Assessment of MIT and UCB wall condensation tests and of the pre-release RELAP5/MOD3.2 code condensation models

Shumway, R.W.

doi:10.2172/34423

Cited by 3 publications

(3 citation statements)

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“…The two systems consist of vertical tubes heat exchangers (outer diameter is 50.8 mm) immersed in compartmentalized water pools. The PCCS operates at low pressure (0.31 MPa) while the IC system at high pressure (7.18 MPa) (Shumway, 1995).…”

Section: Film Condensation In Vertical Tubesmentioning

confidence: 99%

“…An overall number of 42 runs were carried out with pure steam. The experiment was focused on the characterization of the steam condensation within a vertical tube, adjusting the pressure in a range relevant for a PCCS and the steam flow rate in the range of 30-60 kg/h (Shumway, 1995;Kuhn et al, 1997).…”

Section: Film Condensation In Vertical Tubesmentioning

confidence: 99%

“…In addition, cooling water bulk temperature is measured by TCs mounted at the inlet and outlet pipes and a movable thermocouple probe is installed to acquire vapor centerline temperature at different axial levels (Kuhn et al, 1997). The experimental uncertainties are reported by Shumway (1995). Uncertainty related to the temperature measurement at the inlet of the test section is evaluated equal to ±0.99 K and heat flux uncertainty is ±10.4 %.…”

Section: Film Condensation In Vertical Tubesmentioning

confidence: 99%

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Improvements of RELAP5/Mod3.3 heat transfer capabilities for simulation of in-pool passive power removal systems

Narcisi

Melchiorri

Giannetti

2021

Annals of Nuclear Energy

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Despite system thermal-hydraulic codes were extensively validated for transient simulations of LWR, several activities highlighted limited capabilities of these tools to model heat transfer within in-pool passive power removal system. Discrepancies with experimental results were related to the underestimate of pool boiling and film condensation heat transfer coefficients. Thus, the DIAEE of "Sapienza" University of Rome developed a modified version of RELAP5/Mod3.3, able to handle fundamental heat exchange phenomena involved in passive in-pool safety systems. A primary validation procedure has been performed for separated and integral effects. Dealing with nucleate boiling, the Root Mean Squared Relative Error (RMSRE) of wall superheat has been reduced from 1.290 to 0.182. Concerning film condensation, wall temperature RMSRE has been reduced from 0.192 to 0.058. The integral effect assessment has involved an experimental test of the PERSEO facility. The qualitative comparison between experiments and calculations has highlighted significant improvements of the modified RELAP5/Mod3.3.

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Section: Film Condensation In Vertical Tubesmentioning

confidence: 99%

Section: Film Condensation In Vertical Tubesmentioning

confidence: 99%