The prediction of condensation in the presence of noncondensable gases has received continuing attention in the frame of the Severe Accident Research Network, both in the first (2004-2008) and in the second step (2009-2013) of its activities. Among the different reasons for considering so relevant this basic phenomenon, coped with by classical treatments dated in the first decades of the last century, there is the interest for developing updated CFD models for reactor containment analysis, requiring to validate at a different level the available modeling techniques. In the frame of both SARNET and SARNET-2, benchmarking activities were undertaken taking advantage of the work performed at different institutions in setting up and developing models for steam condensation in conditions of interest for nuclear reactor containment. Four steps were performed in the activity, involving: 1) an idealized problem freely inspired at the actual conditions occurring in an experimental facility, CONAN, installed at the University of Pisa; 2) a first comparison with experimental data purposely collected by the CONAN facility; 3) a second comparison with older data available from the previous experimental campaigns performed in the same apparatus; 4) a third exercise involving data obtained at lower mixture velocity than in previous campaigns, aimed at providing conditions closer to those addressed in reactor containment analyses. The last step of the benchmarking activity required to change the configuration of the experimental apparatus to achieve the lower flow rates involved in the new test specifications. The four benchmarking steps received the interest of several participants, who applied their models to the proposed blind exercises, receiving by the University of Pisa, as the hosting organization, comparisons with the reference data. Since the same geometry and relatively similar conditions were addressed in the four steps, though considering different operating regions, a gradual improvement of the quality of results was observed with respect to the first applications. The activity revealed to be fruitful in providing the needed awareness about the capabilities of condensation models, at least in the simple configuration involved by the benchmark exercises.

Comparison and Analysis of the Condensation Benchmark Results

AMBROSINI, WALTER;FORGIONE, NICOLA;ORIOLO, FRANCESCO;PACI, SANDRO
2013

Abstract

The prediction of condensation in the presence of noncondensable gases has received continuing attention in the frame of the Severe Accident Research Network, both in the first (2004-2008) and in the second step (2009-2013) of its activities. Among the different reasons for considering so relevant this basic phenomenon, coped with by classical treatments dated in the first decades of the last century, there is the interest for developing updated CFD models for reactor containment analysis, requiring to validate at a different level the available modeling techniques. In the frame of both SARNET and SARNET-2, benchmarking activities were undertaken taking advantage of the work performed at different institutions in setting up and developing models for steam condensation in conditions of interest for nuclear reactor containment. Four steps were performed in the activity, involving: 1) an idealized problem freely inspired at the actual conditions occurring in an experimental facility, CONAN, installed at the University of Pisa; 2) a first comparison with experimental data purposely collected by the CONAN facility; 3) a second comparison with older data available from the previous experimental campaigns performed in the same apparatus; 4) a third exercise involving data obtained at lower mixture velocity than in previous campaigns, aimed at providing conditions closer to those addressed in reactor containment analyses. The last step of the benchmarking activity required to change the configuration of the experimental apparatus to achieve the lower flow rates involved in the new test specifications. The four benchmarking steps received the interest of several participants, who applied their models to the proposed blind exercises, receiving by the University of Pisa, as the hosting organization, comparisons with the reference data. Since the same geometry and relatively similar conditions were addressed in the four steps, though considering different operating regions, a gradual improvement of the quality of results was observed with respect to the first applications. The activity revealed to be fruitful in providing the needed awareness about the capabilities of condensation models, at least in the simple configuration involved by the benchmark exercises.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/266939
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