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KMID : 0371819980300050424
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Nuclear Engineering and Technology
1998 Volume.30 No. 5 p.424 ~ p.434
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The Simulation of Semicale Natural Circulation Test S-NC-3, S-NC-4 Using RELAP5/Mod3.1
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Kim S.N.
Jang W.H.
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Abstract
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RELAP5/Mod3.1 code was assessed with the semiscale experiment S-NC-3, and SNC-4, which simulated the two-phase natural circulation and reflux condensation for the SBLOCA of PWR, respectively. Test S-NC-3 and S-NC-4 calculation results showed that RELAP5/Mod3.1 quite well describes the influence of steam generator secondary side heat transfer degradation on both two-phase natural circulation and reflux condensation. A comparison between the calculated and measured two-phase mass flow rate in test SNC-3 shows good-agreement for primary mass inventory more than 92%. And RELAP5/Mod3.1 have a good mass flow rate prediction capability for the transient such as S-NC-4 except some flow oscillations. The reflux flow rate for S-NC-4 test is under predicted, and the overall results verify that the correct prediction of the reduced liquid level appears to be required for the correct calculation of the overall phenomena.
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