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Modeling and Validation of a Mechanistic Tool (MEFISTO) for the Prediction of Critical Power in BWR Fuel Assemblies
Westinghouse Electric Sweden.
Westinghouse Electric Sweden.
2011 (English)In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 241, no 8, 2843-2858 p.Article in journal (Refereed) Published
Abstract [en]

Westinghouse is currently developing the MEFISTO code with the main goal to achieve fast, robust, practical and reliable prediction of steady-state dryout Critical Power in Boiling Water Reactor (BWR) fuel bundle based on a mechanistic approach. A computationally efficient simulation scheme was used to achieve this goal, where the code resolves all relevant field (drop, steam and multi-film) mass balance equations, within the annular flow region, at the sub-channel level while relying on a fast and robust two-phase (liquid/steam) sub-channel solution to provide the cross-flow information. The MEFISTO code can hence provide highly detailed solution of the multi-film flow in BWR fuel bundle while enhancing flexibility and reducing the computer time by an order of magnitude as compared to a standard three-field sub-channel analysis approach. Models for the numerical computation of the one-dimensional field flowrate distributions in an open channel (e.g. a sub-channel), including the numerical treatment of field cross-flows, part-length rods, spacers grids and post-dryout conditions are presented in this paper. The MEFISTO code is then applied to dryout prediction in BWR fuel bundle using VIPRE-W as a fast and robust two-phase sub-channel driver code. The dryout power is numerically predicted by iterating on the bundle power so that the minimum film flowrate in the bundle reaches the dryout criteria. Predicted dryout powers (including trends with flow, pressure, inlet subcooling and power distribution) and predicted dryout locations (both axial and radial) are compared to experimental results, using the entire Westinghouse SVEA-96 Optima3 dryout database, and are shown to yield excellent results.

Place, publisher, year, edition, pages
2011. Vol. 241, no 8, 2843-2858 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-13431DOI: 10.1016/j.nucengdes.2011.01.033ISI: 000294374600026OAI: oai:DiVA.org:kth-13431DiVA: diva2:325313
Note
QC 20120327. Updated from submitted to published.Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Dryout and Power Distribution Effects in Boiling Water Reactors
Open this publication in new window or tab >>Dryout and Power Distribution Effects in Boiling Water Reactors
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Film flow measurements at several axial positions in round pipes with variousaxial power distributions are presented for conditions corresponding to normaloperation of a BWR. It is confirmed that the film flow rate approaches zero atthe onset of dryout. Selected phenomenological models of annular two-phaseflow are shown to reasonably reproduce the measurements. It is concluded thatmodels are in better agreement with measurements if terms corresponding topossible boiling induced entrainment are excluded.

A method to perform film flow analysis in subchannels as a post-processto a standard two-field subchannel code is suggested. It is shown that thisapproach may yield accurate prediction of dryout power in rod bundles to alow computational cost and that the influence of the power distribution is wellpredicted by the model.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. x, 42 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:59
Keyword
Dryout, Film flow analysis, Power distribution, Measurements, Subchannel
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-11343 (URN)978-91-7415-481-8 (ISBN)
Public defence
2009-11-13, Sal FR4, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100618Available from: 2009-10-28 Created: 2009-10-28 Last updated: 2010-07-19Bibliographically approved

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