子冷冻条件下CHF预测值的影响。评估了标准和伯克三联插值算法的性能和时间复杂性，以在安全法规中与LUT一起使用。得出的结论是，在子冷冻条件下，非均匀的轴向热通量不会影响CHF，并且Groeneveld直径因子指数指数可以更好地可预测VVER杆束中CHF的可预测性。此外，在与Bobkov加热长度因子结合使用时，发现Groeneveld LUT几乎可以再现Bobkov Lut CHF值。当弓箭和W-3相关性分别在子冷冻条件下使用时，MDNBR的值等于1.83和1.96的值可以用作12 \％的热极限。标准和伯克算法几乎显示出相同的平均CPU时间。但是，Bourke算法受噪声的影响较小。需要进一步的研究以确保Bobkov LUT的平稳性并得出反应堆类型依赖性校正因子公式，以与Groeneveld LUT一起使用。
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.
