Abstract
The effect of secondary side water level of steam generator (SG) on the single-phase reverse flow in inverted U-tube steam generator (UTSG) is analyzed based on the one-dimension flow model, applying the small perturbation theory. The pressure drop-mass flow rate curve of inverted U-tube in SG with abnormal secondary side water level is obtained according to the flow model. There is a negative slope on the curve where the single-phase reverse flow can occur. The characteristic mass flow rate and characteristic pressure drop of different secondary side water level of UTSG are compared, and the results show that the single-phase reverse flow will occur more easily when the secondary side water level of UTSG falls. Meanwhile, for the smaller UTSG, the secondary side water level of UTSG can influence the space distribution of the single-phase reverse flow, for the larger UTSG, the single-phase reverse flow always occurs firstly in the longest inverted U-tube. Furthermore, the analytical results are validated by the simulation results of RELAP5/MOD3.2 based on the experiment.
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