A phenomenological CHF model for mixing-vane spacers in a subchannel of a rod bundle

Liu, Yang; Dong, Siying; Shan, Jianqiang; Zhang, Bo; Jiang, Li; Liu, Wei; Leung, Lydie

doi:10.1016/j.anucene.2020.107445

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…The local thermal-hydraulic parameters in the 5 × 5 rod bundle of each CHF test series are calculated with the subchannel code CORTH (Liu et al, 2017), which was developed in NPIC for thermal-hydraulic analysis of reactor cores and experimental facilities with heating rod bundles. The rod bundle specific effects such as heating length, mixing strength, cold wall, and axial nonuniform heating are considered to account properly for the calculation of rod bundle local parameters (Dong et al, 2018;Liu et al, 2020a).…”

Section: Calculation Methodsmentioning

confidence: 99%

Investigation on Rod Bundle CHF Mechanistic Model for DNB and DO Prediction Under Wide Parameter Range

et al. 2021

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For a water cooled reactor, the key thermal-hydraulic parameters span a wide range corresponding to different CHF regimes. Under accident conditions, due to the flow regime transition and interchannel mixing effect, the corresponding CHF can transition from the DO to DNB regime. In order to continuously and accurately predict DNB and DO regime CHF under wide parameter range for rod bundle channel, a comprehensive CHF mechanistic model covering the DNB and DO regime CHF prediction is established based on the rod bundle CHF-regime criterion. The DNB regime CHF mechanistic model of superheated liquid layer depletion under turbulence fluctuation bubbles and the mature DO regime CHF mechanistic model are combined to form the comprehensive CHF model. Furthermore, the comprehensive CHF model is assessed by 5 × 5 rod bundle CHF experimental data independently obtained by the Nuclear Power Institute of China (NPIC). The statistical evaluation and parametric trend analysis show that the maximum mean error of P/M is within ±22%, and the local pressure, mass flux, and quality do not have any effects on the average deviations of the predicted flux P from the measured flux M. This indicates that the comprehensive CHF mechanistic model can accurately and continuously predict the DNB and DO regime CHF in the rod bundle channel.

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Section: Calculation Methodsmentioning

confidence: 99%