Accident tolerant fuel thermal hydraulic behaviors evaluation during loss of coolant accident in CPR1000

Yu, Honghao; Chen, Zhijie; Cai, Jiejin

doi:10.1016/j.anucene.2019.107273

Cited by 8 publications

(1 citation statement)

References 33 publications

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“…Flashing also occurs in the event of damage or leakage of cooling pipes, pressure pipes, and other equipment [5]. The Loss of Coolant Accident (LOCA) is a particularly common type of accident in nuclear power plants, wherein a rupture of the pipe causes a reduction in the coolant load of the circuit [6]. Due to the high-temperature and high-pressure conditions of the first circuit, a large amount of coolant and steam are released from the breach when flashing occurs, forming a complex gas-liquid two-phase flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flashing Flows in a Converging–Diverging Nozzle with Interfacial Area Transport Equation

Liao

Zhou

et al. 2023

Processes

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Flashing flows of initially sub-cooled water in a converging–diverging nozzle is investigated numerically in the framework of the two-fluid model (TFM). The thermal non-equilibrium effect of phase change is considered by an interfacial heat transfer model, while the pressure jump across the interface is ignored. The bubble size distribution induced by nucleation, bubble growth/shrinkage, coalescence, and breakup is described based on the interfacial area transport equation (IATE) and constant bubble number density model (CBND), respectively. The results are compared with the experimental data. Satisfactory prediction of the axial pressure distribution along the nozzle as well as the flashing inception, is achieved by the TFM-IATE coupling method. It was also found that the vapor production in the diverging section was overpredicted, and the radial gas volume fraction distribution deviated from the experiment. The radial diameter profiles exhibit opposite patterns at the nozzle throat and near the outlet, and similar trends can be observed for the superheated degree. A poly-disperse method is suggested to be introduced to describe the evolution of interfacial area concentration.

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Section: Introductionmentioning

confidence: 99%