Analysis of the Critical Flow Model in TRAC-BF1 (NUREG/IA-0160)

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Publication Information

Date Published: May 1999

Prepared by:
M. Gómez, E. Valero, I. E. Parra

Department of Applied Mathematics and Statistics
Universidad Politécnica de Madrid

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
under the International Code Application and Maintenance Program (CAMP)

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Five Marviken Tests are modelled using TRAC-BF1. The code simulations are compared to Marviken data so as to analyse the capacity of TRAC-BF1 to reproduce subcooled and saturated blowdowns under critical conditions. Consequently, the critical flow model included in TRAC-BF1 will be validated.

Owing to the quasi-steady flow arising through the waste pipe, conserved quantities are useful to check the results accuracy. The influence of mesh refinement is also analysed.

Conclusions indicate that critical conditions must be imposed at the adequate sections to assure the calculations admissibility. However, the critical flow model introduces intrinsic errors that cannot be eliminated by means of mesh refinement.

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